Merge tag 'rtc-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "Many cleanups and a few drivers removal this cycle.

  Subsystem:
   - Introduce features bitfield and the first feature: RTC_FEATURE_ALARM

  Removed drivers:
   - ab3100
   - coh901331
   - tx4939
   - sirfsoc

  Drivers:
   - use rtc_lock and rtc_unlock instead of opencoding
   - constify all struct rtc_class_ops
   - quiet maybe-unused variable warning
   - replace spin_lock_irqsave with spin_lock in hard IRQ
   - pcf2127: disable Power-On Reset Override and run OTP refresh"

* tag 'rtc-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (81 commits)
  rtc: abx80x: Add utility function for writing configuration key
  rtc: pcf2127: properly set flag WD_CD for rtc chips(pcf2129, pca2129)
  rtc: pcf8563: Add NXP PCA8565 compatible
  rtc: s3c: quiet maybe-unused variable warning
  rtc: s3c: stop setting bogus time
  rtc: sd3078: quiet maybe-unused variable warning
  rtc: s35390a: quiet maybe-unused variable warning
  rtc: rx8581: quiet maybe-unused variable warning
  rtc: rx8010: quiet maybe-unused variable warning
  rtc: rv8803: quiet maybe-unused variable warning
  rtc: rv3032: quiet maybe-unused variable warning
  rtc: rv3029: quiet maybe-unused variable warning
  rtc: rv3028: quiet maybe-unused variable warning
  rtc: rs5c372: quiet maybe-unused variable warning
  rtc: pcf85363: quiet maybe-unused variable warning
  rtc: pcf85063: quiet maybe-unused variable warnings
  rtc: meson: quiet maybe-unused variable warning
  rtc: m41t80: quiet maybe-unused variable warning
  rtc: isl1208: quiet maybe-unused variable warning
  rtc: ds3232: quiet maybe-unused variable warning
  ...

Documentation/devicetree/bindings/rtc/atmel,at91rm9200-rtc.yaml

@@ -20,6 +20,7 @@ properties:
       - atmel,sama5d4-rtc
       - atmel,sama5d2-rtc
       - microchip,sam9x60-rtc
+      - microchip,sama7g5-rtc
 
   reg:
     maxItems: 1

Documentation/devicetree/bindings/rtc/nxp,pcf2127.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/nxp,pcf2127.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP PCF2127 Real Time Clock
+
+allOf:
+  - $ref: "rtc.yaml#"
+
+maintainers:
+  - Alexandre Belloni <alexandre.belloni@bootlin.com>
+
+properties:
+  compatible:
+    const: nxp,pcf2127
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  start-year: true
+
+  reset-source: true
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        rtc@51 {
+            compatible = "nxp,pcf2127";
+            reg = <0x51>;
+            pinctrl-0 = <&rtc_nint_pins>;
+            interrupts-extended = <&gpio1 16 IRQ_TYPE_LEVEL_HIGH>;
+            reset-source;
+        };
+    };
+
+...

Documentation/devicetree/bindings/rtc/pcf8563.txt

@@ -5,7 +5,8 @@ Philips PCF8563/Epson RTC8564 Real Time Clock
 Required properties:
 - compatible: Should contain "nxp,pcf8563",
 	"epson,rtc8564" or
-	"microcrystal,rv8564"
+	"microcrystal,rv8564" or
+	"nxp,pca8565"
 - reg: I2C address for chip.
 
 Optional property:

Documentation/devicetree/bindings/rtc/sirf,prima2-sysrtc.txt

-SiRFSoC Real Time Clock
-
-Required properties:
-- compatible: must be "sirf,prima2-sysrtc"
-- reg: address range of rtc register set.
-- interrupts: rtc alarm interrupts.
-
-Example:
-	rtc@2000 {
-		compatible = "sirf,prima2-sysrtc";
-		reg = <0x2000 0x1000>;
-		interrupts = <52 53 54>;
-	};

Documentation/devicetree/bindings/rtc/stericsson,coh901331.txt

-ST-Ericsson COH 901 331 Real Time Clock
-
-Required properties:
-- compatible: must be "stericsson,coh901331"
-- reg: address range of rtc register set.
-- interrupts: rtc alarm interrupt.
-- clocks: phandle to the rtc clock source
-
-Example:
-	rtc: rtc@c0017000 {
-		compatible = "stericsson,coh901331";
-		reg = <0xc0017000 0x1000>;
-		interrupt-parent = <&vicb>;
-		interrupts = <10>;
-		clocks = <&rtc_clk>;
-	};

Documentation/devicetree/bindings/rtc/trivial-rtc.yaml

@@ -48,12 +48,8 @@ properties:
       - microcrystal,rv3029
       # Real Time Clock
       - microcrystal,rv8523
-      # Real-time clock
-      - nxp,pcf2127
-      # Real-time clock
-      - nxp,pcf2129
-      # Real-time clock
       - nxp,pca2129
+      - nxp,pcf2129
       # Real-time Clock Module
       - pericom,pt7c4338
       # I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC

drivers/rtc/Kconfig

@@ -692,6 +692,7 @@ config RTC_DRV_S5M
 	tristate "Samsung S2M/S5M series"
 	depends on MFD_SEC_CORE || COMPILE_TEST
 	select REGMAP_IRQ
+	select REGMAP_I2C
 	help
 	  If you say yes here you will get support for the
 	  RTC of Samsung S2MPS14 and S5M PMIC series.
@@ -1258,14 +1259,6 @@ config RTC_DRV_PCF50633
 	  If you say yes here you get support for the RTC subsystem of the
 	  NXP PCF50633 used in embedded systems.
 
-config RTC_DRV_AB3100
-	tristate "ST-Ericsson AB3100 RTC"
-	depends on AB3100_CORE
-	default y if AB3100_CORE
-	help
-	  Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC
-	  support. This chip contains a battery- and capacitor-backed RTC.
-
 config RTC_DRV_AB8500
 	tristate "ST-Ericsson AB8500 RTC"
 	depends on AB8500_CORE
@@ -1288,7 +1281,7 @@ config RTC_DRV_OPAL
 
 config RTC_DRV_ZYNQMP
 	tristate "Xilinx Zynq Ultrascale+ MPSoC RTC"
-	depends on OF
+	depends on OF && HAS_IOMEM
 	help
 	  If you say yes here you get support for the RTC controller found on
 	  Xilinx Zynq Ultrascale+ MPSoC.
@@ -1575,13 +1568,6 @@ config RTC_DRV_STARFIRE
 	  If you say Y here you will get support for the RTC found on
 	  Starfire systems.
 
-config RTC_DRV_TX4939
-	tristate "TX4939 SoC"
-	depends on SOC_TX4939 || COMPILE_TEST
-	help
-	  Driver for the internal RTC (Realtime Clock) module found on
-	  Toshiba TX4939 SoC.
-
 config RTC_DRV_MV
 	tristate "Marvell SoC RTC"
 	depends on ARCH_DOVE || ARCH_MVEBU || COMPILE_TEST
@@ -1596,6 +1582,7 @@ config RTC_DRV_MV
 config RTC_DRV_ARMADA38X
 	tristate "Armada 38x Marvell SoC RTC"
 	depends on ARCH_MVEBU || COMPILE_TEST
+	depends on OF
 	help
 	  If you say yes here you will get support for the in-chip RTC
 	  that can be found in the Armada 38x Marvell's SoC device
@@ -1633,18 +1620,6 @@ config RTC_DRV_PS3
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-ps3.
 
-config RTC_DRV_COH901331
-	tristate "ST-Ericsson COH 901 331 RTC"
-	depends on ARCH_U300 || COMPILE_TEST
-	help
-	  If you say Y here you will get access to ST-Ericsson
-	  COH 901 331 RTC clock found in some ST-Ericsson Mobile
-	  Platforms.
-
-	  This driver can also be built as a module. If so, the module
-	  will be called "rtc-coh901331".
-
-
 config RTC_DRV_STMP
 	tristate "Freescale STMP3xxx/i.MX23/i.MX28 RTC"
 	depends on ARCH_MXS || COMPILE_TEST
@@ -1787,13 +1762,6 @@ config RTC_DRV_IMX_SC
 	   If you say yes here you get support for the NXP i.MX System
 	   Controller RTC module.
 
-config RTC_DRV_SIRFSOC
-	tristate "SiRFSOC RTC"
-	depends on ARCH_SIRF
-	help
-	  Say "yes" here to support the real time clock on SiRF SOC chips.
-	  This driver can also be built as a module called rtc-sirfsoc.
-
 config RTC_DRV_ST_LPC
 	tristate "STMicroelectronics LPC RTC"
 	depends on ARCH_STI

drivers/rtc/Makefile

@@ -19,7 +19,6 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS)	+= sysfs.o
 
 obj-$(CONFIG_RTC_DRV_88PM80X)	+= rtc-88pm80x.o
 obj-$(CONFIG_RTC_DRV_88PM860X)	+= rtc-88pm860x.o
-obj-$(CONFIG_RTC_DRV_AB3100)	+= rtc-ab3100.o
 obj-$(CONFIG_RTC_DRV_AB8500)	+= rtc-ab8500.o
 obj-$(CONFIG_RTC_DRV_ABB5ZES3)	+= rtc-ab-b5ze-s3.o
 obj-$(CONFIG_RTC_DRV_ABEOZ9)	+= rtc-ab-eoz9.o
@@ -38,7 +37,6 @@ obj-$(CONFIG_RTC_DRV_BQ4802)	+= rtc-bq4802.o
 obj-$(CONFIG_RTC_DRV_BRCMSTB)	+= rtc-brcmstb-waketimer.o
 obj-$(CONFIG_RTC_DRV_CADENCE)	+= rtc-cadence.o
 obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc-cmos.o
-obj-$(CONFIG_RTC_DRV_COH901331)	+= rtc-coh901331.o
 obj-$(CONFIG_RTC_DRV_CPCAP)	+= rtc-cpcap.o
 obj-$(CONFIG_RTC_DRV_CROS_EC)	+= rtc-cros-ec.o
 obj-$(CONFIG_RTC_DRV_DA9052)	+= rtc-da9052.o
@@ -154,7 +152,6 @@ obj-$(CONFIG_RTC_DRV_SA1100)	+= rtc-sa1100.o
 obj-$(CONFIG_RTC_DRV_SC27XX)	+= rtc-sc27xx.o
 obj-$(CONFIG_RTC_DRV_SD3078)   += rtc-sd3078.o
 obj-$(CONFIG_RTC_DRV_SH)	+= rtc-sh.o
-obj-$(CONFIG_RTC_DRV_SIRFSOC)	+= rtc-sirfsoc.o
 obj-$(CONFIG_RTC_DRV_SNVS)	+= rtc-snvs.o
 obj-$(CONFIG_RTC_DRV_SPEAR)	+= rtc-spear.o
 obj-$(CONFIG_RTC_DRV_STARFIRE)	+= rtc-starfire.o
@@ -171,7 +168,6 @@ obj-$(CONFIG_RTC_DRV_TPS6586X)	+= rtc-tps6586x.o
 obj-$(CONFIG_RTC_DRV_TPS65910)	+= rtc-tps65910.o
 obj-$(CONFIG_RTC_DRV_TPS80031)	+= rtc-tps80031.o
 obj-$(CONFIG_RTC_DRV_TWL4030)	+= rtc-twl.o
-obj-$(CONFIG_RTC_DRV_TX4939)	+= rtc-tx4939.o
 obj-$(CONFIG_RTC_DRV_V3020)	+= rtc-v3020.o
 obj-$(CONFIG_RTC_DRV_VR41XX)	+= rtc-vr41xx.o
 obj-$(CONFIG_RTC_DRV_VT8500)	+= rtc-vt8500.o

drivers/rtc/class.c

@@ -231,6 +231,8 @@ static struct rtc_device *rtc_allocate_device(void)
 	rtc->pie_timer.function = rtc_pie_update_irq;
 	rtc->pie_enabled = 0;
 
+	set_bit(RTC_FEATURE_ALARM, rtc->features);
+
 	return rtc;
 }
 
@@ -322,11 +324,6 @@ static void rtc_device_get_offset(struct rtc_device *rtc)
 		rtc->offset_secs = 0;
 }
 
-/**
- * rtc_device_unregister - removes the previously registered RTC class device
- *
- * @rtc: the RTC class device to destroy
- */
 static void devm_rtc_unregister_device(void *data)
 {
 	struct rtc_device *rtc = data;
@@ -386,6 +383,9 @@ int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc)
 		return -EINVAL;
 	}
 
