Merge tag 'rtc-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "Subsystem:
   - remove .open() and .release() RTC ops
   - constify i2c_device_id

  New driver:
   - Realtek RTD1295
   - Android emulator (goldfish) RTC

  Drivers:
   - ds1307: Beginning of a huge cleanup
   - s35390a: handle invalid RTC time
   - sun6i: external oscillator gate support"

* tag 'rtc-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (40 commits)
  rtc: ds1307: use octal permissions
  rtc: ds1307: fix braces
  rtc: ds1307: fix alignments and blank lines
  rtc: ds1307: use BIT
  rtc: ds1307: use u32
  rtc: ds1307: use sizeof
  rtc: ds1307: remove regs member
  rtc: Add Realtek RTD1295
  dt-bindings: rtc: Add Realtek RTD1295
  rtc: sun6i: Add support for the external oscillator gate
  rtc: goldfish: Add RTC driver for Android emulator
  dt-bindings: Add device tree binding for Goldfish RTC driver
  rtc: ds1307: add basic support for ds1341 chip
  rtc: ds1307: remove member nvram_offset from struct ds1307
  rtc: ds1307: factor out offset to struct chip_desc
  rtc: ds1307: factor out rtc_ops to struct chip_desc
  rtc: ds1307: factor out irq_handler to struct chip_desc
  rtc: ds1307: improve irq setup
  rtc: ds1307: constify struct chip_desc variables
  rtc: ds1307: improve trickle charger initialization
  ...

Documentation/devicetree/bindings/power/wakeup-source.txt

@@ -20,13 +20,12 @@ List of legacy properties and respective binding document
 1. "enable-sdio-wakeup"		Documentation/devicetree/bindings/mmc/mmc.txt
 2. "gpio-key,wakeup"		Documentation/devicetree/bindings/input/gpio-keys{,-polled}.txt
 3. "has-tpo"			Documentation/devicetree/bindings/rtc/rtc-opal.txt
-4. "isil,irq2-can-wakeup-machine" Documentation/devicetree/bindings/rtc/isil,isl12057.txt
-5. "linux,wakeup"		Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
+4. "linux,wakeup"		Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
 				Documentation/devicetree/bindings/mfd/tc3589x.txt
 				Documentation/devicetree/bindings/input/ads7846.txt
-6. "linux,keypad-wakeup"	Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt
-7. "linux,input-wakeup"		Documentation/devicetree/bindings/input/samsung-keypad.txt
-8. "nvidia,wakeup-source"	Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt
+5. "linux,keypad-wakeup"	Documentation/devicetree/bindings/input/qcom,pm8xxx-keypad.txt
+6. "linux,input-wakeup"		Documentation/devicetree/bindings/input/samsung-keypad.txt
+7. "nvidia,wakeup-source"	Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt
 
 Examples
 --------

Documentation/devicetree/bindings/rtc/google,goldfish-rtc.txt

@@ -0,0 +1,17 @@
+Android Goldfish RTC
+
+Android Goldfish RTC device used by Android emulator.
+
+Required properties:
+
+- compatible : should contain "google,goldfish-rtc"
+- reg        : <registers mapping>
+- interrupts : <interrupt mapping>
+
+Example:
+
+	goldfish_timer@9020000 {
+		compatible = "google,goldfish-rtc";
+		reg = <0x9020000 0x1000>;
+		interrupts = <0x3>;
+	};

Documentation/devicetree/bindings/rtc/isil,isl12057.txt

@@ -24,7 +24,6 @@ Optional properties:
 
  - "wakeup-source": mark the chip as a wakeup source, independently of
     the availability of an IRQ line connected to the SoC.
-    (Legacy property supported: "isil,irq2-can-wakeup-machine")
 
  - "interrupt-parent", "interrupts": for passing the interrupt line
    of the SoC connected to IRQ#2 of the RTC chip.

Documentation/devicetree/bindings/rtc/realtek,rtd119x.txt

@@ -0,0 +1,16 @@
+Realtek RTD129x Real-Time Clock
+===============================
+
+Required properties:
+- compatible :  Should be "realtek,rtd1295-rtc"
+- reg        :  Specifies the physical base address and size
+- clocks     :  Specifies the clock gate
+
+
+Example:
+
+	rtc@9801b600 {
+		compatible = "realtek,rtd1295-clk";
+		reg = <0x9801b600 0x100>;
+		clocks = <&clkc RTD1295_CLK_EN_MISC_RTC>;
+	};

Documentation/devicetree/bindings/rtc/sun6i-rtc.txt

@@ -10,7 +10,7 @@ Required properties:
 
 Required properties for new device trees
 - clocks	: phandle to the 32kHz external oscillator
-- clock-output-names : name of the LOSC clock created
+- clock-output-names : names of the LOSC and its external output clocks created
 - #clock-cells  : must be equals to 1. The RTC provides two clocks: the
 		  LOSC and its external output, with index 0 and 1
 		  respectively.
@@ -21,7 +21,7 @@ rtc: rtc@01f00000 {
 	compatible = "allwinner,sun6i-a31-rtc";
 	reg = <0x01f00000 0x54>;
 	interrupts = <0 40 4>, <0 41 4>;
-	clock-output-names = "osc32k";
+	clock-output-names = "osc32k", "osc32k-out";
 	clocks = <&ext_osc32k>;
 	#clock-cells = <1>;
 };

MAINTAINERS

@@ -855,6 +855,12 @@ S:	Supported
 F:	drivers/android/
 F:	drivers/staging/android/
 
+ANDROID GOLDFISH RTC DRIVER
+M:	Miodrag Dinic <miodrag.dinic@imgtec.com>
+S:	Supported
+F:	Documentation/devicetree/bindings/rtc/google,goldfish-rtc.txt
+F:	drivers/rtc/rtc-goldfish.c
+
 ANDROID ION DRIVER
 M:	Laura Abbott <labbott@redhat.com>
 M:	Sumit Semwal <sumit.semwal@linaro.org>

drivers/rtc/Kconfig

@@ -227,14 +227,14 @@ config RTC_DRV_AS3722
 	  will be called rtc-as3722.
 
 config RTC_DRV_DS1307
-	tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025, ISL12057"
+	tristate "Dallas/Maxim DS1307/37/38/39/40/41, ST M41T00, EPSON RX-8025, ISL12057"
 	help
 	  If you say yes here you get support for various compatible RTC
 	  chips (often with battery backup) connected with I2C. This driver
-	  should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
-	  EPSON RX-8025, Intersil ISL12057 and probably other chips. In some
-	  cases the RTC must already have been initialized (by manufacturing or
-	  a bootloader).
+	  should handle DS1307, DS1337, DS1338, DS1339, DS1340, DS1341,
+	  ST M41T00, EPSON RX-8025, Intersil ISL12057 and probably other chips.
+	  In some cases the RTC must already have been initialized (by
+	  manufacturing or a bootloader).
 
 	  The first seven registers on these chips hold an RTC, and other
 	  registers may add features such as NVRAM, a trickle charger for
@@ -371,11 +371,11 @@ config RTC_DRV_MAX77686
 	  will be called rtc-max77686.
 
 config RTC_DRV_RK808
-	tristate "Rockchip RK808/RK818 RTC"
+	tristate "Rockchip RK805/RK808/RK818 RTC"
 	depends on MFD_RK808
 	help
 	  If you say yes here you will get support for the
-	  RTC of RK808 and RK818 PMIC.
+	  RTC of RK805, RK808 and RK818 PMIC.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called rk808-rtc.
@@ -1765,6 +1765,14 @@ config RTC_DRV_CPCAP
 	   Say y here for CPCAP rtc found on some Motorola phones
 	   and tablets such as Droid 4.
 
+config RTC_DRV_RTD119X
+	bool "Realtek RTD129x RTC"
+	depends on ARCH_REALTEK || COMPILE_TEST
+	default ARCH_REALTEK
+	help
+	  If you say yes here, you get support for the RTD1295 SoC
+	  Real Time Clock.
+
 comment "HID Sensor RTC drivers"
 
 config RTC_DRV_HID_SENSOR_TIME
@@ -1780,5 +1788,13 @@ config RTC_DRV_HID_SENSOR_TIME
 	  If this driver is compiled as a module, it will be named
 	  rtc-hid-sensor-time.
 
+config RTC_DRV_GOLDFISH
+	tristate "Goldfish Real Time Clock"
+	depends on MIPS && (GOLDFISH || COMPILE_TEST)
+	help
+	  Say yes to enable RTC driver for the Goldfish based virtual platform.
+
+	  Goldfish is a code name for the virtual platform developed by Google
+	  for Android emulation.
 
 endif # RTC_CLASS

drivers/rtc/Makefile

@@ -131,6 +131,7 @@ obj-$(CONFIG_RTC_DRV_RP5C01)	+= rtc-rp5c01.o
 obj-$(CONFIG_RTC_DRV_RS5C313)	+= rtc-rs5c313.o
 obj-$(CONFIG_RTC_DRV_RS5C348)	+= rtc-rs5c348.o
 obj-$(CONFIG_RTC_DRV_RS5C372)	+= rtc-rs5c372.o
+obj-$(CONFIG_RTC_DRV_RTD119X)	+= rtc-rtd119x.o
 obj-$(CONFIG_RTC_DRV_RV3029C2)	+= rtc-rv3029c2.o
 obj-$(CONFIG_RTC_DRV_RV8803)	+= rtc-rv8803.o
 obj-$(CONFIG_RTC_DRV_RX4581)	+= rtc-rx4581.o
@@ -170,3 +171,4 @@ obj-$(CONFIG_RTC_DRV_WM8350)	+= rtc-wm8350.o
 obj-$(CONFIG_RTC_DRV_X1205)	+= rtc-x1205.o
 obj-$(CONFIG_RTC_DRV_XGENE)	+= rtc-xgene.o
 obj-$(CONFIG_RTC_DRV_ZYNQMP)	+= rtc-zynqmp.o
+obj-$(CONFIG_RTC_DRV_GOLDFISH)	+= rtc-goldfish.o

drivers/rtc/rtc-dev.c

@@ -24,28 +24,19 @@ static dev_t rtc_devt;
 
 static int rtc_dev_open(struct inode *inode, struct file *file)
 {
-	int err;
 	struct rtc_device *rtc = container_of(inode->i_cdev,
 					struct rtc_device, char_dev);
-	const struct rtc_class_ops *ops = rtc->ops;
 
 	if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
 		return -EBUSY;
 
 	file->private_data = rtc;
 
-	err = ops->open ? ops->open(rtc->dev.parent) : 0;
-	if (err == 0) {
-		spin_lock_irq(&rtc->irq_lock);
-		rtc->irq_data = 0;
-		spin_unlock_irq(&rtc->irq_lock);
-
-		return 0;
-	}
+	spin_lock_irq(&rtc->irq_lock);
+	rtc->irq_data = 0;
+	spin_unlock_irq(&rtc->irq_lock);
 
-	/* something has gone wrong */
-	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
-	return err;
+	return 0;
 }
 
 #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
@@ -438,9 +429,6 @@ static int rtc_dev_release(struct inode *inode, struct file *file)
 	rtc_update_irq_enable(rtc, 0);
 	rtc_irq_set_state(rtc, NULL, 0);
 
-	if (rtc->ops->release)
-		rtc->ops->release(rtc->dev.parent);
-
 	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
 	return 0;
 }

drivers/rtc/rtc-ds1307.c

@@ -39,6 +39,7 @@ enum ds_type {
 	ds_1338,
 	ds_1339,
 	ds_1340,
+	ds_1341,
 	ds_1388,
 	ds_3231,
 	m41t0,
@@ -50,7 +51,6 @@ enum ds_type {
 	/* rs5c372 too?  different address... */
 };
 
-
 /* RTC registers don't differ much, except for the century flag */
 #define DS1307_REG_SECS		0x00	/* 00-59 */
 #	define DS1307_BIT_CH		0x80
@@ -113,11 +113,7 @@ enum ds_type {
 #	define RX8025_BIT_VDET		0x40
 #	define RX8025_BIT_XST		0x20
 
