Merge tag 'samsung-drivers-5.16' of...

Merge tag 'samsung-drivers-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux into arm/drivers

Samsung SoC drivers changes for v5.16

1. Convert Exynos ChipID and ASV driver to a module and make it a
   default, instead of selected. The driver is not essential, so it
   could be disabled, if needed.
2. Add support for Exynos850 and Exynos Auto v9 to Exynos ChipID and ASV
   driver.
3. Get rid of HAVE_S3C_RTC because it was adding just another layer
   instead of direct dependencies.
4. Minor cleanups.

* tag 'samsung-drivers-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux:
  soc: samsung: exynos-chipid: add exynosautov9 SoC support
  rtc: s3c: remove HAVE_S3C_RTC in favor of direct dependencies
  soc: samsung: exynos-chipid: Add Exynos850 support
  dt-bindings: samsung: exynos-chipid: Document Exynos850 compatible
  soc: samsung: exynos-chipid: Pass revision reg offsets
  soc: samsung: pm_domains: drop unused is_off field
  arm64: exynos: don't have ARCH_EXYNOS select EXYNOS_CHIPID
  soc: samsung: exynos-chipid: do not enforce built-in
  soc: samsung: exynos-chipid: convert to a module
  soc: samsung: exynos-chipid: avoid soc_device_to_device()
  soc: samsung: exynos-pmu: Fix compilation when nothing selects CONFIG_MFD_CORE

Link: https://lore.kernel.org/r/20211026094709.75692-2-krzysztof.kozlowski@canonical.comSigned-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/devicetree/bindings/arm/samsung/exynos-chipid.yaml

@@ -11,8 +11,9 @@ maintainers:
 
 properties:
   compatible:
-    items:
-      - const: samsung,exynos4210-chipid
+    enum:
+      - samsung,exynos4210-chipid
+      - samsung,exynos850-chipid
 
   reg:
     maxItems: 1

arch/arm/Kconfig

@@ -475,7 +475,6 @@ config ARCH_S3C24XX
 	select GPIOLIB
 	select GENERIC_IRQ_MULTI_HANDLER
 	select HAVE_S3C2410_I2C if I2C
-	select HAVE_S3C_RTC if RTC_CLASS
 	select NEED_MACH_IO_H
 	select S3C2410_WATCHDOG
 	select SAMSUNG_ATAGS

arch/arm/mach-exynos/Kconfig

@@ -13,7 +13,6 @@ menuconfig ARCH_EXYNOS
 	select ARM_GIC
 	select EXYNOS_IRQ_COMBINER
 	select COMMON_CLK_SAMSUNG
-	select EXYNOS_CHIPID
 	select EXYNOS_THERMAL
 	select EXYNOS_PMU
 	select EXYNOS_SROM
@@ -22,7 +21,6 @@ menuconfig ARCH_EXYNOS
 	select HAVE_ARM_ARCH_TIMER if ARCH_EXYNOS5
 	select HAVE_ARM_SCU if SMP
 	select HAVE_S3C2410_I2C if I2C
-	select HAVE_S3C_RTC if RTC_CLASS
 	select PINCTRL
 	select PINCTRL_EXYNOS
 	select PM_GENERIC_DOMAINS if PM

arch/arm/mach-s5pv210/Kconfig

@@ -13,7 +13,6 @@ config ARCH_S5PV210
 	select COMMON_CLK_SAMSUNG
 	select GPIOLIB
 	select HAVE_S3C2410_I2C if I2C
-	select HAVE_S3C_RTC if RTC_CLASS
 	select PINCTRL
 	select PINCTRL_EXYNOS
 	select SOC_SAMSUNG

arch/arm64/Kconfig.platforms

@@ -92,10 +92,8 @@ config ARCH_BRCMSTB
 config ARCH_EXYNOS
 	bool "ARMv8 based Samsung Exynos SoC family"
 	select COMMON_CLK_SAMSUNG
-	select EXYNOS_CHIPID
 	select EXYNOS_PM_DOMAINS if PM_GENERIC_DOMAINS
 	select EXYNOS_PMU
-	select HAVE_S3C_RTC if RTC_CLASS
 	select PINCTRL
 	select PINCTRL_EXYNOS
 	select PM_GENERIC_DOMAINS if PM

drivers/rtc/Kconfig

@@ -1404,16 +1404,10 @@ config RTC_DRV_OMAP
 	  This driver can also be built as a module, if so, module
 	  will be called rtc-omap.
 