+	if (!rtc->ops->set_alarm)
+		clear_bit(RTC_FEATURE_ALARM, rtc->features);
+
 	rtc->owner = owner;
 	rtc_device_get_offset(rtc);
 

drivers/rtc/interface.c

@@ -186,7 +186,7 @@ static int rtc_read_alarm_internal(struct rtc_device *rtc,
 
 	if (!rtc->ops) {
 		err = -ENODEV;
-	} else if (!rtc->ops->read_alarm) {
+	} else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->read_alarm) {
 		err = -EINVAL;
 	} else {
 		alarm->enabled = 0;
@@ -392,7 +392,7 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
 		return err;
 	if (!rtc->ops) {
 		err = -ENODEV;
-	} else if (!rtc->ops->read_alarm) {
+	} else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->read_alarm) {
 		err = -EINVAL;
 	} else {
 		memset(alarm, 0, sizeof(struct rtc_wkalrm));
@@ -436,7 +436,7 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
 
 	if (!rtc->ops)
 		err = -ENODEV;
-	else if (!rtc->ops->set_alarm)
+	else if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
 		err = -EINVAL;
 	else
 		err = rtc->ops->set_alarm(rtc->dev.parent, alarm);
@@ -451,7 +451,7 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
 
 	if (!rtc->ops)
 		return -ENODEV;
-	else if (!rtc->ops->set_alarm)
+	else if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
 		return -EINVAL;
 
 	err = rtc_valid_tm(&alarm->time);
@@ -531,7 +531,7 @@ int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled)
 		/* nothing */;
 	else if (!rtc->ops)
 		err = -ENODEV;
-	else if (!rtc->ops->alarm_irq_enable)
+	else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->alarm_irq_enable)
 		err = -EINVAL;
 	else
 		err = rtc->ops->alarm_irq_enable(rtc->dev.parent, enabled);
@@ -843,7 +843,7 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)
 
 static void rtc_alarm_disable(struct rtc_device *rtc)
 {
-	if (!rtc->ops || !rtc->ops->alarm_irq_enable)
+	if (!rtc->ops || !test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->alarm_irq_enable)
 		return;
 
 	rtc->ops->alarm_irq_enable(rtc->dev.parent, false);

drivers/rtc/rtc-ab3100.c

-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2007-2009 ST-Ericsson AB
- * RTC clock driver for the AB3100 Analog Baseband Chip
- * Author: Linus Walleij <linus.walleij@stericsson.com>
- */
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/rtc.h>
-#include <linux/mfd/abx500.h>
-
-/* Clock rate in Hz */
-#define AB3100_RTC_CLOCK_RATE	32768
-
-/*
- * The AB3100 RTC registers. These are the same for
- * AB3000 and AB3100.
- * Control register:
- * Bit 0: RTC Monitor cleared=0, active=1, if you set it
- *        to 1 it remains active until RTC power is lost.
- * Bit 1: 32 kHz Oscillator, 0 = on, 1 = bypass
- * Bit 2: Alarm on, 0 = off, 1 = on
- * Bit 3: 32 kHz buffer disabling, 0 = enabled, 1 = disabled
- */
-#define AB3100_RTC		0x53
-/* default setting, buffer disabled, alarm on */
-#define RTC_SETTING		0x30
-/* Alarm when AL0-AL3 == TI0-TI3  */
-#define AB3100_AL0		0x56
-#define AB3100_AL1		0x57
-#define AB3100_AL2		0x58
-#define AB3100_AL3		0x59
-/* This 48-bit register that counts up at 32768 Hz */
-#define AB3100_TI0		0x5a
-#define AB3100_TI1		0x5b
-#define AB3100_TI2		0x5c
-#define AB3100_TI3		0x5d
-#define AB3100_TI4		0x5e
-#define AB3100_TI5		0x5f
-
-/*
- * RTC clock functions and device struct declaration
- */
-static int ab3100_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
-	u8 regs[] = {AB3100_TI0, AB3100_TI1, AB3100_TI2,
-		     AB3100_TI3, AB3100_TI4, AB3100_TI5};
-	unsigned char buf[6];
-	u64 hw_counter = rtc_tm_to_time64(tm) * AB3100_RTC_CLOCK_RATE * 2;
-	int err = 0;
-	int i;
-
-	buf[0] = (hw_counter) & 0xFF;
-	buf[1] = (hw_counter >> 8) & 0xFF;
-	buf[2] = (hw_counter >> 16) & 0xFF;
-	buf[3] = (hw_counter >> 24) & 0xFF;
-	buf[4] = (hw_counter >> 32) & 0xFF;
-	buf[5] = (hw_counter >> 40) & 0xFF;
-
-	for (i = 0; i < 6; i++) {
-		err = abx500_set_register_interruptible(dev, 0,
-							regs[i], buf[i]);
-		if (err)
-			return err;
-	}
-
-	/* Set the flag to mark that the clock is now set */
-	return abx500_mask_and_set_register_interruptible(dev, 0,
-							  AB3100_RTC,
-							  0x01, 0x01);
-
-}
-
-static int ab3100_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
-	time64_t time;
-	u8 rtcval;
-	int err;
-
-	err = abx500_get_register_interruptible(dev, 0,
-						AB3100_RTC, &rtcval);
-	if (err)
-		return err;
-
-	if (!(rtcval & 0x01)) {
-		dev_info(dev, "clock not set (lost power)");
-		return -EINVAL;
-	} else {
-		u64 hw_counter;
-		u8 buf[6];
-
-		/* Read out time registers */
-		err = abx500_get_register_page_interruptible(dev, 0,
-							     AB3100_TI0,
-							     buf, 6);
-		if (err != 0)
-			return err;
-
-		hw_counter = ((u64) buf[5] << 40) | ((u64) buf[4] << 32) |
-			((u64) buf[3] << 24) | ((u64) buf[2] << 16) |
-			((u64) buf[1] << 8) | (u64) buf[0];
-		time = hw_counter / (u64) (AB3100_RTC_CLOCK_RATE * 2);
-	}
-
-	rtc_time64_to_tm(time, tm);
-
-	return 0;
-}
-
-static int ab3100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
-{
-	time64_t time;
-	u64 hw_counter;
-	u8 buf[6];
-	u8 rtcval;
-	int err;
-
-	/* Figure out if alarm is enabled or not */
-	err = abx500_get_register_interruptible(dev, 0,
-						AB3100_RTC, &rtcval);
-	if (err)
-		return err;
-	if (rtcval & 0x04)
-		alarm->enabled = 1;
-	else
-		alarm->enabled = 0;
-	/* No idea how this could be represented */
-	alarm->pending = 0;
-	/* Read out alarm registers, only 4 bytes */
-	err = abx500_get_register_page_interruptible(dev, 0,
-						     AB3100_AL0, buf, 4);
-	if (err)
-		return err;
-	hw_counter = ((u64) buf[3] << 40) | ((u64) buf[2] << 32) |
-		((u64) buf[1] << 24) | ((u64) buf[0] << 16);
-	time = hw_counter / (u64) (AB3100_RTC_CLOCK_RATE * 2);
-
-	rtc_time64_to_tm(time, &alarm->time);
-
-	return rtc_valid_tm(&alarm->time);
-}
-
-static int ab3100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
-{
-	u8 regs[] = {AB3100_AL0, AB3100_AL1, AB3100_AL2, AB3100_AL3};
-	unsigned char buf[4];
-	time64_t secs;
-	u64 hw_counter;
-	int err;
-	int i;
-
-	secs = rtc_tm_to_time64(&alarm->time);
-	hw_counter = secs * AB3100_RTC_CLOCK_RATE * 2;
-	buf[0] = (hw_counter >> 16) & 0xFF;
-	buf[1] = (hw_counter >> 24) & 0xFF;
-	buf[2] = (hw_counter >> 32) & 0xFF;
-	buf[3] = (hw_counter >> 40) & 0xFF;
-
-	/* Set the alarm */
-	for (i = 0; i < 4; i++) {
-		err = abx500_set_register_interruptible(dev, 0,
-							regs[i], buf[i]);
-		if (err)
-			return err;
-	}
-	/* Then enable the alarm */
-	return abx500_mask_and_set_register_interruptible(dev, 0,
-							  AB3100_RTC, (1 << 2),
-							  alarm->enabled << 2);
-}
-
-static int ab3100_rtc_irq_enable(struct device *dev, unsigned int enabled)
-{
-	/*
-	 * It's not possible to enable/disable the alarm IRQ for this RTC.
-	 * It does not actually trigger any IRQ: instead its only function is
-	 * to power up the system, if it wasn't on. This will manifest as
-	 * a "power up cause" in the AB3100 power driver (battery charging etc)
-	 * and need to be handled there instead.
-	 */
-	if (enabled)
-		return abx500_mask_and_set_register_interruptible(dev, 0,
-						    AB3100_RTC, (1 << 2),
-						    1 << 2);
-	else
-		return abx500_mask_and_set_register_interruptible(dev, 0,
-						    AB3100_RTC, (1 << 2),
-						    0);
-}
-
-static const struct rtc_class_ops ab3100_rtc_ops = {
-	.read_time	= ab3100_rtc_read_time,
-	.set_time	= ab3100_rtc_set_time,
-	.read_alarm	= ab3100_rtc_read_alarm,
-	.set_alarm	= ab3100_rtc_set_alarm,
-	.alarm_irq_enable = ab3100_rtc_irq_enable,
-};
-
-static int __init ab3100_rtc_probe(struct platform_device *pdev)
-{
-	int err;
-	u8 regval;
-	struct rtc_device *rtc;
-
-	/* The first RTC register needs special treatment */
-	err = abx500_get_register_interruptible(&pdev->dev, 0,
-						AB3100_RTC, &regval);
-	if (err) {
-		dev_err(&pdev->dev, "unable to read RTC register\n");
-		return -ENODEV;
-	}
-
-	if ((regval & 0xFE) != RTC_SETTING) {
-		dev_warn(&pdev->dev, "not default value in RTC reg 0x%x\n",
-			 regval);
-	}
-
-	if ((regval & 1) == 0) {
-		/*
-		 * Set bit to detect power loss.
-		 * This bit remains until RTC power is lost.
-		 */
-		regval = 1 | RTC_SETTING;
-		err = abx500_set_register_interruptible(&pdev->dev, 0,
-							AB3100_RTC, regval);
-		/* Ignore any error on this write */
-	}
-
-	rtc = devm_rtc_allocate_device(&pdev->dev);
-	if (IS_ERR(rtc))
-		return PTR_ERR(rtc);
-
-	rtc->ops = &ab3100_rtc_ops;
-	/* 48bit counter at (AB3100_RTC_CLOCK_RATE * 2) */
-	rtc->range_max = U32_MAX;
-
-	platform_set_drvdata(pdev, rtc);
-
-	return devm_rtc_register_device(rtc);
-}
-
-static struct platform_driver ab3100_rtc_driver = {
-	.driver = {
-		.name = "ab3100-rtc",
-	},
-};
-
-module_platform_driver_probe(ab3100_rtc_driver, ab3100_rtc_probe);
-
-MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
-MODULE_DESCRIPTION("AB3100 RTC Driver");
-MODULE_LICENSE("GPL");

drivers/rtc/rtc-abx80x.c

@@ -117,6 +117,16 @@ struct abx80x_priv {
 	struct watchdog_device wdog;
 };
 
+static int abx80x_write_config_key(struct i2c_client *client, u8 key)
+{
+	if (i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, key) < 0) {
+		dev_err(&client->dev, "Unable to write configuration key\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
 static int abx80x_is_rc_mode(struct i2c_client *client)
 {
 	int flags = 0;
@@ -140,12 +150,8 @@ static int abx80x_enable_trickle_charger(struct i2c_client *client,
 	 * Write the configuration key register to enable access to the Trickle
 	 * register
 	 */
-	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
-					ABX8XX_CFG_KEY_MISC);
-	if (err < 0) {
-		dev_err(&client->dev, "Unable to write configuration key\n");
+	if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_MISC) < 0)
 		return -EIO;
-	}
 
 	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
 					ABX8XX_TRICKLE_CHARGE_ENABLE |
@@ -358,12 +364,8 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
 	}
 
 	/* Unlock write access to Oscillator Control Register */
-	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
-					   ABX8XX_CFG_KEY_OSC);
-	if (retval < 0) {
-		dev_err(dev, "Failed to write CONFIG_KEY register\n");
-		return retval;
-	}
+	if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_OSC) < 0)
+		return -EIO;
 
 	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
 
@@ -450,12 +452,8 @@ static ssize_t oscillator_store(struct device *dev,
 		flags |= (ABX8XX_OSC_OSEL);
 
 	/* Unlock write access on Oscillator Control register */
-	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
-					   ABX8XX_CFG_KEY_OSC);
-	if (retval < 0) {
-		dev_err(dev, "Failed to write CONFIG_KEY register\n");
-		return retval;
-	}
+	if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_OSC) < 0)
+		return -EIO;
 
 	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
 	if (retval < 0) {
@@ -762,13 +760,8 @@ static int abx80x_probe(struct i2c_client *client,
 		 * Write the configuration key register to enable access to
 		 * the config2 register
 		 */
-		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
-						ABX8XX_CFG_KEY_MISC);
-		if (err < 0) {
-			dev_err(&client->dev,
-				"Unable to write configuration key\n");
+		if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_MISC) < 0)
 			return -EIO;
-		}
 
 		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OUT_CTRL,
 						data | ABX8XX_OUT_CTRL_EXDS);

drivers/rtc/rtc-ac100.c

@@ -528,7 +528,7 @@ static irqreturn_t ac100_rtc_irq(int irq, void *data)
 	unsigned int val = 0;
 	int ret;
 
-	mutex_lock(&chip->rtc->ops_lock);
+	rtc_lock(chip->rtc);
 
 	/* read status */
 	ret = regmap_read(regmap, AC100_ALM_INT_STA, &val);
@@ -551,7 +551,7 @@ static irqreturn_t ac100_rtc_irq(int irq, void *data)
 	}
 
 out:
-	mutex_unlock(&chip->rtc->ops_lock);
+	rtc_unlock(chip->rtc);
 	return IRQ_HANDLED;
 }
 

drivers/rtc/rtc-armada38x.c

@@ -458,14 +458,6 @@ static const struct rtc_class_ops armada38x_rtc_ops = {
 	.set_offset = armada38x_rtc_set_offset,
 };
 