-
 struct ds1307 {
-	u8			offset; /* register's offset */
-	u8			regs[11];
-	u16			nvram_offset;
 	struct nvmem_config	nvmem_cfg;
 	enum ds_type		type;
 	unsigned long		flags;
@@ -126,7 +122,6 @@ struct ds1307 {
 	struct device		*dev;
 	struct regmap		*regmap;
 	const char		*name;
-	int			irq;
 	struct rtc_device	*rtc;
 #ifdef CONFIG_COMMON_CLK
 	struct clk_hw		clks[2];
@@ -137,18 +132,47 @@ struct chip_desc {
 	unsigned		alarm:1;
 	u16			nvram_offset;
 	u16			nvram_size;
+	u8			offset; /* register's offset */
 	u8			century_reg;
 	u8			century_enable_bit;
 	u8			century_bit;
+	u8			bbsqi_bit;
+	irq_handler_t		irq_handler;
+	const struct rtc_class_ops *rtc_ops;
 	u16			trickle_charger_reg;
-	u8			trickle_charger_setup;
-	u8			(*do_trickle_setup)(struct ds1307 *, uint32_t,
+	u8			(*do_trickle_setup)(struct ds1307 *, u32,
 						    bool);
 };
 
-static u8 do_trickle_setup_ds1339(struct ds1307 *, uint32_t ohms, bool diode);
+static int ds1307_get_time(struct device *dev, struct rtc_time *t);
+static int ds1307_set_time(struct device *dev, struct rtc_time *t);
+static u8 do_trickle_setup_ds1339(struct ds1307 *, u32 ohms, bool diode);
+static irqreturn_t rx8130_irq(int irq, void *dev_id);
+static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled);
+static irqreturn_t mcp794xx_irq(int irq, void *dev_id);
+static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled);
 
-static struct chip_desc chips[last_ds_type] = {
+static const struct rtc_class_ops rx8130_rtc_ops = {
+	.read_time      = ds1307_get_time,
+	.set_time       = ds1307_set_time,
+	.read_alarm     = rx8130_read_alarm,
+	.set_alarm      = rx8130_set_alarm,
+	.alarm_irq_enable = rx8130_alarm_irq_enable,
+};
+
+static const struct rtc_class_ops mcp794xx_rtc_ops = {
+	.read_time      = ds1307_get_time,
+	.set_time       = ds1307_set_time,
+	.read_alarm     = mcp794xx_read_alarm,
+	.set_alarm      = mcp794xx_set_alarm,
+	.alarm_irq_enable = mcp794xx_alarm_irq_enable,
+};
+
+static const struct chip_desc chips[last_ds_type] = {
 	[ds_1307] = {
 		.nvram_offset	= 8,
 		.nvram_size	= 56,
@@ -170,6 +194,7 @@ static struct chip_desc chips[last_ds_type] = {
 		.alarm		= 1,
 		.century_reg	= DS1307_REG_MONTH,
 		.century_bit	= DS1337_BIT_CENTURY,
+		.bbsqi_bit	= DS1339_BIT_BBSQI,
 		.trickle_charger_reg = 0x10,
 		.do_trickle_setup = &do_trickle_setup_ds1339,
 	},
@@ -179,25 +204,36 @@ static struct chip_desc chips[last_ds_type] = {
 		.century_bit	= DS1340_BIT_CENTURY,
 		.trickle_charger_reg = 0x08,
 	},
+	[ds_1341] = {
+		.century_reg	= DS1307_REG_MONTH,
+		.century_bit	= DS1337_BIT_CENTURY,
+	},
 	[ds_1388] = {
+		.offset		= 1,
 		.trickle_charger_reg = 0x0a,
 	},
 	[ds_3231] = {
 		.alarm		= 1,
 		.century_reg	= DS1307_REG_MONTH,
 		.century_bit	= DS1337_BIT_CENTURY,
+		.bbsqi_bit	= DS3231_BIT_BBSQW,
 	},
 	[rx_8130] = {
 		.alarm		= 1,
 		/* this is battery backed SRAM */
 		.nvram_offset	= 0x20,
 		.nvram_size	= 4,	/* 32bit (4 word x 8 bit) */
+		.offset		= 0x10,
+		.irq_handler = rx8130_irq,
+		.rtc_ops = &rx8130_rtc_ops,
 	},
 	[mcp794xx] = {
 		.alarm		= 1,
 		/* this is battery backed SRAM */
 		.nvram_offset	= 0x20,
 		.nvram_size	= 0x40,
+		.irq_handler = mcp794xx_irq,
+		.rtc_ops = &mcp794xx_rtc_ops,
 	},
 };
 
@@ -209,6 +245,7 @@ static const struct i2c_device_id ds1307_id[] = {
 	{ "ds1339", ds_1339 },
 	{ "ds1388", ds_1388 },
 	{ "ds1340", ds_1340 },
+	{ "ds1341", ds_1341 },
 	{ "ds3231", ds_3231 },
 	{ "m41t0", m41t0 },
 	{ "m41t00", m41t00 },
@@ -252,6 +289,10 @@ static const struct of_device_id ds1307_of_match[] = {
 		.compatible = "dallas,ds1340",
 		.data = (void *)ds_1340
 	},
+	{
+		.compatible = "dallas,ds1341",
+		.data = (void *)ds_1341
+	},
 	{
 		.compatible = "maxim,ds3231",
 		.data = (void *)ds_3231
@@ -298,6 +339,7 @@ static const struct acpi_device_id ds1307_acpi_ids[] = {
 	{ .id = "DS1339", .driver_data = ds_1339 },
 	{ .id = "DS1388", .driver_data = ds_1388 },
 	{ .id = "DS1340", .driver_data = ds_1340 },
+	{ .id = "DS1341", .driver_data = ds_1341 },
 	{ .id = "DS3231", .driver_data = ds_3231 },
 	{ .id = "M41T0", .driver_data = m41t0 },
 	{ .id = "M41T00", .driver_data = m41t00 },
@@ -352,34 +394,36 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
 	struct ds1307	*ds1307 = dev_get_drvdata(dev);
 	int		tmp, ret;
 	const struct chip_desc *chip = &chips[ds1307->type];
+	u8 regs[7];
 
 	/* read the RTC date and time registers all at once */
-	ret = regmap_bulk_read(ds1307->regmap, ds1307->offset, ds1307->regs, 7);
+	ret = regmap_bulk_read(ds1307->regmap, chip->offset, regs,
+			       sizeof(regs));
 	if (ret) {
 		dev_err(dev, "%s error %d\n", "read", ret);
 		return ret;
 	}
 
-	dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs);
+	dev_dbg(dev, "%s: %7ph\n", "read", regs);
 
 	/* if oscillator fail bit is set, no data can be trusted */
 	if (ds1307->type == m41t0 &&
-	    ds1307->regs[DS1307_REG_MIN] & M41T0_BIT_OF) {
+	    regs[DS1307_REG_MIN] & M41T0_BIT_OF) {
 		dev_warn_once(dev, "oscillator failed, set time!\n");
 		return -EINVAL;
 	}
 
-	t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f);
-	t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f);
-	tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f;
+	t->tm_sec = bcd2bin(regs[DS1307_REG_SECS] & 0x7f);
+	t->tm_min = bcd2bin(regs[DS1307_REG_MIN] & 0x7f);
+	tmp = regs[DS1307_REG_HOUR] & 0x3f;
 	t->tm_hour = bcd2bin(tmp);
-	t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1;
-	t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f);
-	tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f;
+	t->tm_wday = bcd2bin(regs[DS1307_REG_WDAY] & 0x07) - 1;
+	t->tm_mday = bcd2bin(regs[DS1307_REG_MDAY] & 0x3f);
+	tmp = regs[DS1307_REG_MONTH] & 0x1f;
 	t->tm_mon = bcd2bin(tmp) - 1;
-	t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
+	t->tm_year = bcd2bin(regs[DS1307_REG_YEAR]) + 100;
 
-	if (ds1307->regs[chip->century_reg] & chip->century_bit &&
+	if (regs[chip->century_reg] & chip->century_bit &&
 	    IS_ENABLED(CONFIG_RTC_DRV_DS1307_CENTURY))
 		t->tm_year += 100;
 
@@ -399,7 +443,7 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 	const struct chip_desc *chip = &chips[ds1307->type];
 	int		result;
 	int		tmp;
-	u8		*buf = ds1307->regs;
+	u8		regs[7];
 
 	dev_dbg(dev, "%s secs=%d, mins=%d, "
 		"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
@@ -418,35 +462,36 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 		return -EINVAL;
 #endif
 
-	buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
-	buf[DS1307_REG_MIN] = bin2bcd(t->tm_min);
-	buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
-	buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1);
-	buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday);
-	buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1);
+	regs[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
+	regs[DS1307_REG_MIN] = bin2bcd(t->tm_min);
+	regs[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
+	regs[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1);
+	regs[DS1307_REG_MDAY] = bin2bcd(t->tm_mday);
+	regs[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1);
 
 	/* assume 20YY not 19YY */
 	tmp = t->tm_year - 100;
-	buf[DS1307_REG_YEAR] = bin2bcd(tmp);
+	regs[DS1307_REG_YEAR] = bin2bcd(tmp);
 
 	if (chip->century_enable_bit)
-		buf[chip->century_reg] |= chip->century_enable_bit;
+		regs[chip->century_reg] |= chip->century_enable_bit;
 	if (t->tm_year > 199 && chip->century_bit)
-		buf[chip->century_reg] |= chip->century_bit;
+		regs[chip->century_reg] |= chip->century_bit;
 
 	if (ds1307->type == mcp794xx) {
 		/*
 		 * these bits were cleared when preparing the date/time
 		 * values and need to be set again before writing the
-		 * buffer out to the device.
+		 * regsfer out to the device.
 		 */
-		buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
-		buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
+		regs[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
+		regs[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
 	}
 
-	dev_dbg(dev, "%s: %7ph\n", "write", buf);
+	dev_dbg(dev, "%s: %7ph\n", "write", regs);
 
-	result = regmap_bulk_write(ds1307->regmap, ds1307->offset, buf, 7);
+	result = regmap_bulk_write(ds1307->regmap, chip->offset, regs,
+				   sizeof(regs));
 	if (result) {
 		dev_err(dev, "%s error %d\n", "write", result);
 		return result;
@@ -458,33 +503,34 @@ static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct ds1307		*ds1307 = dev_get_drvdata(dev);
 	int			ret;
+	u8			regs[9];
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
 	/* read all ALARM1, ALARM2, and status registers at once */
 	ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS,
-			       ds1307->regs, 9);
+			       regs, sizeof(regs));
 	if (ret) {
 		dev_err(dev, "%s error %d\n", "alarm read", ret);
 		return ret;
 	}
 
 	dev_dbg(dev, "%s: %4ph, %3ph, %2ph\n", "alarm read",
-		&ds1307->regs[0], &ds1307->regs[4], &ds1307->regs[7]);
+		&regs[0], &regs[4], &regs[7]);
 
 	/*
 	 * report alarm time (ALARM1); assume 24 hour and day-of-month modes,
 	 * and that all four fields are checked matches
 	 */
-	t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f);
-	t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f);
-	t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f);
-	t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f);
+	t->time.tm_sec = bcd2bin(regs[0] & 0x7f);
+	t->time.tm_min = bcd2bin(regs[1] & 0x7f);
+	t->time.tm_hour = bcd2bin(regs[2] & 0x3f);
+	t->time.tm_mday = bcd2bin(regs[3] & 0x3f);
 
 	/* ... and status */
-	t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE);
-	t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I);
+	t->enabled = !!(regs[7] & DS1337_BIT_A1IE);
+	t->pending = !!(regs[8] & DS1337_BIT_A1I);
 
 	dev_dbg(dev, "%s secs=%d, mins=%d, "
 		"hours=%d, mday=%d, enabled=%d, pending=%d\n",
@@ -498,7 +544,7 @@ static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct ds1307		*ds1307 = dev_get_drvdata(dev);
-	unsigned char		*buf = ds1307->regs;
+	unsigned char		regs[9];
 	u8			control, status;
 	int			ret;
 
