Merge tag 'rtc-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "Not much this cycle. I've pushed the at32ap700x removal late but it is
  unlikely to cause any issues.

  Summary:

  Subsystem:
   - Move ABI documentation to Documentation/ABI

  New driver:
   - NXP i.MX53 SRTC
   - Chrome OS EC RTC

  Drivers:
   - Remove at32ap700x
   - Many fixes in various error paths"

* tag 'rtc-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
  rtc: remove rtc-at32ap700x
  Documentation: rtc: move iotcl interface documentation to ABI
  Documentation: rtc: add sysfs file permissions
  Documentation: rtc: move sysfs documentation to ABI
  rtc: mxc_v2: remove __exit annotation
  rtc: mxc_v2: Remove unnecessary platform_get_resource() error check
  rtc: add mxc driver for i.MX53 SRTC
  dt-bindings: rtc: add bindings for i.MX53 SRTC
  rtc: r7301: Fix a possible sleep-in-atomic bug in rtc7301_set_time
  rtc: r7301: Fix a possible sleep-in-atomic bug in rtc7301_read_time
  rtc: omap: fix unbalanced clk_prepare_enable/clk_disable_unprepare
  rtc: ac100: Fix multiple race conditions
  rtc: sun6i: ensure rtc is kfree'd on error
  rtc: cros-ec: add cros-ec-rtc driver.
  mfd: cros_ec: Introduce RTC commands and events definitions.
  rtc: stm32: Fix copyright
  rtc: Remove unused RTC_DEVICE_NAME_SIZE
  rtc: r9701: Remove r9701_remove function
  rtc: brcmstb-waketimer: fix error handling in brcmstb_waketmr_probe()

Documentation/ABI/testing/rtc-cdev

+What:		/dev/rtcX
+Date:		April 2005
+KernelVersion:	2.6.12
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		The ioctl interface to drivers for real-time clocks (RTCs).
+		Following actions are supported:
+
+		* RTC_RD_TIME, RTC_SET_TIME: Read or set the RTC time. Time
+		  format is a Gregorian calendar date and 24 hour wall clock
+		  time.
+
+		* RTC_AIE_ON, RTC_AIE_OFF: Enable or disable the alarm interrupt
+		  for RTCs that support alarms
+
+		* RTC_ALM_READ, RTC_ALM_SET: Read or set the alarm time for
+		  RTCs that support alarms. Can be set upto 24 hours in the
+		  future. Requires a separate RTC_AIE_ON call to enable the
+		  alarm interrupt. (Prefer to use RTC_WKALM_*)
+
+		* RTC_WKALM_RD, RTC_WKALM_SET: For RTCs that support a more
+		  powerful interface, which can issue alarms beyond 24 hours and
+		  enable IRQs in the same request.
+
+		* RTC_PIE_ON, RTC_PIE_OFF: Enable or disable the periodic
+		  interrupt for RTCs that support periodic interrupts.
+
+		* RTC_UIE_ON, RTC_UIE_OFF: Enable or disable the update
+		  interrupt for RTCs that support it.
+
+		* RTC_IRQP_READ, RTC_IRQP_SET: Read or set the frequency for
+		  periodic interrupts for RTCs that support periodic interrupts.
+		  Requires a separate RTC_PIE_ON call to enable the periodic
+		  interrupts.
+
+		The ioctl() calls supported by the older /dev/rtc interface are
+		also supported by the newer RTC class framework. However,
+		because the chips and systems are not standardized, some PC/AT
+		functionality might not be provided. And in the same way, some
+		newer features -- including those enabled by ACPI -- are exposed
+		by the RTC class framework, but can't be supported by the older
+		driver.