-static const struct rtc_class_ops armada38x_rtc_ops_noirq = {
-	.read_time = armada38x_rtc_read_time,
-	.set_time = armada38x_rtc_set_time,
-	.read_alarm = armada38x_rtc_read_alarm,
-	.read_offset = armada38x_rtc_read_offset,
-	.set_offset = armada38x_rtc_set_offset,
-};
-
 static const struct armada38x_rtc_data armada38x_data = {
 	.update_mbus_timing = rtc_update_38x_mbus_timing_params,
 	.read_rtc_reg = read_rtc_register_38x_wa,
@@ -540,20 +532,15 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev)
 	}
 	platform_set_drvdata(pdev, rtc);
 
-	if (rtc->irq != -1) {
+	if (rtc->irq != -1)
 		device_init_wakeup(&pdev->dev, 1);
-		rtc->rtc_dev->ops = &armada38x_rtc_ops;
-	} else {
-		/*
-		 * If there is no interrupt available then we can't
-		 * use the alarm
-		 */
-		rtc->rtc_dev->ops = &armada38x_rtc_ops_noirq;
-	}
+	else
+		clear_bit(RTC_FEATURE_ALARM, rtc->rtc_dev->features);
 
 	/* Update RTC-MBUS bridge timing parameters */
 	rtc->data->update_mbus_timing(rtc);
 
+	rtc->rtc_dev->ops = &armada38x_rtc_ops;
 	rtc->rtc_dev->range_max = U32_MAX;
 
 	return devm_rtc_register_device(rtc->rtc_dev);

drivers/rtc/rtc-asm9260.c

@@ -116,15 +116,15 @@ static irqreturn_t asm9260_rtc_irq(int irq, void *dev_id)
 	u32 isr;
 	unsigned long events = 0;
 
-	mutex_lock(&priv->rtc->ops_lock);
+	rtc_lock(priv->rtc);
 	isr = ioread32(priv->iobase + HW_CIIR);
 	if (!isr) {
-		mutex_unlock(&priv->rtc->ops_lock);
+		rtc_unlock(priv->rtc);
 		return IRQ_NONE;
 	}
 
 	iowrite32(0, priv->iobase + HW_CIIR);
-	mutex_unlock(&priv->rtc->ops_lock);
+	rtc_unlock(priv->rtc);
 
 	events |= RTC_AF | RTC_IRQF;
 

drivers/rtc/rtc-bq32k.c

@@ -311,7 +311,7 @@ static const struct i2c_device_id bq32k_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, bq32k_id);
 
-static const struct of_device_id bq32k_of_match[] = {
+static const __maybe_unused struct of_device_id bq32k_of_match[] = {
 	{ .compatible = "ti,bq32000" },
 	{ }
 };

drivers/rtc/rtc-brcmstb-waketimer.c

@@ -306,7 +306,7 @@ static int brcmstb_waketmr_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(brcmstb_waketmr_pm_ops,
 			 brcmstb_waketmr_suspend, brcmstb_waketmr_resume);
 
-static const struct of_device_id brcmstb_waketmr_of_match[] = {
+static const __maybe_unused struct of_device_id brcmstb_waketmr_of_match[] = {
 	{ .compatible = "brcm,brcmstb-waketimer" },
 	{ /* sentinel */ },
 };

drivers/rtc/rtc-cmos.c

@@ -574,12 +574,6 @@ static const struct rtc_class_ops cmos_rtc_ops = {
 	.alarm_irq_enable	= cmos_alarm_irq_enable,
 };
 
-static const struct rtc_class_ops cmos_rtc_ops_no_alarm = {
-	.read_time		= cmos_read_time,
-	.set_time		= cmos_set_time,
-	.proc			= cmos_procfs,
-};
-
 /*----------------------------------------------------------------*/
 
 /*
@@ -649,11 +643,10 @@ static struct cmos_rtc	cmos_rtc;
 
 static irqreturn_t cmos_interrupt(int irq, void *p)
 {
-	unsigned long	flags;
 	u8		irqstat;
 	u8		rtc_control;
 
-	spin_lock_irqsave(&rtc_lock, flags);
+	spin_lock(&rtc_lock);
 
 	/* When the HPET interrupt handler calls us, the interrupt
 	 * status is passed as arg1 instead of the irq number.  But
@@ -687,7 +680,7 @@ static irqreturn_t cmos_interrupt(int irq, void *p)
 			hpet_mask_rtc_irq_bit(RTC_AIE);
 		CMOS_READ(RTC_INTR_FLAGS);
 	}
-	spin_unlock_irqrestore(&rtc_lock, flags);
+	spin_unlock(&rtc_lock);
 
 	if (is_intr(irqstat)) {
 		rtc_update_irq(p, 1, irqstat);
@@ -865,12 +858,12 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
 			dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
 			goto cleanup1;
 		}
-
-		cmos_rtc.rtc->ops = &cmos_rtc_ops;
 	} else {
-		cmos_rtc.rtc->ops = &cmos_rtc_ops_no_alarm;
+		clear_bit(RTC_FEATURE_ALARM, cmos_rtc.rtc->features);
 	}
 
+	cmos_rtc.rtc->ops = &cmos_rtc_ops;
+
 	retval = devm_rtc_register_device(cmos_rtc.rtc);
 	if (retval)
 		goto cleanup2;

drivers/rtc/rtc-coh901331.c

-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2007-2009 ST-Ericsson AB
- * Real Time Clock interface for ST-Ericsson AB COH 901 331 RTC.
- * Author: Linus Walleij <linus.walleij@stericsson.com>
- * Based on rtc-pl031.c by Deepak Saxena <dsaxena@plexity.net>
- * Copyright 2006 (c) MontaVista Software, Inc.
- */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/mod_devicetable.h>
-#include <linux/rtc.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/pm.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-
-/*
- * Registers in the COH 901 331
- */
-/* Alarm value 32bit (R/W) */
-#define COH901331_ALARM		0x00U
-/* Used to set current time 32bit (R/W) */
-#define COH901331_SET_TIME	0x04U
-/* Indication if current time is valid 32bit (R/-) */
-#define COH901331_VALID		0x08U
-/* Read the current time 32bit (R/-) */
-#define COH901331_CUR_TIME	0x0cU
-/* Event register for the "alarm" interrupt */
-#define COH901331_IRQ_EVENT	0x10U
-/* Mask register for the "alarm" interrupt */
-#define COH901331_IRQ_MASK	0x14U
-/* Force register for the "alarm" interrupt */
-#define COH901331_IRQ_FORCE	0x18U
-
-/*
- * Reference to RTC block clock
- * Notice that the frequent clk_enable()/clk_disable() on this
- * clock is mainly to be able to turn on/off other clocks in the
- * hierarchy as needed, the RTC clock is always on anyway.
- */
-struct coh901331_port {
-	struct rtc_device *rtc;
-	struct clk *clk;
-	void __iomem *virtbase;
-	int irq;
-#ifdef CONFIG_PM_SLEEP
-	u32 irqmaskstore;
-#endif
-};
-
-static irqreturn_t coh901331_interrupt(int irq, void *data)
-{
-	struct coh901331_port *rtap = data;
-
-	clk_enable(rtap->clk);
-	/* Ack IRQ */
-	writel(1, rtap->virtbase + COH901331_IRQ_EVENT);
-	/*
-	 * Disable the interrupt. This is necessary because
-	 * the RTC lives on a lower-clocked line and will
-	 * not release the IRQ line until after a few (slower)
-	 * clock cycles. The interrupt will be re-enabled when
-	 * a new alarm is set anyway.
-	 */
-	writel(0, rtap->virtbase + COH901331_IRQ_MASK);
-	clk_disable(rtap->clk);
-
-	/* Set alarm flag */
-	rtc_update_irq(rtap->rtc, 1, RTC_AF);
-
-	return IRQ_HANDLED;
-}
-
-static int coh901331_read_time(struct device *dev, struct rtc_time *tm)
-{
-	struct coh901331_port *rtap = dev_get_drvdata(dev);
-
-	clk_enable(rtap->clk);
-	/* Check if the time is valid */
-	if (!readl(rtap->virtbase + COH901331_VALID)) {
-		clk_disable(rtap->clk);
-		return -EINVAL;
-	}
-
-	rtc_time64_to_tm(readl(rtap->virtbase + COH901331_CUR_TIME), tm);
-	clk_disable(rtap->clk);
-	return 0;
-}
-
-static int coh901331_set_time(struct device *dev, struct rtc_time *tm)
-{
-	struct coh901331_port *rtap = dev_get_drvdata(dev);
-
-	clk_enable(rtap->clk);
-	writel(rtc_tm_to_time64(tm), rtap->virtbase + COH901331_SET_TIME);
-	clk_disable(rtap->clk);
-
-	return 0;
-}
-
-static int coh901331_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
-{
-	struct coh901331_port *rtap = dev_get_drvdata(dev);
-
-	clk_enable(rtap->clk);
-	rtc_time64_to_tm(readl(rtap->virtbase + COH901331_ALARM), &alarm->time);
-	alarm->pending = readl(rtap->virtbase + COH901331_IRQ_EVENT) & 1U;
-	alarm->enabled = readl(rtap->virtbase + COH901331_IRQ_MASK) & 1U;
-	clk_disable(rtap->clk);
-
-	return 0;
-}
-
-static int coh901331_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
-{
-	struct coh901331_port *rtap = dev_get_drvdata(dev);
-	unsigned long time =  rtc_tm_to_time64(&alarm->time);
-
-	clk_enable(rtap->clk);
-	writel(time, rtap->virtbase + COH901331_ALARM);
-	writel(alarm->enabled, rtap->virtbase + COH901331_IRQ_MASK);
-	clk_disable(rtap->clk);
-
-	return 0;
-}
-
-static int coh901331_alarm_irq_enable(struct device *dev, unsigned int enabled)
-{
-	struct coh901331_port *rtap = dev_get_drvdata(dev);
-
-	clk_enable(rtap->clk);
-	if (enabled)
-		writel(1, rtap->virtbase + COH901331_IRQ_MASK);
-	else
-		writel(0, rtap->virtbase + COH901331_IRQ_MASK);
-	clk_disable(rtap->clk);
-
-	return 0;
-}
-
-static const struct rtc_class_ops coh901331_ops = {
-	.read_time = coh901331_read_time,
-	.set_time = coh901331_set_time,
-	.read_alarm = coh901331_read_alarm,
-	.set_alarm = coh901331_set_alarm,
-	.alarm_irq_enable = coh901331_alarm_irq_enable,
-};
-
-static int __exit coh901331_remove(struct platform_device *pdev)
-{
-	struct coh901331_port *rtap = platform_get_drvdata(pdev);
-
-	if (rtap)
-		clk_unprepare(rtap->clk);
-
-	return 0;
-}
-
-
-static int __init coh901331_probe(struct platform_device *pdev)
-{
-	int ret;
-	struct coh901331_port *rtap;
-
-	rtap = devm_kzalloc(&pdev->dev,
-			    sizeof(struct coh901331_port), GFP_KERNEL);
-	if (!rtap)
-		return -ENOMEM;
-
-	rtap->virtbase  = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(rtap->virtbase))
-		return PTR_ERR(rtap->virtbase);
-
-	rtap->irq = platform_get_irq(pdev, 0);
-	if (devm_request_irq(&pdev->dev, rtap->irq, coh901331_interrupt, 0,
-			     "RTC COH 901 331 Alarm", rtap))
-		return -EIO;
-
-	rtap->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(rtap->clk)) {
-		ret = PTR_ERR(rtap->clk);
-		dev_err(&pdev->dev, "could not get clock\n");
-		return ret;
-	}
-
-	rtap->rtc = devm_rtc_allocate_device(&pdev->dev);
-	if (IS_ERR(rtap->rtc))
-		return PTR_ERR(rtap->rtc);
-
-	rtap->rtc->ops = &coh901331_ops;
-	rtap->rtc->range_max = U32_MAX;
-
-	/* We enable/disable the clock only to assure it works */
-	ret = clk_prepare_enable(rtap->clk);
-	if (ret) {
-		dev_err(&pdev->dev, "could not enable clock\n");
-		return ret;
-	}
-	clk_disable(rtap->clk);
-
-	platform_set_drvdata(pdev, rtap);
-
-	ret = devm_rtc_register_device(rtap->rtc);
-	if (ret)
-		goto out_no_rtc;
-
-	return 0;
-
- out_no_rtc:
-	clk_unprepare(rtap->clk);
-	return ret;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int coh901331_suspend(struct device *dev)
-{
-	struct coh901331_port *rtap = dev_get_drvdata(dev);
-
-	/*
-	 * If this RTC alarm will be used for waking the system up,
-	 * don't disable it of course. Else we just disable the alarm
-	 * and await suspension.
-	 */
-	if (device_may_wakeup(dev)) {
-		enable_irq_wake(rtap->irq);
-	} else {
-		clk_enable(rtap->clk);
-		rtap->irqmaskstore = readl(rtap->virtbase + COH901331_IRQ_MASK);
-		writel(0, rtap->virtbase + COH901331_IRQ_MASK);
-		clk_disable(rtap->clk);
-	}
-	clk_unprepare(rtap->clk);
-	return 0;
-}
-
-static int coh901331_resume(struct device *dev)
-{
-	int ret;
-	struct coh901331_port *rtap = dev_get_drvdata(dev);
-
-	ret = clk_prepare(rtap->clk);
-	if (ret)
-		return ret;
-
-	if (device_may_wakeup(dev)) {
-		disable_irq_wake(rtap->irq);
-	} else {
-		clk_enable(rtap->clk);
-		writel(rtap->irqmaskstore, rtap->virtbase + COH901331_IRQ_MASK);
-		clk_disable(rtap->clk);
-	}
-	return 0;
-}
-#endif
-
-static SIMPLE_DEV_PM_OPS(coh901331_pm_ops, coh901331_suspend, coh901331_resume);
-
-static void coh901331_shutdown(struct platform_device *pdev)
-{
-	struct coh901331_port *rtap = platform_get_drvdata(pdev);
-
-	clk_enable(rtap->clk);
-	writel(0, rtap->virtbase + COH901331_IRQ_MASK);
-	clk_disable_unprepare(rtap->clk);
-}
-
-static const struct of_device_id coh901331_dt_match[] = {
-	{ .compatible = "stericsson,coh901331" },
-	{},
-};
-MODULE_DEVICE_TABLE(of, coh901331_dt_match);
-
-static struct platform_driver coh901331_driver = {
-	.driver = {
-		.name = "rtc-coh901331",
-		.pm = &coh901331_pm_ops,
-		.of_match_table = coh901331_dt_match,
-	},
-	.remove = __exit_p(coh901331_remove),
-	.shutdown = coh901331_shutdown,
-};
-
-module_platform_driver_probe(coh901331_driver, coh901331_probe);
-
-MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
-MODULE_DESCRIPTION("ST-Ericsson AB COH 901 331 RTC Driver");
-MODULE_LICENSE("GPL");

drivers/rtc/rtc-digicolor.c

@@ -205,7 +205,7 @@ static int __init dc_rtc_probe(struct platform_device *pdev)
 	return devm_rtc_register_device(rtc->rtc_dev);
 }
 