@@ -512,33 +558,35 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* read current status of both alarms and the chip */
-	ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS, buf, 9);
+	ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS, regs,
+			       sizeof(regs));
 	if (ret) {
 		dev_err(dev, "%s error %d\n", "alarm write", ret);
 		return ret;
 	}
-	control = ds1307->regs[7];
-	status = ds1307->regs[8];
+	control = regs[7];
+	status = regs[8];
 
 	dev_dbg(dev, "%s: %4ph, %3ph, %02x %02x\n", "alarm set (old status)",
-		&ds1307->regs[0], &ds1307->regs[4], control, status);
+		&regs[0], &regs[4], control, status);
 
 	/* set ALARM1, using 24 hour and day-of-month modes */
-	buf[0] = bin2bcd(t->time.tm_sec);
-	buf[1] = bin2bcd(t->time.tm_min);
-	buf[2] = bin2bcd(t->time.tm_hour);
-	buf[3] = bin2bcd(t->time.tm_mday);
+	regs[0] = bin2bcd(t->time.tm_sec);
+	regs[1] = bin2bcd(t->time.tm_min);
+	regs[2] = bin2bcd(t->time.tm_hour);
+	regs[3] = bin2bcd(t->time.tm_mday);
 
 	/* set ALARM2 to non-garbage */
-	buf[4] = 0;
-	buf[5] = 0;
-	buf[6] = 0;
+	regs[4] = 0;
+	regs[5] = 0;
+	regs[6] = 0;
 
 	/* disable alarms */
-	buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
-	buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
+	regs[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
+	regs[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
 
-	ret = regmap_bulk_write(ds1307->regmap, DS1339_REG_ALARM1_SECS, buf, 9);
+	ret = regmap_bulk_write(ds1307->regmap, DS1339_REG_ALARM1_SECS, regs,
+				sizeof(regs));
 	if (ret) {
 		dev_err(dev, "can't set alarm time\n");
 		return ret;
@@ -547,8 +595,8 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	/* optionally enable ALARM1 */
 	if (t->enabled) {
 		dev_dbg(dev, "alarm IRQ armed\n");
-		buf[7] |= DS1337_BIT_A1IE;	/* only ALARM1 is used */
-		regmap_write(ds1307->regmap, DS1337_REG_CONTROL, buf[7]);
+		regs[7] |= DS1337_BIT_A1IE;	/* only ALARM1 is used */
+		regmap_write(ds1307->regmap, DS1337_REG_CONTROL, regs[7]);
 	}
 
 	return 0;
@@ -584,11 +632,11 @@ static const struct rtc_class_ops ds13xx_rtc_ops = {
 #define RX8130_REG_ALARM_HOUR		0x08
 #define RX8130_REG_ALARM_WEEK_OR_DAY	0x09
 #define RX8130_REG_EXTENSION		0x0c
-#define RX8130_REG_EXTENSION_WADA	(1 << 3)
+#define RX8130_REG_EXTENSION_WADA	BIT(3)
 #define RX8130_REG_FLAG			0x0d
-#define RX8130_REG_FLAG_AF		(1 << 3)
+#define RX8130_REG_FLAG_AF		BIT(3)
 #define RX8130_REG_CONTROL0		0x0e
-#define RX8130_REG_CONTROL0_AIE		(1 << 3)
+#define RX8130_REG_CONTROL0_AIE		BIT(3)
 
 static irqreturn_t rx8130_irq(int irq, void *dev_id)
 {
@@ -600,7 +648,8 @@ static irqreturn_t rx8130_irq(int irq, void *dev_id)
 	mutex_lock(lock);
 
 	/* Read control registers. */
-	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+			       sizeof(ctl));
 	if (ret < 0)
 		goto out;
 	if (!(ctl[1] & RX8130_REG_FLAG_AF))
@@ -608,7 +657,8 @@ static irqreturn_t rx8130_irq(int irq, void *dev_id)
 	ctl[1] &= ~RX8130_REG_FLAG_AF;
 	ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
 
-	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+				sizeof(ctl));
 	if (ret < 0)
 		goto out;
 
@@ -630,12 +680,14 @@ static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 		return -EINVAL;
 
 	/* Read alarm registers. */
-	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3);
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald,
+			       sizeof(ald));
 	if (ret < 0)
 		return ret;
 
 	/* Read control registers. */
-	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+			       sizeof(ctl));
 	if (ret < 0)
 		return ret;
 
@@ -676,7 +728,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* Read control registers. */
-	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+			       sizeof(ctl));
 	if (ret < 0)
 		return ret;
 
@@ -684,7 +737,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	ctl[1] |= RX8130_REG_FLAG_AF;
 	ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
 
-	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+				sizeof(ctl));
 	if (ret < 0)
 		return ret;
 
@@ -693,7 +747,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	ald[1] = bin2bcd(t->time.tm_hour);
 	ald[2] = bin2bcd(t->time.tm_mday);
 
-	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3);
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald,
+				sizeof(ald));
 	if (ret < 0)
 		return ret;
 
@@ -702,7 +757,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 
 	ctl[2] |= RX8130_REG_CONTROL0_AIE;
 
-	return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+				 sizeof(ctl));
 }
 
 static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
@@ -725,14 +781,6 @@ static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
 	return regmap_write(ds1307->regmap, RX8130_REG_CONTROL0, reg);
 }
 
-static const struct rtc_class_ops rx8130_rtc_ops = {
-	.read_time	= ds1307_get_time,
-	.set_time	= ds1307_set_time,
-	.read_alarm	= rx8130_read_alarm,
-	.set_alarm	= rx8130_set_alarm,
-	.alarm_irq_enable = rx8130_alarm_irq_enable,
-};
-
 /*----------------------------------------------------------------------*/
 
 /*
@@ -748,11 +796,11 @@ static const struct rtc_class_ops rx8130_rtc_ops = {
 #define MCP794XX_REG_ALARM0_CTRL	0x0d
 #define MCP794XX_REG_ALARM1_BASE	0x11
 #define MCP794XX_REG_ALARM1_CTRL	0x14
-#	define MCP794XX_BIT_ALMX_IF	(1 << 3)
-#	define MCP794XX_BIT_ALMX_C0	(1 << 4)
-#	define MCP794XX_BIT_ALMX_C1	(1 << 5)
-#	define MCP794XX_BIT_ALMX_C2	(1 << 6)
-#	define MCP794XX_BIT_ALMX_POL	(1 << 7)
+#	define MCP794XX_BIT_ALMX_IF	BIT(3)
+#	define MCP794XX_BIT_ALMX_C0	BIT(4)
+#	define MCP794XX_BIT_ALMX_C1	BIT(5)
+#	define MCP794XX_BIT_ALMX_C2	BIT(6)
+#	define MCP794XX_BIT_ALMX_POL	BIT(7)
 #	define MCP794XX_MSK_ALMX_MATCH	(MCP794XX_BIT_ALMX_C0 | \
 					 MCP794XX_BIT_ALMX_C1 | \
 					 MCP794XX_BIT_ALMX_C2)
@@ -793,37 +841,38 @@ out:
 static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct ds1307 *ds1307 = dev_get_drvdata(dev);
-	u8 *regs = ds1307->regs;
+	u8 regs[10];
 	int ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
 	/* Read control and alarm 0 registers. */
-	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
+			       sizeof(regs));
 	if (ret)
 		return ret;
 
 	t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN);
 
 	/* Report alarm 0 time assuming 24-hour and day-of-month modes. */
-	t->time.tm_sec = bcd2bin(ds1307->regs[3] & 0x7f);
-	t->time.tm_min = bcd2bin(ds1307->regs[4] & 0x7f);
-	t->time.tm_hour = bcd2bin(ds1307->regs[5] & 0x3f);
-	t->time.tm_wday = bcd2bin(ds1307->regs[6] & 0x7) - 1;
-	t->time.tm_mday = bcd2bin(ds1307->regs[7] & 0x3f);
-	t->time.tm_mon = bcd2bin(ds1307->regs[8] & 0x1f) - 1;
+	t->time.tm_sec = bcd2bin(regs[3] & 0x7f);
+	t->time.tm_min = bcd2bin(regs[4] & 0x7f);
+	t->time.tm_hour = bcd2bin(regs[5] & 0x3f);
+	t->time.tm_wday = bcd2bin(regs[6] & 0x7) - 1;
+	t->time.tm_mday = bcd2bin(regs[7] & 0x3f);
+	t->time.tm_mon = bcd2bin(regs[8] & 0x1f) - 1;
 	t->time.tm_year = -1;
 	t->time.tm_yday = -1;
 	t->time.tm_isdst = -1;
 
 	dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
-		"enabled=%d polarity=%d irq=%d match=%d\n", __func__,
+		"enabled=%d polarity=%d irq=%d match=%lu\n", __func__,
 		t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
 		t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled,
-		!!(ds1307->regs[6] & MCP794XX_BIT_ALMX_POL),
-		!!(ds1307->regs[6] & MCP794XX_BIT_ALMX_IF),
-		(ds1307->regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4);
+		!!(regs[6] & MCP794XX_BIT_ALMX_POL),
+		!!(regs[6] & MCP794XX_BIT_ALMX_IF),
+		(regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4);
 
 	return 0;
 }
@@ -831,7 +880,7 @@ static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct ds1307 *ds1307 = dev_get_drvdata(dev);
-	unsigned char *regs = ds1307->regs;
+	unsigned char regs[10];
 	int ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
@@ -844,7 +893,8 @@ static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* Read control and alarm 0 registers. */
-	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
+			       sizeof(regs));
 	if (ret)
 		return ret;
 
@@ -863,7 +913,8 @@ static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	/* Disable interrupt. We will not enable until completely programmed */
 	regs[0] &= ~MCP794XX_BIT_ALM0_EN;
 
-	ret = regmap_bulk_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	ret = regmap_bulk_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
+				sizeof(regs));
 	if (ret)
 		return ret;
 
@@ -885,22 +936,15 @@ static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
 				  enabled ? MCP794XX_BIT_ALM0_EN : 0);
 }
 
-static const struct rtc_class_ops mcp794xx_rtc_ops = {
-	.read_time	= ds1307_get_time,
-	.set_time	= ds1307_set_time,
-	.read_alarm	= mcp794xx_read_alarm,
-	.set_alarm	= mcp794xx_set_alarm,
-	.alarm_irq_enable = mcp794xx_alarm_irq_enable,
-};
-
 /*----------------------------------------------------------------------*/
 
 static int ds1307_nvram_read(void *priv, unsigned int offset, void *val,
 			     size_t bytes)
 {
 	struct ds1307 *ds1307 = priv;
+	const struct chip_desc *chip = &chips[ds1307->type];
 
-	return regmap_bulk_read(ds1307->regmap, ds1307->nvram_offset + offset,
+	return regmap_bulk_read(ds1307->regmap, chip->nvram_offset + offset,
 				val, bytes);
 }
 
@@ -908,15 +952,16 @@ static int ds1307_nvram_write(void *priv, unsigned int offset, void *val,
 			      size_t bytes)
 {
 	struct ds1307 *ds1307 = priv;
+	const struct chip_desc *chip = &chips[ds1307->type];
 
-	return regmap_bulk_write(ds1307->regmap, ds1307->nvram_offset + offset,
+	return regmap_bulk_write(ds1307->regmap, chip->nvram_offset + offset,
 				 val, bytes);
 }
 
 /*----------------------------------------------------------------------*/
 
 static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307,
-				  uint32_t ohms, bool diode)
+				  u32 ohms, bool diode)
 {
 	u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE :
 		DS1307_TRICKLE_CHARGER_NO_DIODE;
@@ -939,23 +984,23 @@ static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307,
 	return setup;
 }
 