Documentation/ABI/testing/sysfs-class-rtc

+What:		/sys/class/rtc/
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		The rtc/ class subdirectory belongs to the RTC subsystem.
+
+What:		/sys/class/rtc/rtcX/
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		The /sys/class/rtc/rtc{0,1,2,3,...} directories correspond
+		to each RTC device.
+
+What:		/sys/class/rtc/rtcX/date
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RO) RTC-provided date in YYYY-MM-DD format
+
+What:		/sys/class/rtc/rtcX/hctosys
+Date:		September 2009
+KernelVersion:	2.6.32
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RO) 1 if the RTC provided the system time at boot via the
+		CONFIG_RTC_HCTOSYS kernel option, 0 otherwise
+
+What:		/sys/class/rtc/rtcX/max_user_freq
+Date:		October 2007
+KernelVersion:	2.6.24
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RW) The maximum interrupt rate an unprivileged user may request
+		from this RTC.
+
+What:		/sys/class/rtc/rtcX/name
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RO) The name of the RTC corresponding to this sysfs directory
+
+What:		/sys/class/rtc/rtcX/since_epoch
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RO) RTC-provided time as the number of seconds since the epoch
+
+What:		/sys/class/rtc/rtcX/time
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RO) RTC-provided time in 24-hour notation (hh:mm:ss)
+
+What:		/sys/class/rtc/rtcX/*/nvmem
+Date:		February 2016
+KernelVersion:	4.6
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RW) The non volatile storage exported as a raw file, as
+		described in Documentation/nvmem/nvmem.txt
+
+What:		/sys/class/rtc/rtcX/offset
+Date:		February 2016
+KernelVersion:	4.6
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RW) The amount which the rtc clock has been adjusted in
+		firmware. Visible only if the driver supports clock offset
+		adjustment. The unit is parts per billion, i.e. The number of
+		clock ticks which are added to or removed from the rtc's base
+		clock per billion ticks. A positive value makes a day pass more
+		slowly, longer, and a negative value makes a day pass more
+		quickly.
+
+What:		/sys/class/rtc/rtcX/wakealarm
+Date:		February 2007
+KernelVersion:	2.6.20
+Contact:	linux-rtc@vger.kernel.org
+Description:
+		(RW) The time at which the clock will generate a system wakeup
+		event. This is a one shot wakeup event, so must be reset after
+		wake if a daily wakeup is required. Format is seconds since the
+		epoch by default, or if there's a leading +, seconds in the
+		future, or if there is a leading +=, seconds ahead of the
+		current alarm.

Documentation/devicetree/bindings/rtc/rtc-mxc_v2.txt

+* i.MX53 Secure Real Time Clock (SRTC)
+
+Required properties:
+- compatible: should be: "fsl,imx53-rtc"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- clocks: should contain the phandle for the rtc clock
+- interrupts: rtc alarm interrupt
+
+Example:
+
+rtc@53fa4000 {
+	compatible = "fsl,imx53-rtc";
+	reg = <0x53fa4000 0x4000>;
+	interrupts = <24>;
+	clocks = <&clks IMX5_CLK_SRTC_GATE>;
+};

Documentation/rtc.txt

@@ -136,82 +136,5 @@ a high functionality RTC is integrated into the SOC.  That system might read
 the system clock from the discrete RTC, but use the integrated one for all
 other tasks, because of its greater functionality.
 