-static const struct of_device_id dc_dt_ids[] = {
+static const __maybe_unused struct of_device_id dc_dt_ids[] = {
 	{ .compatible = "cnxt,cx92755-rtc" },
 	{ /* sentinel */ }
 };

drivers/rtc/rtc-ds1305.c

@@ -435,13 +435,12 @@ static const struct rtc_class_ops ds1305_ops = {
 static void ds1305_work(struct work_struct *work)
 {
 	struct ds1305	*ds1305 = container_of(work, struct ds1305, work);
-	struct mutex	*lock = &ds1305->rtc->ops_lock;
 	struct spi_device *spi = ds1305->spi;
 	u8		buf[3];
 	int		status;
 
 	/* lock to protect ds1305->ctrl */
-	mutex_lock(lock);
+	rtc_lock(ds1305->rtc);
 
 	/* Disable the IRQ, and clear its status ... for now, we "know"
 	 * that if more than one alarm is active, they're in sync.
@@ -459,7 +458,7 @@ static void ds1305_work(struct work_struct *work)
 	if (status < 0)
 		dev_dbg(&spi->dev, "clear irq --> %d\n", status);
 
-	mutex_unlock(lock);
+	rtc_unlock(ds1305->rtc);
 
 	if (!test_bit(FLAG_EXITING, &ds1305->flags))
 		enable_irq(spi->irq);

drivers/rtc/rtc-ds1307.c

@@ -558,11 +558,10 @@ static u8 do_trickle_setup_rx8130(struct ds1307 *ds1307, u32 ohms, bool diode)
 static irqreturn_t rx8130_irq(int irq, void *dev_id)
 {
 	struct ds1307           *ds1307 = dev_id;
-	struct mutex            *lock = &ds1307->rtc->ops_lock;
 	u8 ctl[3];
 	int ret;
 
-	mutex_lock(lock);
+	rtc_lock(ds1307->rtc);
 
 	/* Read control registers. */
 	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
@@ -582,7 +581,7 @@ static irqreturn_t rx8130_irq(int irq, void *dev_id)
 	rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
 
 out:
-	mutex_unlock(lock);
+	rtc_unlock(ds1307->rtc);
 
 	return IRQ_HANDLED;
 }

drivers/rtc/rtc-ds1672.c

@@ -139,7 +139,7 @@ static const struct i2c_device_id ds1672_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, ds1672_id);
 
-static const struct of_device_id ds1672_of_match[] = {
+static const __maybe_unused struct of_device_id ds1672_of_match[] = {
 	{ .compatible = "dallas,ds1672" },
 	{ }
 };

drivers/rtc/rtc-ds1685.c

@@ -658,7 +658,6 @@ ds1685_rtc_irq_handler(int irq, void *dev_id)
 {
 	struct platform_device *pdev = dev_id;
 	struct ds1685_priv *rtc = platform_get_drvdata(pdev);
-	struct mutex *rtc_mutex;
 	u8 ctrlb, ctrlc;
 	unsigned long events = 0;
 	u8 num_irqs = 0;
@@ -667,8 +666,7 @@ ds1685_rtc_irq_handler(int irq, void *dev_id)
 	if (unlikely(!rtc))
 		return IRQ_HANDLED;
 
-	rtc_mutex = &rtc->dev->ops_lock;
-	mutex_lock(rtc_mutex);
+	rtc_lock(rtc->dev);
 
 	/* Ctrlb holds the interrupt-enable bits and ctrlc the flag bits. */
 	ctrlb = rtc->read(rtc, RTC_CTRL_B);
@@ -713,7 +711,7 @@ ds1685_rtc_irq_handler(int irq, void *dev_id)
 		}
 	}
 	rtc_update_irq(rtc->dev, num_irqs, events);
-	mutex_unlock(rtc_mutex);
+	rtc_unlock(rtc->dev);
 
 	return events ? IRQ_HANDLED : IRQ_NONE;
 }

drivers/rtc/rtc-ds3232.c

@@ -406,11 +406,10 @@ static irqreturn_t ds3232_irq(int irq, void *dev_id)
 {
 	struct device *dev = dev_id;
 	struct ds3232 *ds3232 = dev_get_drvdata(dev);
-	struct mutex *lock = &ds3232->rtc->ops_lock;
 	int ret;
 	int stat, control;
 
-	mutex_lock(lock);
+	rtc_lock(ds3232->rtc);
 
 	ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
 	if (ret)
@@ -448,7 +447,7 @@ static irqreturn_t ds3232_irq(int irq, void *dev_id)
 	}
 
 unlock:
-	mutex_unlock(lock);
+	rtc_unlock(ds3232->rtc);
 
 	return IRQ_HANDLED;
 }
@@ -593,7 +592,7 @@ static const struct i2c_device_id ds3232_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, ds3232_id);
 
-static const struct of_device_id ds3232_of_match[] = {
+static const  __maybe_unused struct of_device_id ds3232_of_match[] = {
 	{ .compatible = "dallas,ds3232" },
 	{ }
 };

drivers/rtc/rtc-hym8563.c

@@ -428,10 +428,9 @@ static irqreturn_t hym8563_irq(int irq, void *dev_id)
 {
 	struct hym8563 *hym8563 = (struct hym8563 *)dev_id;
 	struct i2c_client *client = hym8563->client;
-	struct mutex *lock = &hym8563->rtc->ops_lock;
 	int data, ret;
 
-	mutex_lock(lock);
+	rtc_lock(hym8563->rtc);
 
 	/* Clear the alarm flag */
 
@@ -451,7 +450,7 @@ static irqreturn_t hym8563_irq(int irq, void *dev_id)
 	}
 
 out:
-	mutex_unlock(lock);
+	rtc_unlock(hym8563->rtc);
 	return IRQ_HANDLED;
 }
 

drivers/rtc/rtc-isl1208.c

@@ -99,7 +99,7 @@ static const struct i2c_device_id isl1208_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, isl1208_id);
 
-static const struct of_device_id isl1208_of_match[] = {
+static const __maybe_unused struct of_device_id isl1208_of_match[] = {
 	{ .compatible = "isil,isl1208", .data = &isl1208_configs[TYPE_ISL1208] },
 	{ .compatible = "isil,isl1209", .data = &isl1208_configs[TYPE_ISL1209] },
 	{ .compatible = "isil,isl1218", .data = &isl1208_configs[TYPE_ISL1218] },

drivers/rtc/rtc-m41t80.c

@@ -85,7 +85,7 @@ static const struct i2c_device_id m41t80_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, m41t80_id);
 
-static const struct of_device_id m41t80_of_match[] = {
+static const __maybe_unused struct of_device_id m41t80_of_match[] = {
 	{
 		.compatible = "st,m41t62",
 		.data = (void *)(M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT)
@@ -158,21 +158,20 @@ static irqreturn_t m41t80_handle_irq(int irq, void *dev_id)
 {
 	struct i2c_client *client = dev_id;
 	struct m41t80_data *m41t80 = i2c_get_clientdata(client);
-	struct mutex *lock = &m41t80->rtc->ops_lock;
 	unsigned long events = 0;
 	int flags, flags_afe;
 
-	mutex_lock(lock);
+	rtc_lock(m41t80->rtc);
 
 	flags_afe = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
 	if (flags_afe < 0) {
-		mutex_unlock(lock);
+		rtc_unlock(m41t80->rtc);
 		return IRQ_NONE;
 	}
 
 	flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
 	if (flags <= 0) {
-		mutex_unlock(lock);
+		rtc_unlock(m41t80->rtc);
 		return IRQ_NONE;
 	}
 
@@ -189,7 +188,7 @@ static irqreturn_t m41t80_handle_irq(int irq, void *dev_id)
 					  flags_afe);
 	}
 
-	mutex_unlock(lock);
+	rtc_unlock(m41t80->rtc);
 
 	return IRQ_HANDLED;
 }
@@ -397,10 +396,13 @@ static int m41t80_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	return 0;
 }
 
-static struct rtc_class_ops m41t80_rtc_ops = {
+static const struct rtc_class_ops m41t80_rtc_ops = {
 	.read_time = m41t80_rtc_read_time,
 	.set_time = m41t80_rtc_set_time,
 	.proc = m41t80_rtc_proc,
+	.read_alarm = m41t80_read_alarm,
+	.set_alarm = m41t80_set_alarm,
+	.alarm_irq_enable = m41t80_alarm_irq_enable,
 };
 
 #ifdef CONFIG_PM_SLEEP
@@ -913,13 +915,10 @@ static int m41t80_probe(struct i2c_client *client,
 			wakeup_source = false;
 		}
 	}
-	if (client->irq > 0 || wakeup_source) {
-		m41t80_rtc_ops.read_alarm = m41t80_read_alarm;
-		m41t80_rtc_ops.set_alarm = m41t80_set_alarm;
-		m41t80_rtc_ops.alarm_irq_enable = m41t80_alarm_irq_enable;
-		/* Enable the wakealarm */
+	if (client->irq > 0 || wakeup_source)
 		device_init_wakeup(&client->dev, true);
-	}
+	else
+		clear_bit(RTC_FEATURE_ALARM, m41t80_data->rtc->features);
 
 	m41t80_data->rtc->ops = &m41t80_rtc_ops;
 	m41t80_data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;

drivers/rtc/rtc-m48t59.c

@@ -313,11 +313,6 @@ static const struct rtc_class_ops m48t59_rtc_ops = {
 	.alarm_irq_enable = m48t59_rtc_alarm_irq_enable,
 };
 
-static const struct rtc_class_ops m48t02_rtc_ops = {
-	.read_time	= m48t59_rtc_read_time,
-	.set_time	= m48t59_rtc_set_time,
-};
-
 static int m48t59_nvram_read(void *priv, unsigned int offset, void *val,
 			     size_t size)
 {
@@ -366,7 +361,6 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
 	struct m48t59_private *m48t59 = NULL;
 	struct resource *res;
 	int ret = -ENOMEM;
-	const struct rtc_class_ops *ops;
 	struct nvmem_config nvmem_cfg = {
 		.name = "m48t59-",
 		.word_size = 1,
@@ -438,17 +432,21 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
 		if (ret)
 			return ret;
 	}
+
+	m48t59->rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(m48t59->rtc))
+		return PTR_ERR(m48t59->rtc);
+
 	switch (pdata->type) {
 	case M48T59RTC_TYPE_M48T59:
-		ops = &m48t59_rtc_ops;
 		pdata->offset = 0x1ff0;
 		break;
 	case M48T59RTC_TYPE_M48T02:
-		ops = &m48t02_rtc_ops;
+		clear_bit(RTC_FEATURE_ALARM, m48t59->rtc->features);
 		pdata->offset = 0x7f0;
 		break;
 	case M48T59RTC_TYPE_M48T08:
-		ops = &m48t02_rtc_ops;
+		clear_bit(RTC_FEATURE_ALARM, m48t59->rtc->features);
 		pdata->offset = 0x1ff0;
 		break;
 	default:
@@ -459,11 +457,7 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
 	spin_lock_init(&m48t59->lock);
 	platform_set_drvdata(pdev, m48t59);
 
-	m48t59->rtc = devm_rtc_allocate_device(&pdev->dev);
-	if (IS_ERR(m48t59->rtc))
-		return PTR_ERR(m48t59->rtc);
-
-	m48t59->rtc->ops = ops;
+	m48t59->rtc->ops = &m48t59_rtc_ops;
 
 	nvmem_cfg.size = pdata->offset;
 	ret = devm_rtc_nvmem_register(m48t59->rtc, &nvmem_cfg);

drivers/rtc/rtc-mcp795.c

@@ -350,10 +350,9 @@ static irqreturn_t mcp795_irq(int irq, void *data)
 {
 	struct spi_device *spi = data;
 	struct rtc_device *rtc = spi_get_drvdata(spi);
-	struct mutex *lock = &rtc->ops_lock;
 	int ret;
 
-	mutex_lock(lock);
+	rtc_lock(rtc);
 