-static void ds1307_trickle_init(struct ds1307 *ds1307,
-				struct chip_desc *chip)
+static u8 ds1307_trickle_init(struct ds1307 *ds1307,
+			      const struct chip_desc *chip)
 {
-	uint32_t ohms = 0;
+	u32 ohms;
 	bool diode = true;
 
 	if (!chip->do_trickle_setup)
-		goto out;
+		return 0;
+
 	if (device_property_read_u32(ds1307->dev, "trickle-resistor-ohms",
 				     &ohms))
-		goto out;
+		return 0;
+
 	if (device_property_read_bool(ds1307->dev, "trickle-diode-disable"))
 		diode = false;
-	chip->trickle_charger_setup = chip->do_trickle_setup(ds1307,
-							     ohms, diode);
-out:
-	return;
+
+	return chip->do_trickle_setup(ds1307, ohms, diode);
 }
 
 /*----------------------------------------------------------------------*/
@@ -995,7 +1040,7 @@ static int ds3231_hwmon_read_temp(struct device *dev, s32 *mC)
 }
 
 static ssize_t ds3231_hwmon_show_temp(struct device *dev,
-				struct device_attribute *attr, char *buf)
+				      struct device_attribute *attr, char *buf)
 {
 	int ret;
 	s32 temp;
@@ -1006,8 +1051,8 @@ static ssize_t ds3231_hwmon_show_temp(struct device *dev,
 
 	return sprintf(buf, "%d\n", temp);
 }
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ds3231_hwmon_show_temp,
-			NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_input, 0444, ds3231_hwmon_show_temp,
+			  NULL, 0);
 
 static struct attribute *ds3231_hwmon_attrs[] = {
 	&sensor_dev_attr_temp1_input.dev_attr.attr,
@@ -1023,7 +1068,8 @@ static void ds1307_hwmon_register(struct ds1307 *ds1307)
 		return;
 
 	dev = devm_hwmon_device_register_with_groups(ds1307->dev, ds1307->name,
-						ds1307, ds3231_hwmon_groups);
+						     ds1307,
+						     ds3231_hwmon_groups);
 	if (IS_ERR(dev)) {
 		dev_warn(ds1307->dev, "unable to register hwmon device %ld\n",
 			 PTR_ERR(dev));
@@ -1095,7 +1141,7 @@ static unsigned long ds3231_clk_sqw_recalc_rate(struct clk_hw *hw,
 }
 
 static long ds3231_clk_sqw_round_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long *prate)
+				      unsigned long *prate)
 {
 	int i;
 
@@ -1108,7 +1154,7 @@ static long ds3231_clk_sqw_round_rate(struct clk_hw *hw, unsigned long rate,
 }
 
 static int ds3231_clk_sqw_set_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long parent_rate)
+				   unsigned long parent_rate)
 {
 	struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
 	int control = 0;
@@ -1168,7 +1214,7 @@ static const struct clk_ops ds3231_clk_sqw_ops = {
 };
 
 static unsigned long ds3231_clk_32khz_recalc_rate(struct clk_hw *hw,
-						unsigned long parent_rate)
+						  unsigned long parent_rate)
 {
 	return 32768;
 }
@@ -1259,7 +1305,7 @@ static int ds3231_clks_register(struct ds1307 *ds1307)
 
 		/* optional override of the clockname */
 		of_property_read_string_index(node, "clock-output-names", i,
-						&init.name);
+					      &init.name);
 		ds1307->clks[i].init = &init;
 
 		onecell->clks[i] = devm_clk_register(ds1307->dev,
@@ -1309,22 +1355,14 @@ static int ds1307_probe(struct i2c_client *client,
 	struct ds1307		*ds1307;
 	int			err = -ENODEV;
 	int			tmp, wday;
-	struct chip_desc	*chip;
-	bool			want_irq = false;
+	const struct chip_desc	*chip;
+	bool			want_irq;
 	bool			ds1307_can_wakeup_device = false;
-	unsigned char		*buf;
+	unsigned char		regs[8];
 	struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct rtc_time		tm;
 	unsigned long		timestamp;
-
-	irq_handler_t	irq_handler = ds1307_irq;
-
-	static const int	bbsqi_bitpos[] = {
-		[ds_1337] = 0,
-		[ds_1339] = DS1339_BIT_BBSQI,
-		[ds_3231] = DS3231_BIT_BBSQW,
-	};
-	const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops;
+	u8			trickle_charger_setup = 0;
 
 	ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL);
 	if (!ds1307)
@@ -1333,7 +1371,6 @@ static int ds1307_probe(struct i2c_client *client,
 	dev_set_drvdata(&client->dev, ds1307);
 	ds1307->dev = &client->dev;
 	ds1307->name = client->name;
-	ds1307->irq = client->irq;
 
 	ds1307->regmap = devm_regmap_init_i2c(client, &regmap_config);
 	if (IS_ERR(ds1307->regmap)) {
@@ -1361,23 +1398,22 @@ static int ds1307_probe(struct i2c_client *client,
 		ds1307->type = acpi_id->driver_data;
 	}
 
+	want_irq = client->irq > 0 && chip->alarm;
+
 	if (!pdata)
-		ds1307_trickle_init(ds1307, chip);
+		trickle_charger_setup = ds1307_trickle_init(ds1307, chip);
 	else if (pdata->trickle_charger_setup)
-		chip->trickle_charger_setup = pdata->trickle_charger_setup;
+		trickle_charger_setup = pdata->trickle_charger_setup;
 
-	if (chip->trickle_charger_setup && chip->trickle_charger_reg) {
+	if (trickle_charger_setup && chip->trickle_charger_reg) {
+		trickle_charger_setup |= DS13XX_TRICKLE_CHARGER_MAGIC;
 		dev_dbg(ds1307->dev,
 			"writing trickle charger info 0x%x to 0x%x\n",
-		    DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup,
-		    chip->trickle_charger_reg);
+			trickle_charger_setup, chip->trickle_charger_reg);
 		regmap_write(ds1307->regmap, chip->trickle_charger_reg,
-		    DS13XX_TRICKLE_CHARGER_MAGIC |
-		    chip->trickle_charger_setup);
+			     trickle_charger_setup);
 	}
 
-	buf = ds1307->regs;
-
 #ifdef CONFIG_OF
 /*
  * For devices with no IRQ directly connected to the SoC, the RTC chip
@@ -1387,31 +1423,27 @@ static int ds1307_probe(struct i2c_client *client,
  * This will guarantee the 'wakealarm' sysfs entry is available on the device,
  * if supported by the RTC.
  */
-	if (of_property_read_bool(client->dev.of_node, "wakeup-source")) {
-		ds1307_can_wakeup_device = true;
-	}
-	/* Intersil ISL12057 DT backward compatibility */
-	if (of_property_read_bool(client->dev.of_node,
-				  "isil,irq2-can-wakeup-machine")) {
+	if (chip->alarm && of_property_read_bool(client->dev.of_node,
+						 "wakeup-source"))
 		ds1307_can_wakeup_device = true;
-	}
 #endif
 
 	switch (ds1307->type) {
 	case ds_1337:
 	case ds_1339:
+	case ds_1341:
 	case ds_3231:
 		/* get registers that the "rtc" read below won't read... */
 		err = regmap_bulk_read(ds1307->regmap, DS1337_REG_CONTROL,
-				       buf, 2);
+				       regs, 2);
 		if (err) {
 			dev_dbg(ds1307->dev, "read error %d\n", err);
 			goto exit;
 		}
 
 		/* oscillator off?  turn it on, so clock can tick. */
-		if (ds1307->regs[0] & DS1337_BIT_nEOSC)
-			ds1307->regs[0] &= ~DS1337_BIT_nEOSC;
+		if (regs[0] & DS1337_BIT_nEOSC)
+			regs[0] &= ~DS1337_BIT_nEOSC;
 
 		/*
 		 * Using IRQ or defined as wakeup-source?
@@ -1419,114 +1451,92 @@ static int ds1307_probe(struct i2c_client *client,
 		 * For some variants, be sure alarms can trigger when we're
 		 * running on Vbackup (BBSQI/BBSQW)
 		 */
-		if (chip->alarm && (ds1307->irq > 0 ||
-				    ds1307_can_wakeup_device)) {
-			ds1307->regs[0] |= DS1337_BIT_INTCN
-					| bbsqi_bitpos[ds1307->type];
-			ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
-
-			want_irq = true;
+		if (want_irq || ds1307_can_wakeup_device) {
+			regs[0] |= DS1337_BIT_INTCN | chip->bbsqi_bit;
+			regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
 		}
 
 		regmap_write(ds1307->regmap, DS1337_REG_CONTROL,
-			     ds1307->regs[0]);
+			     regs[0]);
 
 		/* oscillator fault?  clear flag, and warn */
-		if (ds1307->regs[1] & DS1337_BIT_OSF) {
+		if (regs[1] & DS1337_BIT_OSF) {
 			regmap_write(ds1307->regmap, DS1337_REG_STATUS,
-				     ds1307->regs[1] & ~DS1337_BIT_OSF);
+				     regs[1] & ~DS1337_BIT_OSF);
 			dev_warn(ds1307->dev, "SET TIME!\n");
 		}
 		break;
 
 	case rx_8025:
 		err = regmap_bulk_read(ds1307->regmap,
-				       RX8025_REG_CTRL1 << 4 | 0x08, buf, 2);
+				       RX8025_REG_CTRL1 << 4 | 0x08, regs, 2);
 		if (err) {
 			dev_dbg(ds1307->dev, "read error %d\n", err);
 			goto exit;
 		}
 
 		/* oscillator off?  turn it on, so clock can tick. */
-		if (!(ds1307->regs[1] & RX8025_BIT_XST)) {
-			ds1307->regs[1] |= RX8025_BIT_XST;
+		if (!(regs[1] & RX8025_BIT_XST)) {
+			regs[1] |= RX8025_BIT_XST;
 			regmap_write(ds1307->regmap,
 				     RX8025_REG_CTRL2 << 4 | 0x08,
-				     ds1307->regs[1]);
+				     regs[1]);
 			dev_warn(ds1307->dev,
 				 "oscillator stop detected - SET TIME!\n");
 		}
 
-		if (ds1307->regs[1] & RX8025_BIT_PON) {
-			ds1307->regs[1] &= ~RX8025_BIT_PON;
+		if (regs[1] & RX8025_BIT_PON) {
+			regs[1] &= ~RX8025_BIT_PON;
 			regmap_write(ds1307->regmap,
 				     RX8025_REG_CTRL2 << 4 | 0x08,
-				     ds1307->regs[1]);
+				     regs[1]);
 			dev_warn(ds1307->dev, "power-on detected\n");
 		}
 
-		if (ds1307->regs[1] & RX8025_BIT_VDET) {
-			ds1307->regs[1] &= ~RX8025_BIT_VDET;
+		if (regs[1] & RX8025_BIT_VDET) {
+			regs[1] &= ~RX8025_BIT_VDET;
 			regmap_write(ds1307->regmap,
 				     RX8025_REG_CTRL2 << 4 | 0x08,
-				     ds1307->regs[1]);
+				     regs[1]);
 			dev_warn(ds1307->dev, "voltage drop detected\n");
 		}
 
 		/* make sure we are running in 24hour mode */
-		if (!(ds1307->regs[0] & RX8025_BIT_2412)) {
+		if (!(regs[0] & RX8025_BIT_2412)) {
 			u8 hour;
 
 			/* switch to 24 hour mode */
 			regmap_write(ds1307->regmap,
 				     RX8025_REG_CTRL1 << 4 | 0x08,
-				     ds1307->regs[0] | RX8025_BIT_2412);
+				     regs[0] | RX8025_BIT_2412);
 
 			err = regmap_bulk_read(ds1307->regmap,
 					       RX8025_REG_CTRL1 << 4 | 0x08,
-					       buf, 2);
+					       regs, 2);
 			if (err) {
 				dev_dbg(ds1307->dev, "read error %d\n", err);
 				goto exit;
 			}
 