-SYSFS interface
----------------
-
-The sysfs interface under /sys/class/rtc/rtcN provides access to various
-rtc attributes without requiring the use of ioctls. All dates and times
-are in the RTC's timezone, rather than in system time.
-
-================ ==============================================================
-date  	   	 RTC-provided date
-hctosys   	 1 if the RTC provided the system time at boot via the
-		 CONFIG_RTC_HCTOSYS kernel option, 0 otherwise
-max_user_freq	 The maximum interrupt rate an unprivileged user may request
-		 from this RTC.
-name		 The name of the RTC corresponding to this sysfs directory
-since_epoch	 The number of seconds since the epoch according to the RTC
-time		 RTC-provided time
-wakealarm	 The time at which the clock will generate a system wakeup
-		 event. This is a one shot wakeup event, so must be reset
-		 after wake if a daily wakeup is required. Format is seconds
-		 since the epoch by default, or if there's a leading +, seconds
-		 in the future, or if there is a leading +=, seconds ahead of
-		 the current alarm.
-offset		 The amount which the rtc clock has been adjusted in firmware.
-		 Visible only if the driver supports clock offset adjustment.
-		 The unit is parts per billion, i.e. The number of clock ticks
-		 which are added to or removed from the rtc's base clock per
-		 billion ticks. A positive value makes a day pass more slowly,
-		 longer, and a negative value makes a day pass more quickly.
-*/nvmem		 The non volatile storage exported as a raw file, as described
-		 in Documentation/nvmem/nvmem.txt
-================ ==============================================================
-
-IOCTL interface
----------------
-
-The ioctl() calls supported by /dev/rtc are also supported by the RTC class
-framework.  However, because the chips and systems are not standardized,
-some PC/AT functionality might not be provided.  And in the same way, some
-newer features -- including those enabled by ACPI -- are exposed by the
-RTC class framework, but can't be supported by the older driver.
-
-    *	RTC_RD_TIME, RTC_SET_TIME ... every RTC supports at least reading
-	time, returning the result as a Gregorian calendar date and 24 hour
-	wall clock time.  To be most useful, this time may also be updated.
-
-    *	RTC_AIE_ON, RTC_AIE_OFF, RTC_ALM_SET, RTC_ALM_READ ... when the RTC
-	is connected to an IRQ line, it can often issue an alarm IRQ up to
-	24 hours in the future.  (Use RTC_WKALM_* by preference.)
-
-    *	RTC_WKALM_SET, RTC_WKALM_RD ... RTCs that can issue alarms beyond
-	the next 24 hours use a slightly more powerful API, which supports
-	setting the longer alarm time and enabling its IRQ using a single
-	request (using the same model as EFI firmware).
-
-    *	RTC_UIE_ON, RTC_UIE_OFF ... if the RTC offers IRQs, the RTC framework
-	will emulate this mechanism.
-
-    *	RTC_PIE_ON, RTC_PIE_OFF, RTC_IRQP_SET, RTC_IRQP_READ ... these icotls
-	are emulated via a kernel hrtimer.
-
-In many cases, the RTC alarm can be a system wake event, used to force
-Linux out of a low power sleep state (or hibernation) back to a fully
-operational state.  For example, a system could enter a deep power saving
-state until it's time to execute some scheduled tasks.
-
-Note that many of these ioctls are handled by the common rtc-dev interface.
-Some common examples:
-
-    *	RTC_RD_TIME, RTC_SET_TIME: the read_time/set_time functions will be
-	called with appropriate values.
-
-    *	RTC_ALM_SET, RTC_ALM_READ, RTC_WKALM_SET, RTC_WKALM_RD: gets or sets
-	the alarm rtc_timer. May call the set_alarm driver function.
-
-    *	RTC_IRQP_SET, RTC_IRQP_READ: These are emulated by the generic code.
-
-    *	RTC_PIE_ON, RTC_PIE_OFF: These are also emulated by the generic code.
-
-If all else fails, check out the tools/testing/selftests/timers/rtctest.c test!
+Check out tools/testing/selftests/timers/rtctest.c for an example usage of the
+ioctl interface.

drivers/rtc/Kconfig

@@ -1255,6 +1255,16 @@ config RTC_DRV_ZYNQMP
 	  If you say yes here you get support for the RTC controller found on
 	  Xilinx Zynq Ultrascale+ MPSoC.
 
+config RTC_DRV_CROS_EC
+	tristate "Chrome OS EC RTC driver"
+	depends on MFD_CROS_EC
+	help
+	  If you say yes here you will get support for the
+	  Chrome OS Embedded Controller's RTC.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-cros-ec.
+
 comment "on-CPU RTC drivers"
 
 config RTC_DRV_ASM9260
@@ -1392,13 +1402,6 @@ config RTC_DRV_PL031
 	  To compile this driver as a module, choose M here: the
 	  module will be called rtc-pl031.
 
-config RTC_DRV_AT32AP700X
-	tristate "AT32AP700X series RTC"
-	depends on PLATFORM_AT32AP || COMPILE_TEST
-	help
-	  Driver for the internal RTC (Realtime Clock) on Atmel AVR32
-	  AT32AP700x family processors.
-
 config RTC_DRV_AT91RM9200
 	tristate "AT91RM9200 or some AT91SAM9 RTC"
 	depends on ARCH_AT91 || COMPILE_TEST
@@ -1689,6 +1692,16 @@ config RTC_DRV_MXC
 	   This driver can also be built as a module, if so, the module
 	   will be called "rtc-mxc".
 
+config RTC_DRV_MXC_V2
+	tristate "Freescale MXC Real Time Clock for i.MX53"
+	depends on ARCH_MXC
+	help
+	   If you say yes here you get support for the Freescale MXC
+	   SRTC module in i.MX53 processor.
+
+	   This driver can also be built as a module, if so, the module
+	   will be called "rtc-mxc_v2".
+
 config RTC_DRV_SNVS
 	tristate "Freescale SNVS RTC support"
 	select REGMAP_MMIO