 	/* Disable alarm.
 	 * There is no need to clear ALM0IF (Alarm 0 Interrupt Flag) bit,
@@ -365,7 +364,7 @@ static irqreturn_t mcp795_irq(int irq, void *data)
 			"Failed to disable alarm in IRQ (ret=%d)\n", ret);
 	rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
 
-	mutex_unlock(lock);
+	rtc_unlock(rtc);
 
 	return IRQ_HANDLED;
 }

drivers/rtc/rtc-meson.c

@@ -380,7 +380,7 @@ static int meson_rtc_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static const struct of_device_id meson_rtc_dt_match[] = {
+static const __maybe_unused struct of_device_id meson_rtc_dt_match[] = {
 	{ .compatible = "amlogic,meson6-rtc", },
 	{ .compatible = "amlogic,meson8-rtc", },
 	{ .compatible = "amlogic,meson8b-rtc", },

drivers/rtc/rtc-mv.c

@@ -200,11 +200,6 @@ static irqreturn_t mv_rtc_interrupt(int irq, void *data)
 static const struct rtc_class_ops mv_rtc_ops = {
 	.read_time	= mv_rtc_read_time,
 	.set_time	= mv_rtc_set_time,
-};
-
-static const struct rtc_class_ops mv_rtc_alarm_ops = {
-	.read_time	= mv_rtc_read_time,
-	.set_time	= mv_rtc_set_time,
 	.read_alarm	= mv_rtc_read_alarm,
 	.set_alarm	= mv_rtc_set_alarm,
 	.alarm_irq_enable = mv_rtc_alarm_irq_enable,
@@ -268,13 +263,12 @@ static int __init mv_rtc_probe(struct platform_device *pdev)
 		}
 	}
 
-	if (pdata->irq >= 0) {
+	if (pdata->irq >= 0)
 		device_init_wakeup(&pdev->dev, 1);
-		pdata->rtc->ops = &mv_rtc_alarm_ops;
-	} else {
-		pdata->rtc->ops = &mv_rtc_ops;
-	}
+	else
+		clear_bit(RTC_FEATURE_ALARM, pdata->rtc->features);
 
+	pdata->rtc->ops = &mv_rtc_ops;
 	pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	pdata->rtc->range_max = RTC_TIMESTAMP_END_2099;
 

drivers/rtc/rtc-mxc.c

@@ -189,11 +189,10 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
 	struct platform_device *pdev = dev_id;
 	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
 	void __iomem *ioaddr = pdata->ioaddr;
-	unsigned long flags;
 	u32 status;
 	u32 events = 0;
 
-	spin_lock_irqsave(&pdata->rtc->irq_lock, flags);
+	spin_lock(&pdata->rtc->irq_lock);
 	status = readw(ioaddr + RTC_RTCISR) & readw(ioaddr + RTC_RTCIENR);
 	/* clear interrupt sources */
 	writew(status, ioaddr + RTC_RTCISR);
@@ -209,7 +208,7 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
 		events |= (RTC_PF | RTC_IRQF);
 
 	rtc_update_irq(pdata->rtc, 1, events);
-	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);
+	spin_unlock(&pdata->rtc->irq_lock);
 
 	return IRQ_HANDLED;
 }

drivers/rtc/rtc-mxc_v2.c

@@ -74,13 +74,12 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
 	struct device *dev = dev_id;
 	struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr;
-	unsigned long flags;
 	u32 lp_status;
 	u32 lp_cr;
 
-	spin_lock_irqsave(&pdata->lock, flags);
+	spin_lock(&pdata->lock);
 	if (clk_enable(pdata->clk)) {
-		spin_unlock_irqrestore(&pdata->lock, flags);
+		spin_unlock(&pdata->lock);
 		return IRQ_NONE;
 	}
 
@@ -104,7 +103,7 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
 
 	mxc_rtc_sync_lp_locked(dev, ioaddr);
 	clk_disable(pdata->clk);
-	spin_unlock_irqrestore(&pdata->lock, flags);
+	spin_unlock(&pdata->lock);
 	return IRQ_HANDLED;
 }
 

drivers/rtc/rtc-opal.c

@@ -224,32 +224,35 @@ static int opal_tpo_alarm_irq_enable(struct device *dev, unsigned int enabled)
 	return enabled ? 0 : opal_set_tpo_time(dev, &alarm);
 }
 
-static struct rtc_class_ops opal_rtc_ops = {
+static const struct rtc_class_ops opal_rtc_ops = {
 	.read_time	= opal_get_rtc_time,
 	.set_time	= opal_set_rtc_time,
+	.read_alarm	= opal_get_tpo_time,
+	.set_alarm	= opal_set_tpo_time,
+	.alarm_irq_enable = opal_tpo_alarm_irq_enable,
 };
 
 static int opal_rtc_probe(struct platform_device *pdev)
 {
 	struct rtc_device *rtc;
 
+	rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+
 	if (pdev->dev.of_node &&
 	    (of_property_read_bool(pdev->dev.of_node, "wakeup-source") ||
-	     of_property_read_bool(pdev->dev.of_node, "has-tpo")/* legacy */)) {
+	     of_property_read_bool(pdev->dev.of_node, "has-tpo")/* legacy */))
 		device_set_wakeup_capable(&pdev->dev, true);
-		opal_rtc_ops.read_alarm	= opal_get_tpo_time;
-		opal_rtc_ops.set_alarm = opal_set_tpo_time;
-		opal_rtc_ops.alarm_irq_enable = opal_tpo_alarm_irq_enable;
-	}
-
-	rtc = devm_rtc_device_register(&pdev->dev, DRVNAME, &opal_rtc_ops,
-				       THIS_MODULE);
-	if (IS_ERR(rtc))
-		return PTR_ERR(rtc);
+	else
+		clear_bit(RTC_FEATURE_ALARM, rtc->features);
 
+	rtc->ops = &opal_rtc_ops;
+	rtc->range_min = RTC_TIMESTAMP_BEGIN_0000;
+	rtc->range_max = RTC_TIMESTAMP_END_9999;
 	rtc->uie_unsupported = 1;
 
-	return 0;
+	return devm_rtc_register_device(rtc);
 }
 
 static const struct of_device_id opal_rtc_match[] = {

drivers/rtc/rtc-pcf2123.c

@@ -307,11 +307,10 @@ static int pcf2123_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 static irqreturn_t pcf2123_rtc_irq(int irq, void *dev)
 {
 	struct pcf2123_data *pcf2123 = dev_get_drvdata(dev);
-	struct mutex *lock = &pcf2123->rtc->ops_lock;
 	unsigned int val = 0;
 	int ret = IRQ_NONE;
 
-	mutex_lock(lock);
+	rtc_lock(pcf2123->rtc);
 	regmap_read(pcf2123->map, PCF2123_REG_CTRL2, &val);
 
 	/* Alarm? */
@@ -324,7 +323,7 @@ static irqreturn_t pcf2123_rtc_irq(int irq, void *dev)
 		rtc_update_irq(pcf2123->rtc, 1, RTC_IRQF | RTC_AF);
 	}
 
-	mutex_unlock(lock);
+	rtc_unlock(pcf2123->rtc);
 
 	return ret;
 }

drivers/rtc/rtc-pcf2127.c

@@ -26,6 +26,7 @@
 
 /* Control register 1 */
 #define PCF2127_REG_CTRL1		0x00
+#define PCF2127_BIT_CTRL1_POR_OVRD		BIT(3)
 #define PCF2127_BIT_CTRL1_TSF1			BIT(4)
 /* Control register 2 */
 #define PCF2127_REG_CTRL2		0x01
@@ -57,6 +58,9 @@
 #define PCF2127_REG_ALARM_DM		0x0D
 #define PCF2127_REG_ALARM_DW		0x0E
 #define PCF2127_BIT_ALARM_AE			BIT(7)
+/* CLKOUT control register */
+#define PCF2127_REG_CLKOUT		0x0f
+#define PCF2127_BIT_CLKOUT_OTPR			BIT(5)
 /* Watchdog registers */
 #define PCF2127_REG_WD_CTL		0x10
 #define PCF2127_BIT_WD_CTL_TF0			BIT(0)
@@ -225,12 +229,6 @@ static int pcf2127_rtc_ioctl(struct device *dev,
 	}
 }
 
-static const struct rtc_class_ops pcf2127_rtc_ops = {
-	.ioctl		= pcf2127_rtc_ioctl,
-	.read_time	= pcf2127_rtc_read_time,
-	.set_time	= pcf2127_rtc_set_time,
-};
-
 static int pcf2127_nvmem_read(void *priv, unsigned int offset,
 			      void *val, size_t bytes)
 {
@@ -459,7 +457,7 @@ static irqreturn_t pcf2127_rtc_irq(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-static const struct rtc_class_ops pcf2127_rtc_alrm_ops = {
+static const struct rtc_class_ops pcf2127_rtc_ops = {
 	.ioctl            = pcf2127_rtc_ioctl,
 	.read_time        = pcf2127_rtc_read_time,
 	.set_time         = pcf2127_rtc_set_time,
@@ -560,10 +558,11 @@ static const struct attribute_group pcf2127_attr_group = {
 };
 
 static int pcf2127_probe(struct device *dev, struct regmap *regmap,
-			 int alarm_irq, const char *name, bool has_nvmem)
+			 int alarm_irq, const char *name, bool is_pcf2127)
 {
 	struct pcf2127 *pcf2127;
 	int ret = 0;
+	unsigned int val;
 
 	dev_dbg(dev, "%s\n", __func__);
 
@@ -584,6 +583,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
 	pcf2127->rtc->range_max = RTC_TIMESTAMP_END_2099;
 	pcf2127->rtc->set_start_time = true; /* Sets actual start to 1970 */
 	pcf2127->rtc->uie_unsupported = 1;
+	clear_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
 
 	if (alarm_irq > 0) {
 		ret = devm_request_threaded_irq(dev, alarm_irq, NULL,
@@ -598,10 +598,10 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
 
 	if (alarm_irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
 		device_init_wakeup(dev, true);
-		pcf2127->rtc->ops = &pcf2127_rtc_alrm_ops;
+		set_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
 	}
 
-	if (has_nvmem) {
+	if (is_pcf2127) {
 		struct nvmem_config nvmem_cfg = {
 			.priv = pcf2127,
 			.reg_read = pcf2127_nvmem_read,
@@ -612,10 +612,34 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
 		ret = devm_rtc_nvmem_register(pcf2127->rtc, &nvmem_cfg);
 	}
 
+	/*
+	 * The "Power-On Reset Override" facility prevents the RTC to do a reset
+	 * after power on. For normal operation the PORO must be disabled.
+	 */
+	regmap_clear_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
+				PCF2127_BIT_CTRL1_POR_OVRD);
+
+	ret = regmap_read(pcf2127->regmap, PCF2127_REG_CLKOUT, &val);
+	if (ret < 0)
+		return ret;
+
+	if (!(val & PCF2127_BIT_CLKOUT_OTPR)) {
+		ret = regmap_set_bits(pcf2127->regmap, PCF2127_REG_CLKOUT,
+				      PCF2127_BIT_CLKOUT_OTPR);
+		if (ret < 0)
+			return ret;
+
+		msleep(100);
+	}
+
 	/*
 	 * Watchdog timer enabled and reset pin /RST activated when timed out.
 	 * Select 1Hz clock source for watchdog timer.
 	 * Note: Countdown timer disabled and not available.
+	 * For pca2129, pcf2129, only bit[7] is for Symbol WD_CD
+	 * of register watchdg_tim_ctl. The bit[6] is labeled
+	 * as T. Bits labeled as T must always be written with
+	 * logic 0.
 	 */
 	ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
 				 PCF2127_BIT_WD_CTL_CD1 |
@@ -623,7 +647,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
 				 PCF2127_BIT_WD_CTL_TF1 |
 				 PCF2127_BIT_WD_CTL_TF0,
 				 PCF2127_BIT_WD_CTL_CD1 |
-				 PCF2127_BIT_WD_CTL_CD0 |
+				 (is_pcf2127 ? PCF2127_BIT_WD_CTL_CD0 : 0) |
 				 PCF2127_BIT_WD_CTL_TF1);
 	if (ret) {
 		dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__);

drivers/rtc/rtc-pcf85063.c

@@ -307,14 +307,6 @@ static int pcf85063_ioctl(struct device *dev, unsigned int cmd,
 }
 
 static const struct rtc_class_ops pcf85063_rtc_ops = {
-	.read_time	= pcf85063_rtc_read_time,
-	.set_time	= pcf85063_rtc_set_time,
-	.read_offset	= pcf85063_read_offset,
-	.set_offset	= pcf85063_set_offset,
-	.ioctl		= pcf85063_ioctl,
-};
-
-static const struct rtc_class_ops pcf85063_rtc_ops_alarm = {
 	.read_time	= pcf85063_rtc_read_time,
 	.set_time	= pcf85063_rtc_set_time,
 	.read_offset	= pcf85063_read_offset,
@@ -509,15 +501,6 @@ static struct clk *pcf85063_clkout_register_clk(struct pcf85063 *pcf85063)
 }
 #endif
 
-static const struct pcf85063_config pcf85063a_config = {
-	.regmap = {
-		.reg_bits = 8,
-		.val_bits = 8,
-		.max_register = 0x11,
-	},
-	.has_alarms = 1,
-};
-
 static const struct pcf85063_config pcf85063tp_config = {
 	.regmap = {
 		.reg_bits = 8,
@@ -526,16 +509,6 @@ static const struct pcf85063_config pcf85063tp_config = {
 	},
 };
 