 			/* correct hour */
-			hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]);
+			hour = bcd2bin(regs[DS1307_REG_HOUR]);
 			if (hour == 12)
 				hour = 0;
-			if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
+			if (regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
 				hour += 12;
 
 			regmap_write(ds1307->regmap,
 				     DS1307_REG_HOUR << 4 | 0x08, hour);
 		}
 		break;
-	case rx_8130:
-		ds1307->offset = 0x10; /* Seconds starts at 0x10 */
-		rtc_ops = &rx8130_rtc_ops;
-		if (chip->alarm && ds1307->irq > 0) {
-			irq_handler = rx8130_irq;
-			want_irq = true;
-		}
-		break;
-	case ds_1388:
-		ds1307->offset = 1; /* Seconds starts at 1 */
-		break;
-	case mcp794xx:
-		rtc_ops = &mcp794xx_rtc_ops;
-		if (chip->alarm && (ds1307->irq > 0 ||
-				    ds1307_can_wakeup_device)) {
-			irq_handler = mcp794xx_irq;
-			want_irq = true;
-		}
-		break;
 	default:
 		break;
 	}
 
 read_rtc:
 	/* read RTC registers */
-	err = regmap_bulk_read(ds1307->regmap, ds1307->offset, buf, 8);
+	err = regmap_bulk_read(ds1307->regmap, chip->offset, regs,
+			       sizeof(regs));
 	if (err) {
 		dev_dbg(ds1307->dev, "read error %d\n", err);
 		goto exit;
@@ -1537,7 +1547,7 @@ read_rtc:
 	 * specify the extra bits as must-be-zero, but there are
 	 * still a few values that are clearly out-of-range.
 	 */
-	tmp = ds1307->regs[DS1307_REG_SECS];
+	tmp = regs[DS1307_REG_SECS];
 	switch (ds1307->type) {
 	case ds_1307:
 	case m41t0:
@@ -1556,10 +1566,10 @@ read_rtc:
 			regmap_write(ds1307->regmap, DS1307_REG_SECS, 0);
 
 		/* oscillator fault?  clear flag, and warn */
-		if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
+		if (regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
 			regmap_write(ds1307->regmap, DS1307_REG_CONTROL,
-					ds1307->regs[DS1307_REG_CONTROL] &
-					~DS1338_BIT_OSF);
+				     regs[DS1307_REG_CONTROL] &
+				     ~DS1338_BIT_OSF);
 			dev_warn(ds1307->dev, "SET TIME!\n");
 			goto read_rtc;
 		}
@@ -1583,9 +1593,9 @@ read_rtc:
 		break;
 	case mcp794xx:
 		/* make sure that the backup battery is enabled */
-		if (!(ds1307->regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) {
+		if (!(regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) {
 			regmap_write(ds1307->regmap, DS1307_REG_WDAY,
-				     ds1307->regs[DS1307_REG_WDAY] |
+				     regs[DS1307_REG_WDAY] |
 				     MCP794XX_BIT_VBATEN);
 		}
 
@@ -1602,7 +1612,7 @@ read_rtc:
 		break;
 	}
 
-	tmp = ds1307->regs[DS1307_REG_HOUR];
+	tmp = regs[DS1307_REG_HOUR];
 	switch (ds1307->type) {
 	case ds_1340:
 	case m41t0:
@@ -1625,9 +1635,9 @@ read_rtc:
 		tmp = bcd2bin(tmp & 0x1f);
 		if (tmp == 12)
 			tmp = 0;
-		if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
+		if (regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
 			tmp += 12;
-		regmap_write(ds1307->regmap, ds1307->offset + DS1307_REG_HOUR,
+		regmap_write(ds1307->regmap, chip->offset + DS1307_REG_HOUR,
 			     bin2bcd(tmp));
 	}
 
@@ -1650,19 +1660,16 @@ read_rtc:
 				   MCP794XX_REG_WEEKDAY_WDAY_MASK,
 				   tm.tm_wday + 1);
 
-	if (want_irq) {
+	if (want_irq || ds1307_can_wakeup_device) {
 		device_set_wakeup_capable(ds1307->dev, true);
 		set_bit(HAS_ALARM, &ds1307->flags);
 	}
 
 	ds1307->rtc = devm_rtc_allocate_device(ds1307->dev);
-	if (IS_ERR(ds1307->rtc)) {
+	if (IS_ERR(ds1307->rtc))
 		return PTR_ERR(ds1307->rtc);
-	}
 
-	if (ds1307_can_wakeup_device && ds1307->irq <= 0) {
-		/* Disable request for an IRQ */
-		want_irq = false;
+	if (ds1307_can_wakeup_device && !want_irq) {
 		dev_info(ds1307->dev,
 			 "'wakeup-source' is set, request for an IRQ is disabled!\n");
 		/* We cannot support UIE mode if we do not have an IRQ line */
@@ -1670,8 +1677,8 @@ read_rtc:
 	}
 
 	if (want_irq) {
-		err = devm_request_threaded_irq(ds1307->dev,
-						ds1307->irq, NULL, irq_handler,
+		err = devm_request_threaded_irq(ds1307->dev, client->irq, NULL,
+						chip->irq_handler ?: ds1307_irq,
 						IRQF_SHARED | IRQF_ONESHOT,
 						ds1307->name, ds1307);
 		if (err) {
@@ -1679,8 +1686,9 @@ read_rtc:
 			device_set_wakeup_capable(ds1307->dev, false);
 			clear_bit(HAS_ALARM, &ds1307->flags);
 			dev_err(ds1307->dev, "unable to request IRQ!\n");
-		} else
+		} else {
 			dev_dbg(ds1307->dev, "got IRQ %d\n", client->irq);
+		}
 	}
 
 	if (chip->nvram_size) {
@@ -1691,13 +1699,12 @@ read_rtc:
 		ds1307->nvmem_cfg.reg_read = ds1307_nvram_read;
 		ds1307->nvmem_cfg.reg_write = ds1307_nvram_write;
 		ds1307->nvmem_cfg.priv = ds1307;
-		ds1307->nvram_offset = chip->nvram_offset;
 
 		ds1307->rtc->nvmem_config = &ds1307->nvmem_cfg;
 		ds1307->rtc->nvram_old_abi = true;
 	}
 
-	ds1307->rtc->ops = rtc_ops;
+	ds1307->rtc->ops = chip->rtc_ops ?: &ds13xx_rtc_ops;
 	err = rtc_register_device(ds1307->rtc);
 	if (err)
 		return err;

drivers/rtc/rtc-ds1672.c

@@ -190,7 +190,7 @@ static int ds1672_probe(struct i2c_client *client,
 	return 0;
 }
 
-static struct i2c_device_id ds1672_id[] = {
+static const struct i2c_device_id ds1672_id[] = {
 	{ "ds1672", 0 },
 	{ }
 };

drivers/rtc/rtc-em3027.c

@@ -132,7 +132,7 @@ static int em3027_probe(struct i2c_client *client,
 	return 0;
 }
 
-static struct i2c_device_id em3027_id[] = {
+static const struct i2c_device_id em3027_id[] = {
 	{ "em3027", 0 },
 	{ }
 };

drivers/rtc/rtc-goldfish.c

@@ -0,0 +1,237 @@
+/* drivers/rtc/rtc-goldfish.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (C) 2017 Imagination Technologies Ltd.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/io.h>
+
+#define TIMER_TIME_LOW		0x00	/* get low bits of current time  */
+					/*   and update TIMER_TIME_HIGH  */
+#define TIMER_TIME_HIGH	0x04	/* get high bits of time at last */
+					/*   TIMER_TIME_LOW read         */
+#define TIMER_ALARM_LOW	0x08	/* set low bits of alarm and     */
+					/*   activate it                 */
+#define TIMER_ALARM_HIGH	0x0c	/* set high bits of next alarm   */
+#define TIMER_IRQ_ENABLED	0x10
+#define TIMER_CLEAR_ALARM	0x14
+#define TIMER_ALARM_STATUS	0x18
+#define TIMER_CLEAR_INTERRUPT	0x1c
+
+struct goldfish_rtc {
+	void __iomem *base;
+	int irq;
+	struct rtc_device *rtc;
+};
+
+static int goldfish_rtc_read_alarm(struct device *dev,
+				   struct rtc_wkalrm *alrm)
+{
+	u64 rtc_alarm;
+	u64 rtc_alarm_low;
+	u64 rtc_alarm_high;
+	void __iomem *base;
+	struct goldfish_rtc *rtcdrv;
+
+	rtcdrv = dev_get_drvdata(dev);
+	base = rtcdrv->base;
+
+	rtc_alarm_low = readl(base + TIMER_ALARM_LOW);
+	rtc_alarm_high = readl(base + TIMER_ALARM_HIGH);
+	rtc_alarm = (rtc_alarm_high << 32) | rtc_alarm_low;
+
+	do_div(rtc_alarm, NSEC_PER_SEC);
+	memset(alrm, 0, sizeof(struct rtc_wkalrm));
+
+	rtc_time_to_tm(rtc_alarm, &alrm->time);
+
+	if (readl(base + TIMER_ALARM_STATUS))
+		alrm->enabled = 1;
+	else
+		alrm->enabled = 0;
+
+	return 0;
+}
+
+static int goldfish_rtc_set_alarm(struct device *dev,
+				  struct rtc_wkalrm *alrm)
+{
+	struct goldfish_rtc *rtcdrv;
+	unsigned long rtc_alarm;
+	u64 rtc_alarm64;
+	u64 rtc_status_reg;
+	void __iomem *base;
+	int ret = 0;
+
+	rtcdrv = dev_get_drvdata(dev);
+	base = rtcdrv->base;
+
+	if (alrm->enabled) {
+		ret = rtc_tm_to_time(&alrm->time, &rtc_alarm);
+		if (ret != 0)
+			return ret;
+
+		rtc_alarm64 = rtc_alarm * NSEC_PER_SEC;
+		writel((rtc_alarm64 >> 32), base + TIMER_ALARM_HIGH);
+		writel(rtc_alarm64, base + TIMER_ALARM_LOW);
+	} else {
+		/*
+		 * if this function was called with enabled=0
+		 * then it could mean that the application is
+		 * trying to cancel an ongoing alarm
+		 */
+		rtc_status_reg = readl(base + TIMER_ALARM_STATUS);
+		if (rtc_status_reg)
+			writel(1, base + TIMER_CLEAR_ALARM);
+	}
+
+	return ret;
+}
+
+static int goldfish_rtc_alarm_irq_enable(struct device *dev,
+					 unsigned int enabled)
+{
+	void __iomem *base;
+	struct goldfish_rtc *rtcdrv;
+
+	rtcdrv = dev_get_drvdata(dev);
+	base = rtcdrv->base;
+
+	if (enabled)
+		writel(1, base + TIMER_IRQ_ENABLED);
+	else
+		writel(0, base + TIMER_IRQ_ENABLED);
+
+	return 0;
+}
+
+static irqreturn_t goldfish_rtc_interrupt(int irq, void *dev_id)
+{
+	struct goldfish_rtc *rtcdrv = dev_id;
+	void __iomem *base = rtcdrv->base;
+
+	writel(1, base + TIMER_CLEAR_INTERRUPT);
+
+	rtc_update_irq(rtcdrv->rtc, 1, RTC_IRQF | RTC_AF);
+
+	return IRQ_HANDLED;
+}
+
+static int goldfish_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct goldfish_rtc *rtcdrv;
+	void __iomem *base;
+	u64 time_high;
+	u64 time_low;
+	u64 time;
+
+	rtcdrv = dev_get_drvdata(dev);
+	base = rtcdrv->base;
+
+	time_low = readl(base + TIMER_TIME_LOW);
+	time_high = readl(base + TIMER_TIME_HIGH);
+	time = (time_high << 32) | time_low;
+
+	do_div(time, NSEC_PER_SEC);
+
+	rtc_time_to_tm(time, tm);
+
+	return 0;
+}
+
+static int goldfish_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct goldfish_rtc *rtcdrv;
+	void __iomem *base;
+	unsigned long now;
+	u64 now64;
+	int ret;
+
+	rtcdrv = dev_get_drvdata(dev);
+	base = rtcdrv->base;
+
+	ret = rtc_tm_to_time(tm, &now);
+	if (ret == 0) {
+		now64 = now * NSEC_PER_SEC;
+		writel((now64 >> 32), base + TIMER_TIME_HIGH);
+		writel(now64, base + TIMER_TIME_LOW);
+	}
+
+	return ret;
+}
+
+static const struct rtc_class_ops goldfish_rtc_ops = {
+	.read_time	= goldfish_rtc_read_time,
+	.set_time	= goldfish_rtc_set_time,
+	.read_alarm	= goldfish_rtc_read_alarm,
+	.set_alarm	= goldfish_rtc_set_alarm,
+	.alarm_irq_enable = goldfish_rtc_alarm_irq_enable
+};
+
+static int goldfish_rtc_probe(struct platform_device *pdev)
+{
+	struct goldfish_rtc *rtcdrv;
+	struct resource *r;
+	int err;
+
+	rtcdrv = devm_kzalloc(&pdev->dev, sizeof(*rtcdrv), GFP_KERNEL);
+	if (!rtcdrv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, rtcdrv);
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r)
+		return -ENODEV;
+
+	rtcdrv->base = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(rtcdrv->base))
+		return -ENODEV;
+
+	rtcdrv->irq = platform_get_irq(pdev, 0);
+	if (rtcdrv->irq < 0)
+		return -ENODEV;
+
+	rtcdrv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+					       &goldfish_rtc_ops,
+					       THIS_MODULE);
+	if (IS_ERR(rtcdrv->rtc))
+		return PTR_ERR(rtcdrv->rtc);
+
+	err = devm_request_irq(&pdev->dev, rtcdrv->irq,
+			       goldfish_rtc_interrupt,
+			       0, pdev->name, rtcdrv);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static const struct of_device_id goldfish_rtc_of_match[] = {
+	{ .compatible = "google,goldfish-rtc", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, goldfish_rtc_of_match);
+
+static struct platform_driver goldfish_rtc = {
+	.probe = goldfish_rtc_probe,
+	.driver = {
+		.name = "goldfish_rtc",
+		.of_match_table = goldfish_rtc_of_match,
+	}
+};
+
+module_platform_driver(goldfish_rtc);