drivers/rtc/Makefile

@@ -33,7 +33,6 @@ obj-$(CONFIG_RTC_DRV_AC100)	+= rtc-ac100.o
 obj-$(CONFIG_RTC_DRV_ARMADA38X)	+= rtc-armada38x.o
 obj-$(CONFIG_RTC_DRV_AS3722)	+= rtc-as3722.o
 obj-$(CONFIG_RTC_DRV_ASM9260)	+= rtc-asm9260.o
-obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
 obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
 obj-$(CONFIG_RTC_DRV_AT91SAM9)	+= rtc-at91sam9.o
 obj-$(CONFIG_RTC_DRV_AU1XXX)	+= rtc-au1xxx.o
@@ -44,6 +43,7 @@ obj-$(CONFIG_RTC_DRV_BQ4802)	+= rtc-bq4802.o
 obj-$(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
 obj-$(CONFIG_RTC_DRV_DA9055)	+= rtc-da9055.o
 obj-$(CONFIG_RTC_DRV_DA9063)	+= rtc-da9063.o
@@ -106,6 +106,7 @@ obj-$(CONFIG_RTC_DRV_MT6397)	+= rtc-mt6397.o
 obj-$(CONFIG_RTC_DRV_MT7622)	+= rtc-mt7622.o
 obj-$(CONFIG_RTC_DRV_MV)	+= rtc-mv.o
 obj-$(CONFIG_RTC_DRV_MXC)	+= rtc-mxc.o
+obj-$(CONFIG_RTC_DRV_MXC_V2)	+= rtc-mxc_v2.o
 obj-$(CONFIG_RTC_DRV_NUC900)	+= rtc-nuc900.o
 obj-$(CONFIG_RTC_DRV_OMAP)	+= rtc-omap.o
 obj-$(CONFIG_RTC_DRV_OPAL)	+= rtc-opal.o

drivers/rtc/rtc-ac100.c

@@ -569,6 +569,12 @@ static int ac100_rtc_probe(struct platform_device *pdev)
 		return chip->irq;
 	}
 
+	chip->rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(chip->rtc))
+		return PTR_ERR(chip->rtc);
+
+	chip->rtc->ops = &ac100_rtc_ops;
+
 	ret = devm_request_threaded_irq(&pdev->dev, chip->irq, NULL,
 					ac100_rtc_irq,
 					IRQF_SHARED | IRQF_ONESHOT,
@@ -588,17 +594,16 @@ static int ac100_rtc_probe(struct platform_device *pdev)
 	/* clear counter alarm pending interrupts */
 	regmap_write(chip->regmap, AC100_ALM_INT_STA, AC100_ALM_INT_ENABLE);
 
-	chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-ac100",
-					     &ac100_rtc_ops, THIS_MODULE);
-	if (IS_ERR(chip->rtc)) {
-		dev_err(&pdev->dev, "unable to register device\n");
-		return PTR_ERR(chip->rtc);
-	}
-
 	ret = ac100_rtc_register_clks(chip);
 	if (ret)
 		return ret;
 
+	ret = rtc_register_device(chip->rtc);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to register device\n");
+		return ret;
+	}
+
 	dev_info(&pdev->dev, "RTC enabled\n");
 
 	return 0;