-static const struct pcf85063_config rv8263_config = {
-	.regmap = {
-		.reg_bits = 8,
-		.val_bits = 8,
-		.max_register = 0x11,
-	},
-	.has_alarms = 1,
-	.force_cap_7000 = 1,
-};
-
 static int pcf85063_probe(struct i2c_client *client)
 {
 	struct pcf85063 *pcf85063;
@@ -587,6 +560,7 @@ static int pcf85063_probe(struct i2c_client *client)
 	pcf85063->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	pcf85063->rtc->range_max = RTC_TIMESTAMP_END_2099;
 	pcf85063->rtc->uie_unsupported = 1;
+	clear_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
 
 	if (config->has_alarms && client->irq > 0) {
 		err = devm_request_threaded_irq(&client->dev, client->irq,
@@ -597,7 +571,7 @@ static int pcf85063_probe(struct i2c_client *client)
 			dev_warn(&pcf85063->rtc->dev,
 				 "unable to request IRQ, alarms disabled\n");
 		} else {
-			pcf85063->rtc->ops = &pcf85063_rtc_ops_alarm;
+			set_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
 			device_init_wakeup(&client->dev, true);
 			err = dev_pm_set_wake_irq(&client->dev, client->irq);
 			if (err)
@@ -618,6 +592,25 @@ static int pcf85063_probe(struct i2c_client *client)
 }
 
 #ifdef CONFIG_OF
+static const struct pcf85063_config pcf85063a_config = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x11,
+	},
+	.has_alarms = 1,
+};
+
+static const struct pcf85063_config rv8263_config = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x11,
+	},
+	.has_alarms = 1,
+	.force_cap_7000 = 1,
+};
+
 static const struct of_device_id pcf85063_of_match[] = {
 	{ .compatible = "nxp,pcf85063", .data = &pcf85063tp_config },
 	{ .compatible = "nxp,pcf85063tp", .data = &pcf85063tp_config },

drivers/rtc/rtc-pcf85363.c

@@ -285,11 +285,6 @@ static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id)
 static const struct rtc_class_ops rtc_ops = {
 	.read_time	= pcf85363_rtc_read_time,
 	.set_time	= pcf85363_rtc_set_time,
-};
-
-static const struct rtc_class_ops rtc_ops_alarm = {
-	.read_time	= pcf85363_rtc_read_time,
-	.set_time	= pcf85363_rtc_set_time,
 	.read_alarm	= pcf85363_rtc_read_alarm,
 	.set_alarm	= pcf85363_rtc_set_alarm,
 	.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable,
@@ -403,6 +398,7 @@ static int pcf85363_probe(struct i2c_client *client,
 	pcf85363->rtc->ops = &rtc_ops;
 	pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	pcf85363->rtc->range_max = RTC_TIMESTAMP_END_2099;
+	clear_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
 
 	if (client->irq > 0) {
 		regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
@@ -415,7 +411,7 @@ static int pcf85363_probe(struct i2c_client *client,
 		if (ret)
 			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 		else
-			pcf85363->rtc->ops = &rtc_ops_alarm;
+			set_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
 	}
 
 	ret = devm_rtc_register_device(pcf85363->rtc);
@@ -428,7 +424,7 @@ static int pcf85363_probe(struct i2c_client *client,
 	return ret;
 }
 
-static const struct of_device_id dev_ids[] = {
+static const __maybe_unused struct of_device_id dev_ids[] = {
 	{ .compatible = "nxp,pcf85263", .data = &pcf_85263_config },
 	{ .compatible = "nxp,pcf85363", .data = &pcf_85363_config },
 	{ /* sentinel */ }

drivers/rtc/rtc-pcf8563.c

@@ -597,6 +597,7 @@ static int pcf8563_probe(struct i2c_client *client,
 static const struct i2c_device_id pcf8563_id[] = {
 	{ "pcf8563", 0 },
 	{ "rtc8564", 0 },
+	{ "pca8565", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, pcf8563_id);
@@ -606,6 +607,7 @@ static const struct of_device_id pcf8563_of_match[] = {
 	{ .compatible = "nxp,pcf8563" },
 	{ .compatible = "epson,rtc8564" },
 	{ .compatible = "microcrystal,rv8564" },
+	{ .compatible = "nxp,pca8565" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, pcf8563_of_match);

drivers/rtc/rtc-pl031.c

@@ -352,12 +352,8 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
 		}
 	}
 
-	if (!adev->irq[0]) {
-		/* When there's no interrupt, no point in exposing the alarm */
-		ops->read_alarm = NULL;
-		ops->set_alarm = NULL;
-		ops->alarm_irq_enable = NULL;
-	}
+	if (!adev->irq[0])
+		clear_bit(RTC_FEATURE_ALARM, ldata->rtc->features);
 
 	device_init_wakeup(&adev->dev, true);
 	ldata->rtc = devm_rtc_allocate_device(&adev->dev);

drivers/rtc/rtc-pm8xxx.c

@@ -20,6 +20,7 @@
 /* RTC_CTRL register bit fields */
 #define PM8xxx_RTC_ENABLE		BIT(7)
 #define PM8xxx_RTC_ALARM_CLEAR		BIT(0)
+#define PM8xxx_RTC_ALARM_ENABLE		BIT(7)
 
 #define NUM_8_BIT_RTC_REGS		0x4
 
@@ -265,6 +266,7 @@ static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 {
 	int rc;
+	unsigned int ctrl_reg;
 	u8 value[NUM_8_BIT_RTC_REGS];
 	unsigned long secs;
 	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
@@ -282,6 +284,13 @@ static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 
 	rtc_time64_to_tm(secs, &alarm->time);
 
+	rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
+	if (rc) {
+		dev_err(dev, "Read from RTC alarm control register failed\n");
+		return rc;
+	}
+	alarm->enabled = !!(ctrl_reg & PM8xxx_RTC_ALARM_ENABLE);
+
 	dev_dbg(dev, "Alarm set for - h:m:s=%ptRt, y-m-d=%ptRdr\n",
 		&alarm->time, &alarm->time);
 
@@ -343,16 +352,15 @@ static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
 	const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
 	unsigned int ctrl_reg;
 	int rc;
-	unsigned long irq_flags;
 
 	rtc_update_irq(rtc_dd->rtc, 1, RTC_IRQF | RTC_AF);
 
-	spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
+	spin_lock(&rtc_dd->ctrl_reg_lock);
 
 	/* Clear the alarm enable bit */
 	rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
 	if (rc) {
-		spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
+		spin_unlock(&rtc_dd->ctrl_reg_lock);
 		goto rtc_alarm_handled;
 	}
 
@@ -360,13 +368,13 @@ static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
 
 	rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
 	if (rc) {
-		spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
+		spin_unlock(&rtc_dd->ctrl_reg_lock);
 		dev_err(rtc_dd->rtc_dev,
 			"Write to alarm control register failed\n");
 		goto rtc_alarm_handled;
 	}
 
-	spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
+	spin_unlock(&rtc_dd->ctrl_reg_lock);
 
 	/* Clear RTC alarm register */
 	rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl2, &ctrl_reg);

drivers/rtc/rtc-r7301.c

@@ -320,11 +320,10 @@ static irqreturn_t rtc7301_irq_handler(int irq, void *dev_id)
 {
 	struct rtc_device *rtc = dev_id;
 	struct rtc7301_priv *priv = dev_get_drvdata(rtc->dev.parent);
-	unsigned long flags;
 	irqreturn_t ret = IRQ_NONE;
 	u8 alrm_ctrl;
 
-	spin_lock_irqsave(&priv->lock, flags);
+	spin_lock(&priv->lock);
 
 	rtc7301_select_bank(priv, 1);
 
@@ -335,7 +334,7 @@ static irqreturn_t rtc7301_irq_handler(int irq, void *dev_id)
 		rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
 	}
 
-	spin_unlock_irqrestore(&priv->lock, flags);
+	spin_unlock(&priv->lock);
 
 	return ret;
 }

drivers/rtc/rtc-rs5c372.c

@@ -83,7 +83,7 @@ static const struct i2c_device_id rs5c372_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rs5c372_id);
 
-static const struct of_device_id rs5c372_of_match[] = {
+static const __maybe_unused struct of_device_id rs5c372_of_match[] = {
 	{
 		.compatible = "ricoh,r2025sd",
 		.data = (void *)rtc_r2025sd

drivers/rtc/rtc-rv3028.c

@@ -265,8 +265,7 @@ static irqreturn_t rv3028_handle_irq(int irq, void *dev_id)
 		return IRQ_NONE;
 	}
 
-	if (status & RV3028_STATUS_PORF)
-		dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n");
+	status &= ~RV3028_STATUS_PORF;
 
 	if (status & RV3028_STATUS_TF) {
 		status |= RV3028_STATUS_TF;
@@ -311,10 +310,8 @@ static int rv3028_get_time(struct device *dev, struct rtc_time *tm)
 	if (ret < 0)
 		return ret;
 
-	if (status & RV3028_STATUS_PORF) {
-		dev_warn(dev, "Voltage low, data is invalid.\n");
+	if (status & RV3028_STATUS_PORF)
 		return -EINVAL;
-	}
 
 	ret = regmap_bulk_read(rv3028->regmap, RV3028_SEC, date, sizeof(date));
 	if (ret)
@@ -770,9 +767,12 @@ static int rv3028_clkout_register_clk(struct rv3028_data *rv3028,
 }
 #endif
 
-static struct rtc_class_ops rv3028_rtc_ops = {
+static const struct rtc_class_ops rv3028_rtc_ops = {
 	.read_time = rv3028_get_time,
 	.set_time = rv3028_set_time,
+	.read_alarm = rv3028_get_alarm,
+	.set_alarm = rv3028_set_alarm,
+	.alarm_irq_enable = rv3028_alarm_irq_enable,
 	.read_offset = rv3028_read_offset,
 	.set_offset = rv3028_set_offset,
 	.ioctl = rv3028_ioctl,
@@ -823,9 +823,6 @@ static int rv3028_probe(struct i2c_client *client)
 	if (ret < 0)
 		return ret;
 
-	if (status & RV3028_STATUS_PORF)
-		dev_warn(&client->dev, "Voltage low, data loss detected.\n");
-
 	if (status & RV3028_STATUS_AF)
 		dev_warn(&client->dev, "An alarm may have been missed.\n");
 
@@ -841,12 +838,10 @@ static int rv3028_probe(struct i2c_client *client)
 		if (ret) {
 			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 			client->irq = 0;
-		} else {
-			rv3028_rtc_ops.read_alarm = rv3028_get_alarm;
-			rv3028_rtc_ops.set_alarm = rv3028_set_alarm;
-			rv3028_rtc_ops.alarm_irq_enable = rv3028_alarm_irq_enable;
 		}
 	}
+	if (!client->irq)
+		clear_bit(RTC_FEATURE_ALARM, rv3028->rtc->features);
 
 	ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1,
 				 RV3028_CTRL1_WADA, RV3028_CTRL1_WADA);
@@ -903,7 +898,7 @@ static int rv3028_probe(struct i2c_client *client)
 	return 0;
 }
 
-static const struct of_device_id rv3028_of_match[] = {
+static const __maybe_unused struct of_device_id rv3028_of_match[] = {
 	{ .compatible = "microcrystal,rv3028", },
 	{ }
 };

drivers/rtc/rtc-rv3029c2.c

@@ -265,24 +265,23 @@ static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
 {
 	struct device *dev = dev_id;
 	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
-	struct mutex *lock = &rv3029->rtc->ops_lock;
 	unsigned int flags, controls;
 	unsigned long events = 0;
 	int ret;
 
-	mutex_lock(lock);
+	rtc_lock(rv3029->rtc);
 
 	ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
 	if (ret) {
 		dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
-		mutex_unlock(lock);
+		rtc_unlock(rv3029->rtc);
 		return IRQ_NONE;
 	}
 
 	ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
 	if (ret) {
 		dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
-		mutex_unlock(lock);
+		rtc_unlock(rv3029->rtc);
 		return IRQ_NONE;
 	}
 
@@ -297,7 +296,7 @@ static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
 		regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags);
 		regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls);
 	}
-	mutex_unlock(lock);
+	rtc_unlock(rv3029->rtc);
 
 	return IRQ_HANDLED;
 }
@@ -694,10 +693,13 @@ static void rv3029_hwmon_register(struct device *dev, const char *name)
 
 #endif /* CONFIG_RTC_DRV_RV3029_HWMON */
 
-static struct rtc_class_ops rv3029_rtc_ops = {
+static const struct rtc_class_ops rv3029_rtc_ops = {
 	.read_time	= rv3029_read_time,
 	.set_time	= rv3029_set_time,
 	.ioctl		= rv3029_ioctl,
+	.read_alarm	= rv3029_read_alarm,
+	.set_alarm	= rv3029_set_alarm,
+	.alarm_irq_enable = rv3029_alarm_irq_enable,
 };
 
 static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
@@ -739,12 +741,10 @@ static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
 		if (rc) {
 			dev_warn(dev, "unable to request IRQ, alarms disabled\n");
 			rv3029->irq = 0;
-		} else {
-			rv3029_rtc_ops.read_alarm = rv3029_read_alarm;
-			rv3029_rtc_ops.set_alarm = rv3029_set_alarm;
-			rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable;
 		}
 	}
+	if (!rv3029->irq)
+		clear_bit(RTC_FEATURE_ALARM, rv3029->rtc->features);
 
 	rv3029->rtc->ops = &rv3029_rtc_ops;
 	rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
@@ -808,7 +808,7 @@ static const struct i2c_device_id rv3029_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rv3029_id);
 