drivers/rtc/rtc-m41t80.c

@@ -440,28 +440,6 @@ static int m41t80_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(m41t80_pm, m41t80_suspend, m41t80_resume);
 
-static ssize_t flags_show(struct device *dev,
-			  struct device_attribute *attr, char *buf)
-{
-	struct i2c_client *client = to_i2c_client(dev);
-	int val;
-
-	val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
-	if (val < 0)
-		return val;
-	return sprintf(buf, "%#x\n", val);
-}
-static DEVICE_ATTR_RO(flags);
-
-static struct attribute *attrs[] = {
-	&dev_attr_flags.attr,
-	NULL,
-};
-
-static struct attribute_group attr_group = {
-	.attrs = attrs,
-};
-
 #ifdef CONFIG_COMMON_CLK
 #define sqw_to_m41t80_data(_hw) container_of(_hw, struct m41t80_data, sqw)
 
@@ -912,13 +890,6 @@ static struct notifier_block wdt_notifier = {
  *****************************************************************************
  */
 
-static void m41t80_remove_sysfs_group(void *_dev)
-{
-	struct device *dev = _dev;
-
-	sysfs_remove_group(&dev->kobj, &attr_group);
-}
-
 static int m41t80_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
@@ -927,6 +898,7 @@ static int m41t80_probe(struct i2c_client *client,
 	struct rtc_device *rtc = NULL;
 	struct rtc_time tm;
 	struct m41t80_data *m41t80_data = NULL;
+	bool wakeup_source = false;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
 				     I2C_FUNC_SMBUS_BYTE_DATA)) {
@@ -947,6 +919,10 @@ static int m41t80_probe(struct i2c_client *client,
 		m41t80_data->features = id->driver_data;
 	i2c_set_clientdata(client, m41t80_data);
 
+#ifdef CONFIG_OF
+	wakeup_source = of_property_read_bool(client->dev.of_node,
+					      "wakeup-source");
+#endif
 	if (client->irq > 0) {
 		rc = devm_request_threaded_irq(&client->dev, client->irq,
 					       NULL, m41t80_handle_irq,
@@ -955,14 +931,16 @@ static int m41t80_probe(struct i2c_client *client,
 		if (rc) {
 			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 			client->irq = 0;
-		} else {
-			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 */
-			device_init_wakeup(&client->dev, true);
+			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 */
+		device_init_wakeup(&client->dev, true);
+	}
 
 	rtc = devm_rtc_device_register(&client->dev, client->name,
 				       &m41t80_rtc_ops, THIS_MODULE);
@@ -970,6 +948,10 @@ static int m41t80_probe(struct i2c_client *client,
 		return PTR_ERR(rtc);
 
 	m41t80_data->rtc = rtc;
+	if (client->irq <= 0) {
+		/* We cannot support UIE mode if we do not have an IRQ line */
+		rtc->uie_unsupported = 1;
+	}
 
 	/* Make sure HT (Halt Update) bit is cleared */
 	rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR);
@@ -1004,21 +986,6 @@ static int m41t80_probe(struct i2c_client *client,
 		return rc;
 	}
 
-	/* Export sysfs entries */
-	rc = sysfs_create_group(&(&client->dev)->kobj, &attr_group);
-	if (rc) {
-		dev_err(&client->dev, "Failed to create sysfs group: %d\n", rc);
-		return rc;
-	}
-
-	rc = devm_add_action_or_reset(&client->dev, m41t80_remove_sysfs_group,
-				      &client->dev);
-	if (rc) {
-		dev_err(&client->dev,
-			"Failed to add sysfs cleanup action: %d\n", rc);
-		return rc;
-	}
-
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
 	if (m41t80_data->features & M41T80_FEATURE_HT) {
 		save_client = client;

drivers/rtc/rtc-max6900.c

@@ -226,7 +226,7 @@ max6900_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	return 0;
 }
 
-static struct i2c_device_id max6900_id[] = {
+static const struct i2c_device_id max6900_id[] = {
 	{ "max6900", 0 },
 	{ }
 };

drivers/rtc/rtc-max8925.c

@@ -234,8 +234,6 @@ static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 		ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
 	else
 		ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x0);
-	if (ret < 0)
-		goto out;
 out:
 	return ret;
 }

drivers/rtc/rtc-mxc.c

@@ -238,26 +238,6 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-/*
- * Clear all interrupts and release the IRQ
- */
-static void mxc_rtc_release(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
-	void __iomem *ioaddr = pdata->ioaddr;
-
-	spin_lock_irq(&pdata->rtc->irq_lock);
-
-	/* Disable all rtc interrupts */
-	writew(0, ioaddr + RTC_RTCIENR);
-
-	/* Clear all interrupt status */
-	writew(0xffffffff, ioaddr + RTC_RTCISR);
-
-	spin_unlock_irq(&pdata->rtc->irq_lock);
-}
-
 static int mxc_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	mxc_rtc_irq_enable(dev, RTC_ALM_BIT, enabled);
@@ -343,7 +323,6 @@ static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 
 /* RTC layer */
 static const struct rtc_class_ops mxc_rtc_ops = {
-	.release		= mxc_rtc_release,
 	.read_time		= mxc_rtc_read_time,
 	.set_mmss64		= mxc_rtc_set_mmss,
 	.read_alarm		= mxc_rtc_read_alarm,

drivers/rtc/rtc-puv3.c

@@ -157,49 +157,7 @@ static int puv3_rtc_proc(struct device *dev, struct seq_file *seq)
 	return 0;
 }
 
-static int puv3_rtc_open(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
-	int ret;
-
-	ret = request_irq(puv3_rtc_alarmno, puv3_rtc_alarmirq,
-			0, "pkunity-rtc alarm", rtc_dev);
-
-	if (ret) {
-		dev_err(dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
-		return ret;
-	}
-
-	ret = request_irq(puv3_rtc_tickno, puv3_rtc_tickirq,
-			0, "pkunity-rtc tick", rtc_dev);
-
-	if (ret) {
-		dev_err(dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
-		goto tick_err;
-	}
-
-	return ret;
-
- tick_err:
-	free_irq(puv3_rtc_alarmno, rtc_dev);
-	return ret;
-}
-
-static void puv3_rtc_release(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
-
-	/* do not clear AIE here, it may be needed for wake */
-	puv3_rtc_setpie(dev, 0);
-	free_irq(puv3_rtc_alarmno, rtc_dev);
-	free_irq(puv3_rtc_tickno, rtc_dev);
-}
-
 static const struct rtc_class_ops puv3_rtcops = {
-	.open		= puv3_rtc_open,
-	.release	= puv3_rtc_release,
 	.read_time	= puv3_rtc_gettime,
 	.set_time	= puv3_rtc_settime,
 	.read_alarm	= puv3_rtc_getalarm,
@@ -222,10 +180,6 @@ static void puv3_rtc_enable(struct device *dev, int en)
 
 static int puv3_rtc_remove(struct platform_device *dev)
 {
-	struct rtc_device *rtc = platform_get_drvdata(dev);
-
-	rtc_device_unregister(rtc);
-
 	puv3_rtc_setpie(&dev->dev, 0);
 	puv3_rtc_setaie(&dev->dev, 0);
 
@@ -259,6 +213,24 @@ static int puv3_rtc_probe(struct platform_device *pdev)
 	dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n",
 		 puv3_rtc_tickno, puv3_rtc_alarmno);
 
+	rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+
+	ret = devm_request_irq(&pdev->dev, puv3_rtc_alarmno, puv3_rtc_alarmirq,
+			       0, "pkunity-rtc alarm", rtc);
+	if (ret) {
+		dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
+		return ret;
+	}
+
+	ret = devm_request_irq(&pdev->dev, puv3_rtc_tickno, puv3_rtc_tickirq,
+			       0, "pkunity-rtc tick", rtc);
+	if (ret) {
+		dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
+		return ret;
+	}
+
 	/* get the memory region */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {
@@ -278,12 +250,10 @@ static int puv3_rtc_probe(struct platform_device *pdev)
 	puv3_rtc_enable(&pdev->dev, 1);
 