-config HAVE_S3C_RTC
-	bool
-	help
-	  This will include RTC support for Samsung SoCs. If
-	  you want to include RTC support for any machine, kindly
-	  select this in the respective mach-XXXX/Kconfig file.
-
 config RTC_DRV_S3C
 	tristate "Samsung S3C series SoC RTC"
-	depends on ARCH_S3C64XX || HAVE_S3C_RTC || COMPILE_TEST
+	depends on ARCH_EXYNOS || ARCH_S3C64XX || ARCH_S3C24XX || ARCH_S5PV210 || \
+		   COMPILE_TEST
 	help
 	  RTC (Realtime Clock) driver for the clock inbuilt into the
 	  Samsung S3C24XX series of SoCs. This can provide periodic

drivers/soc/samsung/Kconfig

@@ -13,18 +13,21 @@ config EXYNOS_ASV_ARM
 	depends on EXYNOS_CHIPID
 
 config EXYNOS_CHIPID
-	bool "Exynos ChipID controller and ASV driver" if COMPILE_TEST
+	tristate "Exynos ChipID controller and ASV driver"
 	depends on ARCH_EXYNOS || COMPILE_TEST
+	default ARCH_EXYNOS
 	select EXYNOS_ASV_ARM if ARM && ARCH_EXYNOS
 	select MFD_SYSCON
 	select SOC_BUS
 	help
 	  Support for Samsung Exynos SoC ChipID and Adaptive Supply Voltage.
+	  This driver can also be built as module (exynos_chipid).
 
 config EXYNOS_PMU
 	bool "Exynos PMU controller driver" if COMPILE_TEST
 	depends on ARCH_EXYNOS || ((ARM || ARM64) && COMPILE_TEST)
 	select EXYNOS_PMU_ARM_DRIVERS if ARM && ARCH_EXYNOS
+	select MFD_CORE
 
 # There is no need to enable these drivers for ARMv8
 config EXYNOS_PMU_ARM_DRIVERS

drivers/soc/samsung/Makefile

 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_EXYNOS_ASV_ARM)	+= exynos5422-asv.o
+obj-$(CONFIG_EXYNOS_CHIPID)	+= exynos_chipid.o
+exynos_chipid-y			+= exynos-chipid.o exynos-asv.o
 
-obj-$(CONFIG_EXYNOS_CHIPID)	+= exynos-chipid.o exynos-asv.o
 obj-$(CONFIG_EXYNOS_PMU)	+= exynos-pmu.o
 
 obj-$(CONFIG_EXYNOS_PMU_ARM_DRIVERS)	+= exynos3250-pmu.o exynos4-pmu.o \

drivers/soc/samsung/exynos-chipid.c

@@ -15,7 +15,9 @@
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/mfd/syscon.h>
+#include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
@@ -24,6 +26,17 @@
 
 #include "exynos-asv.h"
 
+struct exynos_chipid_variant {
+	unsigned int rev_reg;		/* revision register offset */
+	unsigned int main_rev_shift;	/* main revision offset in rev_reg */
+	unsigned int sub_rev_shift;	/* sub revision offset in rev_reg */
+};
+
+struct exynos_chipid_info {
+	u32 product_id;
+	u32 revision;
+};
+
 static const struct exynos_soc_id {
 	const char *name;
 	unsigned int id;
@@ -42,6 +55,8 @@ static const struct exynos_soc_id {
 	{ "EXYNOS5440", 0xE5440000 },
 	{ "EXYNOS5800", 0xE5422000 },
 	{ "EXYNOS7420", 0xE7420000 },
+	{ "EXYNOS850", 0xE3830000 },
+	{ "EXYNOSAUTOV9", 0xAAA80000 },
 };
 
 static const char *product_id_to_soc_id(unsigned int product_id)
@@ -49,31 +64,57 @@ static const char *product_id_to_soc_id(unsigned int product_id)
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
-		if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
+		if (product_id == soc_ids[i].id)
 			return soc_ids[i].name;
 	return NULL;
 }
 