drivers/rtc/rtc-at32ap700x.c

-/*
- * An RTC driver for the AVR32 AT32AP700x processor series.
- *
- * Copyright (C) 2007 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/rtc.h>
-#include <linux/io.h>
-
-/*
- * This is a bare-bones RTC. It runs during most system sleep states, but has
- * no battery backup and gets reset during system restart.  It must be
- * initialized from an external clock (network, I2C, etc) before it can be of
- * much use.
- *
- * The alarm functionality is limited by the hardware, not supporting
- * periodic interrupts.
- */
-
-#define RTC_CTRL		0x00
-#define RTC_CTRL_EN		   0
-#define RTC_CTRL_PCLR		   1
-#define RTC_CTRL_TOPEN		   2
-#define RTC_CTRL_PSEL		   8
-
-#define RTC_VAL			0x04
-
-#define RTC_TOP			0x08
-
-#define RTC_IER			0x10
-#define RTC_IER_TOPI		   0
-
-#define RTC_IDR			0x14
-#define RTC_IDR_TOPI		   0
-
-#define RTC_IMR			0x18
-#define RTC_IMR_TOPI		   0
-
-#define RTC_ISR			0x1c
-#define RTC_ISR_TOPI		   0
-
-#define RTC_ICR			0x20
-#define RTC_ICR_TOPI		   0
-
-#define RTC_BIT(name)		(1 << RTC_##name)
-#define RTC_BF(name, value)	((value) << RTC_##name)
-
-#define rtc_readl(dev, reg)				\
-	__raw_readl((dev)->regs + RTC_##reg)
-#define rtc_writel(dev, reg, value)			\
-	__raw_writel((value), (dev)->regs + RTC_##reg)
-
-struct rtc_at32ap700x {
-	struct rtc_device	*rtc;
-	void __iomem		*regs;
-	unsigned long		alarm_time;
-	unsigned long		irq;
-	/* Protect against concurrent register access. */
-	spinlock_t		lock;
-};
-
-static int at32_rtc_readtime(struct device *dev, struct rtc_time *tm)
-{
-	struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
-	unsigned long now;
-
-	now = rtc_readl(rtc, VAL);
-	rtc_time_to_tm(now, tm);
-
-	return 0;
-}
-
-static int at32_rtc_settime(struct device *dev, struct rtc_time *tm)
-{
-	struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
-	unsigned long now;
-	int ret;
-
-	ret = rtc_tm_to_time(tm, &now);
-	if (ret == 0)
-		rtc_writel(rtc, VAL, now);
-
-	return ret;
-}
-
-static int at32_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
-	struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
-
-	spin_lock_irq(&rtc->lock);
-	rtc_time_to_tm(rtc->alarm_time, &alrm->time);
-	alrm->enabled = rtc_readl(rtc, IMR) & RTC_BIT(IMR_TOPI) ? 1 : 0;
-	alrm->pending = rtc_readl(rtc, ISR) & RTC_BIT(ISR_TOPI) ? 1 : 0;
-	spin_unlock_irq(&rtc->lock);
-
-	return 0;
-}
-
-static int at32_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
-	struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
-	unsigned long rtc_unix_time;
-	unsigned long alarm_unix_time;
-	int ret;
-
-	rtc_unix_time = rtc_readl(rtc, VAL);
-
-	ret = rtc_tm_to_time(&alrm->time, &alarm_unix_time);
-	if (ret)
-		return ret;
-
-	if (alarm_unix_time < rtc_unix_time)
-		return -EINVAL;
-
-	spin_lock_irq(&rtc->lock);
-	rtc->alarm_time = alarm_unix_time;
-	rtc_writel(rtc, TOP, rtc->alarm_time);
-	if (alrm->enabled)
-		rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
-				| RTC_BIT(CTRL_TOPEN));
-	else
-		rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
-				& ~RTC_BIT(CTRL_TOPEN));
-	spin_unlock_irq(&rtc->lock);
-
-	return ret;
-}
-
-static int at32_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
-{
-	struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
-	int ret = 0;
-
-	spin_lock_irq(&rtc->lock);
-
-	if (enabled) {
-		if (rtc_readl(rtc, VAL) > rtc->alarm_time) {
-			ret = -EINVAL;
-			goto out;
-		}
-		rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
-				| RTC_BIT(CTRL_TOPEN));