 	/* register RTC and exit */
-	rtc = rtc_device_register("pkunity", &pdev->dev, &puv3_rtcops,
-				  THIS_MODULE);
-
-	if (IS_ERR(rtc)) {
+	rtc->ops = &puv3_rtcops;
+	ret = rtc_register_device(rtc);
+	if (ret) {
 		dev_err(&pdev->dev, "cannot attach rtc\n");
-		ret = PTR_ERR(rtc);
 		goto err_nortc;
 	}
 

drivers/rtc/rtc-pxa.c

@@ -348,7 +348,7 @@ static int __init pxa_rtc_probe(struct platform_device *pdev)
 		dev_err(dev, "No alarm IRQ resource defined\n");
 		return -ENXIO;
 	}
-	pxa_rtc_open(dev);
+
 	pxa_rtc->base = devm_ioremap(dev, pxa_rtc->ress->start,
 				resource_size(pxa_rtc->ress));
 	if (!pxa_rtc->base) {
@@ -356,6 +356,8 @@ static int __init pxa_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	pxa_rtc_open(dev);
+
 	sa1100_rtc->rcnr = pxa_rtc->base + 0x0;
 	sa1100_rtc->rtsr = pxa_rtc->base + 0x8;
 	sa1100_rtc->rtar = pxa_rtc->base + 0x4;

drivers/rtc/rtc-rtd119x.c

@@ -0,0 +1,242 @@
+/*
+ * Realtek RTD129x RTC
+ *
+ * Copyright (c) 2017 Andreas Färber
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/spinlock.h>
+
+#define RTD_RTCSEC		0x00
+#define RTD_RTCMIN		0x04
+#define RTD_RTCHR		0x08
+#define RTD_RTCDATE1		0x0c
+#define RTD_RTCDATE2		0x10
+#define RTD_RTCACR		0x28
+#define RTD_RTCEN		0x2c
+#define RTD_RTCCR		0x30
+
+#define RTD_RTCSEC_RTCSEC_MASK		0x7f
+
+#define RTD_RTCMIN_RTCMIN_MASK		0x3f
+
+#define RTD_RTCHR_RTCHR_MASK		0x1f
+
+#define RTD_RTCDATE1_RTCDATE1_MASK	0xff
+
+#define RTD_RTCDATE2_RTCDATE2_MASK	0x7f
+
+#define RTD_RTCACR_RTCPWR		BIT(7)
+
+#define RTD_RTCEN_RTCEN_MASK		0xff
+
+#define RTD_RTCCR_RTCRST		BIT(6)
+
+struct rtd119x_rtc {
+	void __iomem *base;
+	struct clk *clk;
+	struct rtc_device *rtcdev;
+	unsigned int base_year;
+};
+
+static inline int rtd119x_rtc_days_in_year(int year)
+{
+	return 365 + (is_leap_year(year) ? 1 : 0);
+}
+
+static void rtd119x_rtc_reset(struct device *dev)
+{
+	struct rtd119x_rtc *data = dev_get_drvdata(dev);
+	u32 val;
+
+	val = readl_relaxed(data->base + RTD_RTCCR);
+	val |= RTD_RTCCR_RTCRST;
+	writel_relaxed(val, data->base + RTD_RTCCR);
+
+	val &= ~RTD_RTCCR_RTCRST;
+	writel(val, data->base + RTD_RTCCR);
+}
+
+static void rtd119x_rtc_set_enabled(struct device *dev, bool enable)
+{
+	struct rtd119x_rtc *data = dev_get_drvdata(dev);
+	u32 val;
+
+	val = readl_relaxed(data->base + RTD_RTCEN);
+	if (enable) {
+		if ((val & RTD_RTCEN_RTCEN_MASK) == 0x5a)
+			return;
+		writel_relaxed(0x5a, data->base + RTD_RTCEN);
+	} else {
+		writel_relaxed(0, data->base + RTD_RTCEN);
+	}
+}
+
+static int rtd119x_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct rtd119x_rtc *data = dev_get_drvdata(dev);
+	s32 day;
+	u32 sec;
+	unsigned int year;
+	int tries = 0;
+
+	while (true) {
+		tm->tm_sec = (readl_relaxed(data->base + RTD_RTCSEC) & RTD_RTCSEC_RTCSEC_MASK) >> 1;
+		tm->tm_min  = readl_relaxed(data->base + RTD_RTCMIN) & RTD_RTCMIN_RTCMIN_MASK;
+		tm->tm_hour = readl_relaxed(data->base + RTD_RTCHR) & RTD_RTCHR_RTCHR_MASK;
+		day  =  readl_relaxed(data->base + RTD_RTCDATE1) & RTD_RTCDATE1_RTCDATE1_MASK;
+		day |= (readl_relaxed(data->base + RTD_RTCDATE2) & RTD_RTCDATE2_RTCDATE2_MASK) << 8;
+		sec  = (readl_relaxed(data->base + RTD_RTCSEC) & RTD_RTCSEC_RTCSEC_MASK) >> 1;
+		tries++;
+
+		if (sec == tm->tm_sec)
+			break;
+
+		if (tries >= 3)
+			return -EINVAL;
+	}
+	if (tries > 1)
+		dev_dbg(dev, "%s: needed %i tries\n", __func__, tries);
+
+	year = data->base_year;
+	while (day >= rtd119x_rtc_days_in_year(year)) {
+		day -= rtd119x_rtc_days_in_year(year);
+		year++;
+	}
+	tm->tm_year = year - 1900;
+	tm->tm_yday = day;
+
+	tm->tm_mon = 0;
+	while (day >= rtc_month_days(tm->tm_mon, year)) {
+		day -= rtc_month_days(tm->tm_mon, year);
+		tm->tm_mon++;
+	}
+	tm->tm_mday = day + 1;
+
+	return 0;
+}
+
+static int rtd119x_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct rtd119x_rtc *data = dev_get_drvdata(dev);
+	unsigned int day;
+	int i;
+
+	if (1900 + tm->tm_year < data->base_year)
+		return -EINVAL;
+
+	day = 0;
+	for (i = data->base_year; i < 1900 + tm->tm_year; i++)
+		day += rtd119x_rtc_days_in_year(i);
+
+	day += tm->tm_yday;
+	if (day > 0x7fff)
+		return -EINVAL;
+
+	rtd119x_rtc_set_enabled(dev, false);
+
+	writel_relaxed((tm->tm_sec << 1) & RTD_RTCSEC_RTCSEC_MASK, data->base + RTD_RTCSEC);
+	writel_relaxed(tm->tm_min & RTD_RTCMIN_RTCMIN_MASK, data->base + RTD_RTCMIN);
+	writel_relaxed(tm->tm_hour & RTD_RTCHR_RTCHR_MASK, data->base + RTD_RTCHR);
+	writel_relaxed(day & RTD_RTCDATE1_RTCDATE1_MASK, data->base + RTD_RTCDATE1);
+	writel_relaxed((day >> 8) & RTD_RTCDATE2_RTCDATE2_MASK, data->base + RTD_RTCDATE2);
+
+	rtd119x_rtc_set_enabled(dev, true);
+
+	return 0;
+}
+
+static const struct rtc_class_ops rtd119x_rtc_ops = {
+	.read_time	= rtd119x_rtc_read_time,
+	.set_time	= rtd119x_rtc_set_time,
+};
+
+static const struct of_device_id rtd119x_rtc_dt_ids[] = {
+	 { .compatible = "realtek,rtd1295-rtc" },
+	 { }
+};
+
+static int rtd119x_rtc_probe(struct platform_device *pdev)
+{
+	struct rtd119x_rtc *data;
+	struct resource *res;
+	u32 val;
+	int ret;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, data);
+	data->base_year = 2014;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->base))
+		return PTR_ERR(data->base);
+
+	data->clk = of_clk_get(pdev->dev.of_node, 0);
+	if (IS_ERR(data->clk))
+		return PTR_ERR(data->clk);
+
+	ret = clk_prepare_enable(data->clk);
+	if (ret) {
+		clk_put(data->clk);
+		return ret;
+	}
+
+	val = readl_relaxed(data->base + RTD_RTCACR);
+	if (!(val & RTD_RTCACR_RTCPWR)) {
+		writel_relaxed(RTD_RTCACR_RTCPWR, data->base + RTD_RTCACR);
+
+		rtd119x_rtc_reset(&pdev->dev);
+
+		writel_relaxed(0, data->base + RTD_RTCMIN);
+		writel_relaxed(0, data->base + RTD_RTCHR);
+		writel_relaxed(0, data->base + RTD_RTCDATE1);
+		writel_relaxed(0, data->base + RTD_RTCDATE2);
+	}
+
+	rtd119x_rtc_set_enabled(&pdev->dev, true);
+
+	data->rtcdev = devm_rtc_device_register(&pdev->dev, "rtc",
+						&rtd119x_rtc_ops, THIS_MODULE);
+	if (IS_ERR(data->rtcdev)) {
+		dev_err(&pdev->dev, "failed to register rtc device");
+		clk_disable_unprepare(data->clk);
+		clk_put(data->clk);
+		return PTR_ERR(data->rtcdev);
+	}
+
+	return 0;
+}
+
+static int rtd119x_rtc_remove(struct platform_device *pdev)
+{
+	struct rtd119x_rtc *data = platform_get_drvdata(pdev);
+
+	rtd119x_rtc_set_enabled(&pdev->dev, false);
+
+	clk_disable_unprepare(data->clk);
+	clk_put(data->clk);
+
+	return 0;
+}
+
+static struct platform_driver rtd119x_rtc_driver = {
+	.probe = rtd119x_rtc_probe,
+	.remove = rtd119x_rtc_remove,
+	.driver = {
+		.name = "rtd1295-rtc",
+		.of_match_table	= rtd119x_rtc_dt_ids,
+	},
+};
+builtin_platform_driver(rtd119x_rtc_driver);

drivers/rtc/rtc-rv3029c2.c

@@ -868,7 +868,7 @@ static int rv3029_i2c_probe(struct i2c_client *client,
 	return rv3029_probe(&client->dev, regmap, client->irq, client->name);
 }
 
-static struct i2c_device_id rv3029_id[] = {
+static const struct i2c_device_id rv3029_id[] = {
 	{ "rv3029", 0 },
 	{ "rv3029c2", 0 },
 	{ }

drivers/rtc/rtc-s35390a.c

@@ -106,33 +106,12 @@ static int s35390a_get_reg(struct s35390a *s35390a, int reg, char *buf, int len)
 	return 0;
 }
 
-/*
- * Returns <0 on error, 0 if rtc is setup fine and 1 if the chip was reset.
- * To keep the information if an irq is pending, pass the value read from
- * STATUS1 to the caller.
- */
-static int s35390a_reset(struct s35390a *s35390a, char *status1)
+static int s35390a_init(struct s35390a *s35390a)
 {
 	char buf;
 	int ret;
 	unsigned initcount = 0;
 
-	ret = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, status1, 1);
-	if (ret < 0)
-		return ret;
-
-	if (*status1 & S35390A_FLAG_POC)
-		/*
-		 * Do not communicate for 0.5 seconds since the power-on
-		 * detection circuit is in operation.
-		 */
-		msleep(500);
-	else if (!(*status1 & S35390A_FLAG_BLD))
-		/*
-		 * If both POC and BLD are unset everything is fine.
-		 */
-		return 0;
-
 	/*
 	 * At least one of POC and BLD are set, so reinitialise chip. Keeping
 	 * this information in the hardware to know later that the time isn't
@@ -142,7 +121,6 @@ static int s35390a_reset(struct s35390a *s35390a, char *status1)
 	 * The 24H bit is kept over reset, so set it already here.
 	 */
 initialize:
-	*status1 = S35390A_FLAG_24H;
 	buf = S35390A_FLAG_RESET | S35390A_FLAG_24H;
 	ret = s35390a_set_reg(s35390a, S35390A_CMD_STATUS1, &buf, 1);
 
@@ -165,6 +143,34 @@ initialize:
 	return 1;
 }
 
+/*
+ * Returns <0 on error, 0 if rtc is setup fine and 1 if the chip was reset.
+ * To keep the information if an irq is pending, pass the value read from
+ * STATUS1 to the caller.
+ */
+static int s35390a_read_status(struct s35390a *s35390a, char *status1)
+{
+	int ret;
+
+	ret = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, status1, 1);
+	if (ret < 0)
+		return ret;
+
+	if (*status1 & S35390A_FLAG_POC) {
+		/*
+		 * Do not communicate for 0.5 seconds since the power-on
+		 * detection circuit is in operation.
+		 */
+		msleep(500);
+		return 1;
+	} else if (*status1 & S35390A_FLAG_BLD)
+		return 1;
+	/*
+	 * If both POC and BLD are unset everything is fine.
+	 */
+	return 0;
+}
+
 static int s35390a_disable_test_mode(struct s35390a *s35390a)
 {
 	char buf[1];
@@ -208,13 +214,16 @@ static int s35390a_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 {
 	struct s35390a	*s35390a = i2c_get_clientdata(client);
 	int i, err;
-	char buf[7];
+	char buf[7], status;
 
 	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d mday=%d, "
 		"mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
 		tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
 		tm->tm_wday);
 