-static const struct of_device_id rv3029_of_match[] = {
+static const __maybe_unused struct of_device_id rv3029_of_match[] = {
 	{ .compatible = "microcrystal,rv3029" },
 	{ }
 };

drivers/rtc/rtc-rv3032.c

@@ -804,12 +804,15 @@ static void rv3032_hwmon_register(struct device *dev)
 	devm_hwmon_device_register_with_info(dev, "rv3032", rv3032, &rv3032_hwmon_chip_info, NULL);
 }
 
-static struct rtc_class_ops rv3032_rtc_ops = {
+static const struct rtc_class_ops rv3032_rtc_ops = {
 	.read_time = rv3032_get_time,
 	.set_time = rv3032_set_time,
 	.read_offset = rv3032_read_offset,
 	.set_offset = rv3032_set_offset,
 	.ioctl = rv3032_ioctl,
+	.read_alarm = rv3032_get_alarm,
+	.set_alarm = rv3032_set_alarm,
+	.alarm_irq_enable = rv3032_alarm_irq_enable,
 };
 
 static const struct regmap_config regmap_config = {
@@ -868,12 +871,10 @@ static int rv3032_probe(struct i2c_client *client)
 		if (ret) {
 			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 			client->irq = 0;
-		} else {
-			rv3032_rtc_ops.read_alarm = rv3032_get_alarm;
-			rv3032_rtc_ops.set_alarm = rv3032_set_alarm;
-			rv3032_rtc_ops.alarm_irq_enable = rv3032_alarm_irq_enable;
 		}
 	}
+	if (!client->irq)
+		clear_bit(RTC_FEATURE_ALARM, rv3032->rtc->features);
 
 	ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL1,
 				 RV3032_CTRL1_WADA, RV3032_CTRL1_WADA);
@@ -905,7 +906,7 @@ static int rv3032_probe(struct i2c_client *client)
 	return 0;
 }
 
-static const struct of_device_id rv3032_of_match[] = {
+static const __maybe_unused struct of_device_id rv3032_of_match[] = {
 	{ .compatible = "microcrystal,rv3032", },
 	{ }
 };

drivers/rtc/rtc-rv8803.c

@@ -471,10 +471,13 @@ static int rv8803_nvram_read(void *priv, unsigned int offset,
 	return 0;
 }
 
-static struct rtc_class_ops rv8803_rtc_ops = {
+static const struct rtc_class_ops rv8803_rtc_ops = {
 	.read_time = rv8803_get_time,
 	.set_time = rv8803_set_time,
 	.ioctl = rv8803_ioctl,
+	.read_alarm = rv8803_get_alarm,
+	.set_alarm = rv8803_set_alarm,
+	.alarm_irq_enable = rv8803_alarm_irq_enable,
 };
 
 static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
@@ -567,12 +570,10 @@ static int rv8803_probe(struct i2c_client *client,
 		if (err) {
 			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 			client->irq = 0;
-		} else {
-			rv8803_rtc_ops.read_alarm = rv8803_get_alarm;
-			rv8803_rtc_ops.set_alarm = rv8803_set_alarm;
-			rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable;
 		}
 	}
+	if (!client->irq)
+		clear_bit(RTC_FEATURE_ALARM, rv8803->rtc->features);
 
 	err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
 	if (err)
@@ -606,7 +607,7 @@ static const struct i2c_device_id rv8803_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rv8803_id);
 
-static const struct of_device_id rv8803_of_match[] = {
+static const __maybe_unused struct of_device_id rv8803_of_match[] = {
 	{
 		.compatible = "microcrystal,rv8803",
 		.data = (void *)rv_8803

drivers/rtc/rtc-rx6110.c

@@ -331,7 +331,7 @@ static int rx6110_probe(struct rx6110_data *rx6110, struct device *dev)
 	return 0;
 }
 
-#ifdef CONFIG_SPI_MASTER
+#if IS_ENABLED(CONFIG_SPI_MASTER)
 static struct regmap_config regmap_spi_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -411,7 +411,7 @@ static void rx6110_spi_unregister(void)
 }
 #endif /* CONFIG_SPI_MASTER */
 
-#ifdef CONFIG_I2C
+#if IS_ENABLED(CONFIG_I2C)
 static struct regmap_config regmap_i2c_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

drivers/rtc/rtc-rx8010.c

@@ -55,7 +55,7 @@ static const struct i2c_device_id rx8010_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rx8010_id);
 
-static const struct of_device_id rx8010_of_match[] = {
+static const __maybe_unused struct of_device_id rx8010_of_match[] = {
 	{ .compatible = "epson,rx8010" },
 	{ }
 };
@@ -73,11 +73,11 @@ static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
 	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
 	int flagreg, err;
 
-	mutex_lock(&rx8010->rtc->ops_lock);
+	rtc_lock(rx8010->rtc);
 
 	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
 	if (err) {
-		mutex_unlock(&rx8010->rtc->ops_lock);
+		rtc_unlock(rx8010->rtc);
 		return IRQ_NONE;
 	}
 
@@ -100,7 +100,7 @@ static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
 	}
 
 	err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg);
-	mutex_unlock(&rx8010->rtc->ops_lock);
+	rtc_unlock(rx8010->rtc);
 	return err ? IRQ_NONE : IRQ_HANDLED;
 }
 
@@ -354,13 +354,7 @@ static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 	}
 }
 
-static const struct rtc_class_ops rx8010_rtc_ops_default = {
-	.read_time = rx8010_get_time,
-	.set_time = rx8010_set_time,
-	.ioctl = rx8010_ioctl,
-};
-
-static const struct rtc_class_ops rx8010_rtc_ops_alarm = {
+static const struct rtc_class_ops rx8010_rtc_ops = {
 	.read_time = rx8010_get_time,
 	.set_time = rx8010_set_time,
 	.ioctl = rx8010_ioctl,
@@ -409,12 +403,11 @@ static int rx8010_probe(struct i2c_client *client)
 			dev_err(dev, "unable to request IRQ\n");
 			return err;
 		}
-
-		rx8010->rtc->ops = &rx8010_rtc_ops_alarm;
 	} else {
-		rx8010->rtc->ops = &rx8010_rtc_ops_default;
+		clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features);
 	}
 
+	rx8010->rtc->ops = &rx8010_rtc_ops;
 	rx8010->rtc->max_user_freq = 1;
 	rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099;

drivers/rtc/rtc-rx8025.c

@@ -142,10 +142,9 @@ static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
 {
 	struct i2c_client *client = dev_id;
 	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
-	struct mutex *lock = &rx8025->rtc->ops_lock;
 	int status;
 
-	mutex_lock(lock);
+	rtc_lock(rx8025->rtc);
 	status = rx8025_read_reg(client, RX8025_REG_CTRL2);
 	if (status < 0)
 		goto out;
@@ -170,7 +169,7 @@ static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
 	}
 
 out:
-	mutex_unlock(lock);
+	rtc_unlock(rx8025->rtc);
 
 	return IRQ_HANDLED;
 }

drivers/rtc/rtc-rx8581.c

@@ -314,7 +314,7 @@ static const struct i2c_device_id rx8581_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rx8581_id);
 
-static const struct of_device_id rx8581_of_match[] = {
+static const __maybe_unused struct of_device_id rx8581_of_match[] = {
 	{ .compatible = "epson,rx8571", .data = &rx8571_config },
 	{ .compatible = "epson,rx8581", .data = &rx8581_config },
 	{ /* sentinel */ }

drivers/rtc/rtc-s35390a.c

@@ -55,7 +55,7 @@ static const struct i2c_device_id s35390a_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, s35390a_id);
 
-static const struct of_device_id s35390a_of_match[] = {
+static const __maybe_unused struct of_device_id s35390a_of_match[] = {
 	{ .compatible = "s35390a" },
 	{ .compatible = "sii,s35390a" },
 	{ }

drivers/rtc/rtc-s3c.c

@@ -382,7 +382,6 @@ static int s3c_rtc_remove(struct platform_device *pdev)
 static int s3c_rtc_probe(struct platform_device *pdev)
 {
 	struct s3c_rtc *info = NULL;
-	struct rtc_time rtc_tm;
 	int ret;
 
 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
@@ -448,20 +447,6 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 
 	device_init_wakeup(&pdev->dev, 1);
 
-	/* Check RTC Time */
-	if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
-		rtc_tm.tm_year	= 100;
-		rtc_tm.tm_mon	= 0;
-		rtc_tm.tm_mday	= 1;
-		rtc_tm.tm_hour	= 0;
-		rtc_tm.tm_min	= 0;
-		rtc_tm.tm_sec	= 0;
-
-		s3c_rtc_settime(&pdev->dev, &rtc_tm);
-
-		dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
-	}
-
 	/* register RTC and exit */
 	info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
 					     THIS_MODULE);
@@ -573,7 +558,7 @@ static struct s3c_rtc_data const s3c6410_rtc_data = {
 	.disable		= s3c6410_rtc_disable,
 };
 
-static const struct of_device_id s3c_rtc_dt_match[] = {
+static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
 	{
 		.compatible = "samsung,s3c2410-rtc",
 		.data = &s3c2410_rtc_data,

drivers/rtc/rtc-s5m.c

@@ -760,7 +760,8 @@ static int s5m_rtc_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	info->i2c = i2c_new_dummy_device(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
+	info->i2c = devm_i2c_new_dummy_device(&pdev->dev, s5m87xx->i2c->adapter,
+					      RTC_I2C_ADDR);
 	if (IS_ERR(info->i2c)) {
 		dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
 		return PTR_ERR(info->i2c);
@@ -771,7 +772,7 @@ static int s5m_rtc_probe(struct platform_device *pdev)
 		ret = PTR_ERR(info->regmap);
 		dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
 				ret);
-		goto err;
+		return ret;
 	}
 
 	info->dev = &pdev->dev;
@@ -781,26 +782,25 @@ static int s5m_rtc_probe(struct platform_device *pdev)
 	if (s5m87xx->irq_data) {
 		info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
 		if (info->irq <= 0) {
-			ret = -EINVAL;
 			dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
 				alarm_irq);
-			goto err;
+			return -EINVAL;
 		}
 	}
 
 	platform_set_drvdata(pdev, info);
 
 	ret = s5m8767_rtc_init_reg(info);
+	if (ret)
+		return ret;
 
 	device_init_wakeup(&pdev->dev, 1);
 
 	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
 						 &s5m_rtc_ops, THIS_MODULE);
 
-	if (IS_ERR(info->rtc_dev)) {
-		ret = PTR_ERR(info->rtc_dev);
-		goto err;
-	}
+	if (IS_ERR(info->rtc_dev))
+		return PTR_ERR(info->rtc_dev);
 
 	if (!info->irq) {
 		dev_info(&pdev->dev, "Alarm IRQ not available\n");
@@ -813,23 +813,9 @@ static int s5m_rtc_probe(struct platform_device *pdev)
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 			info->irq, ret);
-		goto err;
+		return ret;
 	}
 
-	return 0;
-
-err:
-	i2c_unregister_device(info->i2c);
-
-	return ret;
-}
-
-static int s5m_rtc_remove(struct platform_device *pdev)
-{
-	struct s5m_rtc_info *info = platform_get_drvdata(pdev);
-
-	i2c_unregister_device(info->i2c);
-
 	return 0;
 }
 
@@ -874,7 +860,6 @@ static struct platform_driver s5m_rtc_driver = {
 		.pm	= &s5m_rtc_pm_ops,
 	},
 	.probe		= s5m_rtc_probe,
-	.remove		= s5m_rtc_remove,
 	.id_table	= s5m_rtc_id,
 };
 

drivers/rtc/rtc-sd3078.c

@@ -207,7 +207,7 @@ static const struct i2c_device_id sd3078_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, sd3078_id);
 
-static const struct of_device_id rtc_dt_match[] = {
+static const __maybe_unused struct of_device_id rtc_dt_match[] = {
 	{ .compatible = "whwave,sd3078" },
 	{},
 };

drivers/rtc/rtc-stm32.c

@@ -209,7 +209,7 @@ static irqreturn_t stm32_rtc_alarm_irq(int irq, void *dev_id)
 	const struct stm32_rtc_events *evts = &rtc->data->events;
 	unsigned int status, cr;
 
-	mutex_lock(&rtc->rtc_dev->ops_lock);
+	rtc_lock(rtc->rtc_dev);
 
 	status = readl_relaxed(rtc->base + regs->sr);
 	cr = readl_relaxed(rtc->base + regs->cr);
@@ -226,7 +226,7 @@ static irqreturn_t stm32_rtc_alarm_irq(int irq, void *dev_id)
 		stm32_rtc_clear_event_flags(rtc, evts->alra);
 	}
 
-	mutex_unlock(&rtc->rtc_dev->ops_lock);
+	rtc_unlock(rtc->rtc_dev);
 
 	return IRQ_HANDLED;
 }

drivers/rtc/rtc-tegra.c

@@ -232,7 +232,7 @@ static irqreturn_t tegra_rtc_irq_handler(int irq, void *data)
 {
 	struct device *dev = data;
 	struct tegra_rtc_info *info = dev_get_drvdata(dev);
-	unsigned long events = 0, flags;
+	unsigned long events = 0;
 	u32 status;
 
 	status = readl(info->base + TEGRA_RTC_REG_INTR_STATUS);
@@ -240,10 +240,10 @@ static irqreturn_t tegra_rtc_irq_handler(int irq, void *data)
 		/* clear the interrupt masks and status on any IRQ */
 		tegra_rtc_wait_while_busy(dev);
 