-		rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
-		rtc_writel(rtc, IER, RTC_BIT(IER_TOPI));
-	} else {
-		rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
-				& ~RTC_BIT(CTRL_TOPEN));
-		rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
-		rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
-	}
-out:
-	spin_unlock_irq(&rtc->lock);
-
-	return ret;
-}
-
-static irqreturn_t at32_rtc_interrupt(int irq, void *dev_id)
-{
-	struct rtc_at32ap700x *rtc = (struct rtc_at32ap700x *)dev_id;
-	unsigned long isr = rtc_readl(rtc, ISR);
-	unsigned long events = 0;
-	int ret = IRQ_NONE;
-
-	spin_lock(&rtc->lock);
-
-	if (isr & RTC_BIT(ISR_TOPI)) {
-		rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
-		rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
-		rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
-				& ~RTC_BIT(CTRL_TOPEN));
-		rtc_writel(rtc, VAL, rtc->alarm_time);
-		events = RTC_AF | RTC_IRQF;
-		rtc_update_irq(rtc->rtc, 1, events);
-		ret = IRQ_HANDLED;
-	}
-
-	spin_unlock(&rtc->lock);
-
-	return ret;
-}
-
-static const struct rtc_class_ops at32_rtc_ops = {
-	.read_time	= at32_rtc_readtime,
-	.set_time	= at32_rtc_settime,
-	.read_alarm	= at32_rtc_readalarm,
-	.set_alarm	= at32_rtc_setalarm,
-	.alarm_irq_enable = at32_rtc_alarm_irq_enable,
-};
-
-static int __init at32_rtc_probe(struct platform_device *pdev)
-{
-	struct resource	*regs;
-	struct rtc_at32ap700x *rtc;
-	int irq;
-	int ret;
-
-	rtc = devm_kzalloc(&pdev->dev, sizeof(struct rtc_at32ap700x),
-			   GFP_KERNEL);
-	if (!rtc)
-		return -ENOMEM;
-
-	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!regs) {
-		dev_dbg(&pdev->dev, "no mmio resource defined\n");
-		return -ENXIO;
-	}
-
-	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0) {
-		dev_dbg(&pdev->dev, "could not get irq\n");
-		return -ENXIO;
-	}
-
-	rtc->irq = irq;
-	rtc->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
-	if (!rtc->regs) {
-		dev_dbg(&pdev->dev, "could not map I/O memory\n");
-		return -ENOMEM;
-	}
-	spin_lock_init(&rtc->lock);
-
-	/*
-	 * Maybe init RTC: count from zero at 1 Hz, disable wrap irq.
-	 *
-	 * Do not reset VAL register, as it can hold an old time
-	 * from last JTAG reset.
-	 */
-	if (!(rtc_readl(rtc, CTRL) & RTC_BIT(CTRL_EN))) {
-		rtc_writel(rtc, CTRL, RTC_BIT(CTRL_PCLR));
-		rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
-		rtc_writel(rtc, CTRL, RTC_BF(CTRL_PSEL, 0xe)
-				| RTC_BIT(CTRL_EN));
-	}
-
-	ret = devm_request_irq(&pdev->dev, irq, at32_rtc_interrupt, IRQF_SHARED,
-				"rtc", rtc);
-	if (ret) {
-		dev_dbg(&pdev->dev, "could not request irq %d\n", irq);
-		return ret;
-	}
-
-	platform_set_drvdata(pdev, rtc);
-
-	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
-				&at32_rtc_ops, THIS_MODULE);
-	if (IS_ERR(rtc->rtc)) {
-		dev_dbg(&pdev->dev, "could not register rtc device\n");
-		return PTR_ERR(rtc->rtc);
-	}
-
-	device_init_wakeup(&pdev->dev, 1);
-
-	dev_info(&pdev->dev, "Atmel RTC for AT32AP700x at %08lx irq %ld\n",
-			(unsigned long)rtc->regs, rtc->irq);
-
-	return 0;
-}
-
-static int __exit at32_rtc_remove(struct platform_device *pdev)
-{
-	device_init_wakeup(&pdev->dev, 0);
-
-	return 0;
-}
-
-MODULE_ALIAS("platform:at32ap700x_rtc");
-
-static struct platform_driver at32_rtc_driver = {
-	.remove		= __exit_p(at32_rtc_remove),
-	.driver		= {
-		.name	= "at32ap700x_rtc",
-	},
-};
-
-module_platform_driver_probe(at32_rtc_driver, at32_rtc_probe);
-
-MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
-MODULE_DESCRIPTION("Real time clock for AVR32 AT32AP700x");
-MODULE_LICENSE("GPL");