+	if (s35390a_read_status(s35390a, &status) == 1)
+		s35390a_init(s35390a);
+
 	buf[S35390A_BYTE_YEAR] = bin2bcd(tm->tm_year - 100);
 	buf[S35390A_BYTE_MONTH] = bin2bcd(tm->tm_mon + 1);
 	buf[S35390A_BYTE_DAY] = bin2bcd(tm->tm_mday);
@@ -235,9 +244,12 @@ static int s35390a_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 static int s35390a_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 {
 	struct s35390a *s35390a = i2c_get_clientdata(client);
-	char buf[7];
+	char buf[7], status;
 	int i, err;
 
+	if (s35390a_read_status(s35390a, &status) == 1)
+		return -EINVAL;
+
 	err = s35390a_get_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
 	if (err < 0)
 		return err;
@@ -392,12 +404,42 @@ static int s35390a_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	return s35390a_set_datetime(to_i2c_client(dev), tm);
 }
 
+static int s35390a_rtc_ioctl(struct device *dev, unsigned int cmd,
+			     unsigned long arg)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct s35390a *s35390a = i2c_get_clientdata(client);
+	char sts;
+	int err;
+
+	switch (cmd) {
+	case RTC_VL_READ:
+		/* s35390a_reset set lowvoltage flag and init RTC if needed */
+		err = s35390a_read_status(s35390a, &sts);
+		if (err < 0)
+			return err;
+		if (copy_to_user((void __user *)arg, &err, sizeof(int)))
+			return -EFAULT;
+		break;
+	case RTC_VL_CLR:
+		/* update flag and clear register */
+		err = s35390a_init(s35390a);
+		if (err < 0)
+			return err;
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return 0;
+}
+
 static const struct rtc_class_ops s35390a_rtc_ops = {
 	.read_time	= s35390a_rtc_read_time,
 	.set_time	= s35390a_rtc_set_time,
 	.set_alarm	= s35390a_rtc_set_alarm,
 	.read_alarm	= s35390a_rtc_read_alarm,
-
+	.ioctl          = s35390a_rtc_ioctl,
 };
 
 static struct i2c_driver s35390a_driver;
@@ -405,7 +447,7 @@ static struct i2c_driver s35390a_driver;
 static int s35390a_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
-	int err, err_reset;
+	int err, err_read;
 	unsigned int i;
 	struct s35390a *s35390a;
 	struct rtc_time tm;
@@ -438,9 +480,9 @@ static int s35390a_probe(struct i2c_client *client,
 		}
 	}
 
-	err_reset = s35390a_reset(s35390a, &status1);
-	if (err_reset < 0) {
-		err = err_reset;
+	err_read = s35390a_read_status(s35390a, &status1);
+	if (err_read < 0) {
+		err = err_read;
 		dev_err(&client->dev, "error resetting chip\n");
 		goto exit_dummy;
 	}
@@ -466,7 +508,7 @@ static int s35390a_probe(struct i2c_client *client,
 		}
 	}
 
-	if (err_reset > 0 || s35390a_get_datetime(client, &tm) < 0)
+	if (err_read > 0 || s35390a_get_datetime(client, &tm) < 0)
 		dev_warn(&client->dev, "clock needs to be set\n");
 
 	device_set_wakeup_capable(&client->dev, 1);

drivers/rtc/rtc-sa1100.c

@@ -95,46 +95,6 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int sa1100_rtc_open(struct device *dev)
-{
-	struct sa1100_rtc *info = dev_get_drvdata(dev);
-	struct rtc_device *rtc = info->rtc;
-	int ret;
-
-	ret = request_irq(info->irq_1hz, sa1100_rtc_interrupt, 0, "rtc 1Hz", dev);
-	if (ret) {
-		dev_err(dev, "IRQ %d already in use.\n", info->irq_1hz);
-		goto fail_ui;
-	}
-	ret = request_irq(info->irq_alarm, sa1100_rtc_interrupt, 0, "rtc Alrm", dev);
-	if (ret) {
-		dev_err(dev, "IRQ %d already in use.\n", info->irq_alarm);
-		goto fail_ai;
-	}
-	rtc->max_user_freq = RTC_FREQ;
-	rtc_irq_set_freq(rtc, NULL, RTC_FREQ);
-
-	return 0;
-
- fail_ai:
-	free_irq(info->irq_1hz, dev);
- fail_ui:
-	clk_disable_unprepare(info->clk);
-	return ret;
-}
-
-static void sa1100_rtc_release(struct device *dev)
-{
-	struct sa1100_rtc *info = dev_get_drvdata(dev);
-
-	spin_lock_irq(&info->lock);
-	writel_relaxed(0, info->rtsr);
-	spin_unlock_irq(&info->lock);
-
-	free_irq(info->irq_alarm, dev);
-	free_irq(info->irq_1hz, dev);
-}
-
 static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	u32 rtsr;
@@ -216,8 +176,6 @@ static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq)
 }
 
 static const struct rtc_class_ops sa1100_rtc_ops = {
-	.open = sa1100_rtc_open,
-	.release = sa1100_rtc_release,
 	.read_time = sa1100_rtc_read_time,
 	.set_time = sa1100_rtc_set_time,
 	.read_alarm = sa1100_rtc_read_alarm,
@@ -265,6 +223,9 @@ int sa1100_rtc_init(struct platform_device *pdev, struct sa1100_rtc *info)
 	}
 	info->rtc = rtc;
 
+	rtc->max_user_freq = RTC_FREQ;
+	rtc_irq_set_freq(rtc, NULL, RTC_FREQ);
+
 	/* Fix for a nasty initialization problem the in SA11xx RTSR register.
 	 * See also the comments in sa1100_rtc_interrupt().
 	 *
@@ -299,6 +260,7 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
 	struct resource *iores;
 	void __iomem *base;
 	int irq_1hz, irq_alarm;
+	int ret;
 
 	irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz");
 	irq_alarm = platform_get_irq_byname(pdev, "rtc alarm");
@@ -311,6 +273,19 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
 	info->irq_1hz = irq_1hz;
 	info->irq_alarm = irq_alarm;
 
+	ret = devm_request_irq(&pdev->dev, irq_1hz, sa1100_rtc_interrupt, 0,
+			       "rtc 1Hz", &pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq_1hz);
+		return ret;
+	}
+	ret = devm_request_irq(&pdev->dev, irq_alarm, sa1100_rtc_interrupt, 0,
+			       "rtc Alrm", &pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq_alarm);
+		return ret;
+	}
+
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(&pdev->dev, iores);
 	if (IS_ERR(base))
@@ -339,8 +314,12 @@ static int sa1100_rtc_remove(struct platform_device *pdev)
 {
 	struct sa1100_rtc *info = platform_get_drvdata(pdev);
 
-	if (info)
+	if (info) {
+		spin_lock_irq(&info->lock);
+		writel_relaxed(0, info->rtsr);
+		spin_unlock_irq(&info->lock);
 		clk_disable_unprepare(info->clk);
+	}
 
 	return 0;
 }

drivers/rtc/rtc-sun6i.c

@@ -73,6 +73,9 @@
 #define SUN6I_ALARM_CONFIG			0x0050
 #define SUN6I_ALARM_CONFIG_WAKEUP		BIT(0)
 
+#define SUN6I_LOSC_OUT_GATING			0x0060
+#define SUN6I_LOSC_OUT_GATING_EN		BIT(0)
+
 /*
  * Get date values
  */
@@ -125,6 +128,7 @@ struct sun6i_rtc_dev {
 	struct clk_hw hw;
 	struct clk_hw *int_osc;
 	struct clk *losc;
+	struct clk *ext_losc;
 
 	spinlock_t lock;
 };
@@ -188,23 +192,24 @@ static void __init sun6i_rtc_clk_init(struct device_node *node)
 	struct clk_init_data init = {
 		.ops		= &sun6i_rtc_osc_ops,
 	};
+	const char *clkout_name = "osc32k-out";
 	const char *parents[2];
 
 	rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
 	if (!rtc)
 		return;
-	spin_lock_init(&rtc->lock);
 
-	clk_data = kzalloc(sizeof(*clk_data) + sizeof(*clk_data->hws),
+	clk_data = kzalloc(sizeof(*clk_data) + (sizeof(*clk_data->hws) * 2),
 			   GFP_KERNEL);
 	if (!clk_data)
 		return;
+
 	spin_lock_init(&rtc->lock);
 
 	rtc->base = of_io_request_and_map(node, 0, of_node_full_name(node));
 	if (IS_ERR(rtc->base)) {
 		pr_crit("Can't map RTC registers");
-		return;
+		goto err;
 	}
 
 	/* Switch to the external, more precise, oscillator */
@@ -216,7 +221,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node)
 
 	/* Deal with old DTs */
 	if (!of_get_property(node, "clocks", NULL))
-		return;
+		goto err;
 
 	rtc->int_osc = clk_hw_register_fixed_rate_with_accuracy(NULL,
 								"rtc-int-osc",
@@ -235,7 +240,8 @@ static void __init sun6i_rtc_clk_init(struct device_node *node)
 
 	init.parent_names = parents;
 	init.num_parents = of_clk_get_parent_count(node) + 1;
-	of_property_read_string(node, "clock-output-names", &init.name);
+	of_property_read_string_index(node, "clock-output-names", 0,
+				      &init.name);
 
 	rtc->losc = clk_register(NULL, &rtc->hw);
 	if (IS_ERR(rtc->losc)) {
@@ -243,9 +249,25 @@ static void __init sun6i_rtc_clk_init(struct device_node *node)
 		return;
 	}
 
-	clk_data->num = 1;
+	of_property_read_string_index(node, "clock-output-names", 1,
+				      &clkout_name);
+	rtc->ext_losc = clk_register_gate(NULL, clkout_name, rtc->hw.init->name,
+					  0, rtc->base + SUN6I_LOSC_OUT_GATING,
+					  SUN6I_LOSC_OUT_GATING_EN, 0,
+					  &rtc->lock);
+	if (IS_ERR(rtc->ext_losc)) {
+		pr_crit("Couldn't register the LOSC external gate\n");
+		return;
+	}
+
+	clk_data->num = 2;
 	clk_data->hws[0] = &rtc->hw;
+	clk_data->hws[1] = __clk_get_hw(rtc->ext_losc);
 	of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
+	return;
+
+err:
+	kfree(clk_data);
 }
 CLK_OF_DECLARE_DRIVER(sun6i_rtc_clk, "allwinner,sun6i-a31-rtc",
 		      sun6i_rtc_clk_init);

drivers/rtc/rtc-vr41xx.c

@@ -119,23 +119,6 @@ static inline void write_elapsed_second(unsigned long sec)
 	spin_unlock_irq(&rtc_lock);
 }
 
-static void vr41xx_rtc_release(struct device *dev)
-{
-
-	spin_lock_irq(&rtc_lock);
-
-	rtc1_write(ECMPLREG, 0);
-	rtc1_write(ECMPMREG, 0);
-	rtc1_write(ECMPHREG, 0);
-	rtc1_write(RTCL1LREG, 0);
-	rtc1_write(RTCL1HREG, 0);
-
-	spin_unlock_irq(&rtc_lock);
-
-	disable_irq(aie_irq);
-	disable_irq(pie_irq);
-}
-
 static int vr41xx_rtc_read_time(struct device *dev, struct rtc_time *time)
 {
 	unsigned long epoch_sec, elapsed_sec;
@@ -272,7 +255,6 @@ static irqreturn_t rtclong1_interrupt(int irq, void *dev_id)
 }
 
 static const struct rtc_class_ops vr41xx_rtc_ops = {
-	.release		= vr41xx_rtc_release,
 	.ioctl			= vr41xx_rtc_ioctl,
 	.read_time		= vr41xx_rtc_read_time,
 	.set_time		= vr41xx_rtc_set_time,

include/linux/rtc.h

@@ -72,8 +72,6 @@ extern struct class *rtc_class;
  * issued through ioctl() ...
  */
 struct rtc_class_ops {
-	int (*open)(struct device *);
-	void (*release)(struct device *);
 	int (*ioctl)(struct device *, unsigned int, unsigned long);
 	int (*read_time)(struct device *, struct rtc_time *);
 	int (*set_time)(struct device *, struct rtc_time *);