+static int exynos_chipid_get_chipid_info(struct regmap *regmap,
+		const struct exynos_chipid_variant *data,
+		struct exynos_chipid_info *soc_info)
+{
+	int ret;
+	unsigned int val, main_rev, sub_rev;
+
+	ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
+	if (ret < 0)
+		return ret;
+	soc_info->product_id = val & EXYNOS_MASK;
+
+	if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
+		ret = regmap_read(regmap, data->rev_reg, &val);
+		if (ret < 0)
+			return ret;
+	}
+	main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
+	sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
+	soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;
+
+	return 0;
+}
+
 static int exynos_chipid_probe(struct platform_device *pdev)
 {
+	const struct exynos_chipid_variant *drv_data;
+	struct exynos_chipid_info soc_info;
 	struct soc_device_attribute *soc_dev_attr;
 	struct soc_device *soc_dev;
 	struct device_node *root;
 	struct regmap *regmap;
-	u32 product_id;
-	u32 revision;
 	int ret;
 
+	drv_data = of_device_get_match_data(&pdev->dev);
+	if (!drv_data)
+		return -EINVAL;
+
 	regmap = device_node_to_regmap(pdev->dev.of_node);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
-	ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
+	ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
 	if (ret < 0)
 		return ret;
 
-	revision = product_id & EXYNOS_REV_MASK;
-
 	soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
 				    GFP_KERNEL);
 	if (!soc_dev_attr)
@@ -86,8 +127,8 @@ static int exynos_chipid_probe(struct platform_device *pdev)
 	of_node_put(root);
 
 	soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,
-						"%x", revision);
-	soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
+						"%x", soc_info.revision);
+	soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);
 	if (!soc_dev_attr->soc_id) {
 		pr_err("Unknown SoC\n");
 		return -ENODEV;
@@ -104,9 +145,8 @@ static int exynos_chipid_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, soc_dev);
 
-	dev_info(soc_device_to_device(soc_dev),
-		 "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
-		 soc_dev_attr->soc_id, product_id, revision);
+	dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
+		 soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision);
 
 	return 0;
 
@@ -125,10 +165,29 @@ static int exynos_chipid_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
+	.rev_reg	= 0x0,
+	.main_rev_shift	= 4,
+	.sub_rev_shift	= 0,
+};
+
+static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
+	.rev_reg	= 0x10,
+	.main_rev_shift	= 20,
+	.sub_rev_shift	= 16,
+};
+
 static const struct of_device_id exynos_chipid_of_device_ids[] = {
-	{ .compatible = "samsung,exynos4210-chipid" },
-	{}
+	{
+		.compatible	= "samsung,exynos4210-chipid",
+		.data		= &exynos4210_chipid_drv_data,
+	}, {
+		.compatible	= "samsung,exynos850-chipid",
+		.data		= &exynos850_chipid_drv_data,
+	},
+	{ }
 };
+MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
 
 static struct platform_driver exynos_chipid_driver = {
 	.driver = {
@@ -138,4 +197,11 @@ static struct platform_driver exynos_chipid_driver = {
 	.probe	= exynos_chipid_probe,
 	.remove	= exynos_chipid_remove,
 };
-builtin_platform_driver(exynos_chipid_driver);
+module_platform_driver(exynos_chipid_driver);
+
+MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
+MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>");
+MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
+MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
+MODULE_LICENSE("GPL");

drivers/soc/samsung/exynos5422-asv.c

@@ -503,3 +503,4 @@ int exynos5422_asv_init(struct exynos_asv *asv)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(exynos5422_asv_init);

drivers/soc/samsung/pm_domains.c

@@ -28,7 +28,6 @@ struct exynos_pm_domain_config {
  */
 struct exynos_pm_domain {
 	void __iomem *base;
-	bool is_off;
 	struct generic_pm_domain pd;
 	u32 local_pwr_cfg;
 };

include/linux/soc/samsung/exynos-chipid.h

@@ -9,10 +9,8 @@
 #define __LINUX_SOC_EXYNOS_CHIPID_H
 
 #define EXYNOS_CHIPID_REG_PRO_ID	0x00
-#define EXYNOS_SUBREV_MASK		(0xf << 4)
-#define EXYNOS_MAINREV_MASK		(0xf << 0)
-#define EXYNOS_REV_MASK			(EXYNOS_SUBREV_MASK | \
-					 EXYNOS_MAINREV_MASK)
+#define EXYNOS_REV_PART_MASK		0xf
+#define EXYNOS_REV_PART_SHIFT		4
 #define EXYNOS_MASK			0xfffff000
 
 #define EXYNOS_CHIPID_REG_PKG_ID	0x04