drivers/rtc/rtc-brcmstb-waketimer.c

@@ -253,7 +253,7 @@ static int brcmstb_waketmr_probe(struct platform_device *pdev)
 	ret = devm_request_irq(dev, timer->irq, brcmstb_waketmr_irq, 0,
 			       "brcmstb-waketimer", timer);
 	if (ret < 0)
-		return ret;
+		goto err_clk;
 
 	timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
 	register_reboot_notifier(&timer->reboot_notifier);
@@ -262,12 +262,21 @@ static int brcmstb_waketmr_probe(struct platform_device *pdev)
 					 &brcmstb_waketmr_ops, THIS_MODULE);
 	if (IS_ERR(timer->rtc)) {
 		dev_err(dev, "unable to register device\n");
-		unregister_reboot_notifier(&timer->reboot_notifier);
-		return PTR_ERR(timer->rtc);
+		ret = PTR_ERR(timer->rtc);
+		goto err_notifier;
 	}
 
 	dev_info(dev, "registered, with irq %d\n", timer->irq);
 
+	return 0;
+
+err_notifier:
+	unregister_reboot_notifier(&timer->reboot_notifier);
+
+err_clk:
+	if (timer->clk)
+		clk_disable_unprepare(timer->clk);
+
 	return ret;
 }
 

drivers/rtc/rtc-omap.c

@@ -753,8 +753,10 @@ static int omap_rtc_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	rtc->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(rtc->base))
+	if (IS_ERR(rtc->base)) {
+		clk_disable_unprepare(rtc->clk);
 		return PTR_ERR(rtc->base);
+	}
 
 	platform_set_drvdata(pdev, rtc);
 
@@ -887,6 +889,7 @@ static int omap_rtc_probe(struct platform_device *pdev)
 	return 0;
 
 err:
+	clk_disable_unprepare(rtc->clk);
 	device_init_wakeup(&pdev->dev, false);
 	rtc->type->lock(rtc);
 	pm_runtime_put_sync(&pdev->dev);

drivers/rtc/rtc-r7301.c

@@ -95,7 +95,7 @@ static int rtc7301_wait_while_busy(struct rtc7301_priv *priv)
 		if (!(val & RTC7301_CONTROL_BUSY))
 			return 0;
 
-		usleep_range(200, 300);
+		udelay(300);
 	}
 
 	return -ETIMEDOUT;
@@ -235,7 +235,7 @@ static int rtc7301_set_time(struct device *dev, struct rtc_time *tm)
 	spin_lock_irqsave(&priv->lock, flags);
 
 	rtc7301_stop(priv);
-	usleep_range(200, 300);
+	udelay(300);
 	rtc7301_select_bank(priv, 0);
 	rtc7301_write_time(priv, tm, false);
 	rtc7301_start(priv);

drivers/rtc/rtc-r9701.c

@@ -164,17 +164,11 @@ static int r9701_probe(struct spi_device *spi)
 	return 0;
 }
 
-static int r9701_remove(struct spi_device *spi)
-{
-	return 0;
-}
-
 static struct spi_driver r9701_driver = {
 	.driver = {
 		.name	= "rtc-r9701",
 	},
 	.probe	= r9701_probe,
-	.remove = r9701_remove,
 };
 
 module_spi_driver(r9701_driver);

drivers/rtc/rtc-stm32.c

 /*
- * Copyright (C) Amelie Delaunay 2016
- * Author:  Amelie Delaunay <amelie.delaunay@st.com>
+ * Copyright (C) STMicroelectronics SA 2017
+ * Author:  Amelie Delaunay <amelie.delaunay@st.com> for STMicroelectronics.
  * License terms:  GNU General Public License (GPL), version 2
  */
 

drivers/rtc/rtc-sun6i.c

@@ -201,8 +201,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node)
 
 	clk_data = kzalloc(sizeof(*clk_data) + (sizeof(*clk_data->hws) * 2),
 			   GFP_KERNEL);
-	if (!clk_data)
+	if (!clk_data) {
+		kfree(rtc);
 		return;
+	}
 
 	spin_lock_init(&rtc->lock);
 

include/linux/mfd/cros_ec_commands.h

@@ -291,6 +291,9 @@ enum host_event_code {
 	/* EC desires to change state of host-controlled USB mux */
 	EC_HOST_EVENT_USB_MUX = 28,
 
+	/* EC RTC event occurred */
+	EC_HOST_EVENT_RTC = 26,
+
 	/*
 	 * The high bit of the event mask is not used as a host event code.  If
 	 * it reads back as set, then the entire event mask should be
@@ -799,6 +802,8 @@ enum ec_feature_code {
 	EC_FEATURE_USB_MUX = 23,
 	/* Motion Sensor code has an internal software FIFO */
 	EC_FEATURE_MOTION_SENSE_FIFO = 24,
+	/* EC has RTC feature that can be controlled by host commands */
+	EC_FEATURE_RTC = 27,
 };
 
 #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
@@ -1709,6 +1714,9 @@ struct ec_response_rtc {
 #define EC_CMD_RTC_SET_VALUE 0x46
 #define EC_CMD_RTC_SET_ALARM 0x47
 
+/* Pass as param to SET_ALARM to clear the current alarm */
+#define EC_RTC_ALARM_CLEAR 0
+
 /*****************************************************************************/
 /* Port80 log access */
 

include/linux/rtc.h

@@ -87,7 +87,6 @@ struct rtc_class_ops {
 	int (*set_offset)(struct device *, long offset);
 };
 
-#define RTC_DEVICE_NAME_SIZE 20
 typedef struct rtc_task {
 	void (*func)(void *private_data);
 	void *private_data;