-		spin_lock_irqsave(&info->lock, flags);
+		spin_lock(&info->lock);
 		writel(0, info->base + TEGRA_RTC_REG_INTR_MASK);
 		writel(status, info->base + TEGRA_RTC_REG_INTR_STATUS);
-		spin_unlock_irqrestore(&info->lock, flags);
+		spin_unlock(&info->lock);
 	}
 
 	/* check if alarm */

drivers/rtc/rtc-tps65910.c

@@ -361,13 +361,6 @@ static const struct rtc_class_ops tps65910_rtc_ops = {
 	.set_offset	= tps65910_set_offset,
 };
 
-static const struct rtc_class_ops tps65910_rtc_ops_noirq = {
-	.read_time	= tps65910_rtc_read_time,
-	.set_time	= tps65910_rtc_set_time,
-	.read_offset	= tps65910_read_offset,
-	.set_offset	= tps65910_set_offset,
-};
-
 static int tps65910_rtc_probe(struct platform_device *pdev)
 {
 	struct tps65910 *tps65910 = NULL;
@@ -426,11 +419,15 @@ static int tps65910_rtc_probe(struct platform_device *pdev)
 
 	tps_rtc->irq = irq;
 	if (irq != -1) {
-		device_set_wakeup_capable(&pdev->dev, 1);
-		tps_rtc->rtc->ops = &tps65910_rtc_ops;
-	} else
-		tps_rtc->rtc->ops = &tps65910_rtc_ops_noirq;
+		if (device_property_present(tps65910->dev, "wakeup-source"))
+			device_init_wakeup(&pdev->dev, 1);
+		else
+			device_set_wakeup_capable(&pdev->dev, 1);
+	} else {
+		clear_bit(RTC_FEATURE_ALARM, tps_rtc->rtc->features);
+	}
 
+	tps_rtc->rtc->ops = &tps65910_rtc_ops;
 	tps_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	tps_rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
 

drivers/rtc/rtc-tx4939.c

-// SPDX-License-Identifier: GPL-2.0
-/*
- * TX4939 internal RTC driver
- * Based on RBTX49xx patch from CELF patch archive.
- *
- * (C) Copyright TOSHIBA CORPORATION 2005-2007
- */
-#include <linux/rtc.h>
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/io.h>
-#include <linux/gfp.h>
-
-#define TX4939_RTCCTL_ALME	0x00000080
-#define TX4939_RTCCTL_ALMD	0x00000040
-#define TX4939_RTCCTL_BUSY	0x00000020
-
-#define TX4939_RTCCTL_COMMAND	0x00000007
-#define TX4939_RTCCTL_COMMAND_NOP	0x00000000
-#define TX4939_RTCCTL_COMMAND_GETTIME	0x00000001
-#define TX4939_RTCCTL_COMMAND_SETTIME	0x00000002
-#define TX4939_RTCCTL_COMMAND_GETALARM	0x00000003
-#define TX4939_RTCCTL_COMMAND_SETALARM	0x00000004
-
-#define TX4939_RTCTBC_PM	0x00000080
-#define TX4939_RTCTBC_COMP	0x0000007f
-
-#define TX4939_RTC_REG_RAMSIZE	0x00000100
-#define TX4939_RTC_REG_RWBSIZE	0x00000006
-
-struct tx4939_rtc_reg {
-	__u32 ctl;
-	__u32 adr;
-	__u32 dat;
-	__u32 tbc;
-};
-
-struct tx4939rtc_plat_data {
-	struct rtc_device *rtc;
-	struct tx4939_rtc_reg __iomem *rtcreg;
-	spinlock_t lock;
-};
-
-static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd)
-{
-	int i = 0;
-
-	__raw_writel(cmd, &rtcreg->ctl);
-	/* This might take 30us (next 32.768KHz clock) */
-	while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) {
-		/* timeout on approx. 100us (@ GBUS200MHz) */
-		if (i++ > 200 * 100)
-			return -EBUSY;
-		cpu_relax();
-	}
-	return 0;
-}
-
-static int tx4939_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
-	struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
-	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
-	unsigned long secs = rtc_tm_to_time64(tm);
-	int i, ret;
-	unsigned char buf[6];
-
-	buf[0] = 0;
-	buf[1] = 0;
-	buf[2] = secs;
-	buf[3] = secs >> 8;
-	buf[4] = secs >> 16;
-	buf[5] = secs >> 24;
-	spin_lock_irq(&pdata->lock);
-	__raw_writel(0, &rtcreg->adr);
-	for (i = 0; i < 6; i++)
-		__raw_writel(buf[i], &rtcreg->dat);
-	ret = tx4939_rtc_cmd(rtcreg,
-			     TX4939_RTCCTL_COMMAND_SETTIME |
-			     (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
-	spin_unlock_irq(&pdata->lock);
-	return ret;
-}
-
-static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
-	struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
-	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
-	int i, ret;
-	unsigned long sec;
-	unsigned char buf[6];
-
-	spin_lock_irq(&pdata->lock);
-	ret = tx4939_rtc_cmd(rtcreg,
-			     TX4939_RTCCTL_COMMAND_GETTIME |
-			     (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
-	if (ret) {
-		spin_unlock_irq(&pdata->lock);
-		return ret;
-	}
-	__raw_writel(2, &rtcreg->adr);
-	for (i = 2; i < 6; i++)
-		buf[i] = __raw_readl(&rtcreg->dat);
-	spin_unlock_irq(&pdata->lock);
-	sec = ((unsigned long)buf[5] << 24) | (buf[4] << 16) |
-		(buf[3] << 8) | buf[2];
-	rtc_time64_to_tm(sec, tm);
-	return 0;
-}
-
-static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
-	struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
-	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
-	int i, ret;
-	unsigned long sec;
-	unsigned char buf[6];
-
-	sec = rtc_tm_to_time64(&alrm->time);
-	buf[0] = 0;
-	buf[1] = 0;
-	buf[2] = sec;
-	buf[3] = sec >> 8;
-	buf[4] = sec >> 16;
-	buf[5] = sec >> 24;
-	spin_lock_irq(&pdata->lock);
-	__raw_writel(0, &rtcreg->adr);
-	for (i = 0; i < 6; i++)
-		__raw_writel(buf[i], &rtcreg->dat);
-	ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM |
-			     (alrm->enabled ? TX4939_RTCCTL_ALME : 0));
-	spin_unlock_irq(&pdata->lock);
-	return ret;
-}
-
-static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
-	struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
-	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
-	int i, ret;
-	unsigned long sec;
-	unsigned char buf[6];
-	u32 ctl;
-
-	spin_lock_irq(&pdata->lock);
-	ret = tx4939_rtc_cmd(rtcreg,
-			     TX4939_RTCCTL_COMMAND_GETALARM |
-			     (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
-	if (ret) {
-		spin_unlock_irq(&pdata->lock);
-		return ret;
-	}
-	__raw_writel(2, &rtcreg->adr);
-	for (i = 2; i < 6; i++)
-		buf[i] = __raw_readl(&rtcreg->dat);
-	ctl = __raw_readl(&rtcreg->ctl);
-	alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0;
-	alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0;
-	spin_unlock_irq(&pdata->lock);
-	sec = ((unsigned long)buf[5] << 24) | (buf[4] << 16) |
-		(buf[3] << 8) | buf[2];
-	rtc_time64_to_tm(sec, &alrm->time);
-	return rtc_valid_tm(&alrm->time);
-}
-
-static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
-{
-	struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev);
-
-	spin_lock_irq(&pdata->lock);
-	tx4939_rtc_cmd(pdata->rtcreg,
-		       TX4939_RTCCTL_COMMAND_NOP |
-		       (enabled ? TX4939_RTCCTL_ALME : 0));
-	spin_unlock_irq(&pdata->lock);
-	return 0;
-}
-
-static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id)
-{
-	struct tx4939rtc_plat_data *pdata = dev_get_drvdata(dev_id);
-	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
-	unsigned long events = RTC_IRQF;
-
-	spin_lock(&pdata->lock);
-	if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) {
-		events |= RTC_AF;
-		tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP);
-	}
-	spin_unlock(&pdata->lock);
-	rtc_update_irq(pdata->rtc, 1, events);
-
-	return IRQ_HANDLED;
-}
-
-static const struct rtc_class_ops tx4939_rtc_ops = {
-	.read_time		= tx4939_rtc_read_time,
-	.read_alarm		= tx4939_rtc_read_alarm,
-	.set_alarm		= tx4939_rtc_set_alarm,
-	.set_time		= tx4939_rtc_set_time,
-	.alarm_irq_enable	= tx4939_rtc_alarm_irq_enable,
-};
-
-static int tx4939_nvram_read(void *priv, unsigned int pos, void *val,
-			     size_t bytes)
-{
-	struct tx4939rtc_plat_data *pdata = priv;
-	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
-	u8 *buf = val;
-
-	spin_lock_irq(&pdata->lock);
-	for (; bytes; bytes--) {
-		__raw_writel(pos++, &rtcreg->adr);
-		*buf++ = __raw_readl(&rtcreg->dat);
-	}
-	spin_unlock_irq(&pdata->lock);
-	return 0;
-}
-
-static int tx4939_nvram_write(void *priv, unsigned int pos, void *val,
-			      size_t bytes)
-{
-	struct tx4939rtc_plat_data *pdata = priv;
-	struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
-	u8 *buf = val;
-
-	spin_lock_irq(&pdata->lock);
-	for (; bytes; bytes--) {
-		__raw_writel(pos++, &rtcreg->adr);
-		__raw_writel(*buf++, &rtcreg->dat);
-	}
-	spin_unlock_irq(&pdata->lock);
-	return 0;
-}
-
-static int __init tx4939_rtc_probe(struct platform_device *pdev)
-{
-	struct rtc_device *rtc;
-	struct tx4939rtc_plat_data *pdata;
-	int irq, ret;
-	struct nvmem_config nvmem_cfg = {
-		.name = "tx4939_nvram",
-		.size = TX4939_RTC_REG_RAMSIZE,
-		.reg_read = tx4939_nvram_read,
-		.reg_write = tx4939_nvram_write,
-	};
-
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return -ENODEV;
-	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
-	if (!pdata)
-		return -ENOMEM;
-	platform_set_drvdata(pdev, pdata);
-
-	pdata->rtcreg = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(pdata->rtcreg))
-		return PTR_ERR(pdata->rtcreg);
-
-	spin_lock_init(&pdata->lock);
-	tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
-	if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt,
-			     0, pdev->name, &pdev->dev) < 0)
-		return -EBUSY;
-	rtc = devm_rtc_allocate_device(&pdev->dev);
-	if (IS_ERR(rtc))
-		return PTR_ERR(rtc);
-
-	rtc->ops = &tx4939_rtc_ops;
-	rtc->range_max = U32_MAX;
-
-	pdata->rtc = rtc;
-
-	nvmem_cfg.priv = pdata;
-	ret = devm_rtc_nvmem_register(rtc, &nvmem_cfg);
-	if (ret)
-		return ret;
-
-	return devm_rtc_register_device(rtc);
-}
-
-static int __exit tx4939_rtc_remove(struct platform_device *pdev)
-{
-	struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev);
-
-	spin_lock_irq(&pdata->lock);
-	tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
-	spin_unlock_irq(&pdata->lock);
-	return 0;
-}
-
-static struct platform_driver tx4939_rtc_driver = {
-	.remove		= __exit_p(tx4939_rtc_remove),
-	.driver		= {
-		.name	= "tx4939rtc",
-	},
-};
-
-module_platform_driver_probe(tx4939_rtc_driver, tx4939_rtc_probe);
-
-MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
-MODULE_DESCRIPTION("TX4939 internal RTC driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:tx4939rtc");

include/linux/rtc.h

@@ -141,6 +141,8 @@ struct rtc_device {
 	 */
 	unsigned long set_offset_nsec;
 
+	unsigned long features[BITS_TO_LONGS(RTC_FEATURE_CNT)];
+
 	time64_t range_min;
 	timeu64_t range_max;
 	time64_t start_secs;

include/linux/rtc/sirfsoc_rtciobrg.h

-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * RTC I/O Bridge interfaces for CSR SiRFprimaII
- * ARM access the registers of SYSRTC, GPSRTC and PWRC through this module
- *
- * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
- */
-#ifndef _SIRFSOC_RTC_IOBRG_H_
-#define _SIRFSOC_RTC_IOBRG_H_
-
-struct regmap_config;
-
-extern void sirfsoc_rtc_iobrg_besyncing(void);
-
-extern u32 sirfsoc_rtc_iobrg_readl(u32 addr);
-
-extern void sirfsoc_rtc_iobrg_writel(u32 val, u32 addr);
-struct regmap *devm_regmap_init_iobg(struct device *dev,
-				    const struct regmap_config *config);
-
-#endif

include/uapi/linux/rtc.h

@@ -110,6 +110,11 @@ struct rtc_pll_info {
 #define RTC_AF 0x20	/* Alarm interrupt */
 #define RTC_UF 0x10	/* Update interrupt for 1Hz RTC */
 
+/* feature list */
+#define RTC_FEATURE_ALARM		0
+#define RTC_FEATURE_ALARM_RES_MINUTE	1
+#define RTC_FEATURE_NEED_WEEK_DAY	2
+#define RTC_FEATURE_CNT			3
 
 #define RTC_MAX_FREQ	8192