Merge tag 'rtc-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "Two new drivers and the new pcf2127 feature make the bulk of the
  additions. The rest are the usual fixes and new features.

  Subsystem:
   - add debug message when registration fails

  New drivers:
   - Amlogic Virtual Wake
   - Freescale FlexTimer Module alarm

  Drivers:
   - remove superfluous error messages
   - convert to i2c_new_dummy_device and devm_i2c_new_dummy_device
   - Remove dev_err() usage after platform_get_irq()
   - Set RTC range for: pcf2123, pcf8563, snvs.
   - pcf2127: tamper detection and watchdog support
   - pcf85363: fix regmap issue
   - sun6i: H6 support
   - remove w90x900/nuc900 driver"

* tag 'rtc-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (51 commits)
  rtc: meson: mark PM functions as __maybe_unused
  rtc: sc27xx: Remove clearing SPRD_RTC_POWEROFF_ALM_FLAG flag
  dt-bindings: rtc: ds1307: add rx8130 compatible
  rtc: sun6i: Allow using as wakeup source from suspend
  rtc: pcf8563: let the core handle range offsetting
  rtc: pcf8563: remove useless indirection
  rtc: pcf8563: convert to devm_rtc_allocate_device
  rtc: pcf8563: add Microcrystal RV8564 compatible
  rtc: pcf8563: add Epson RTC8564 compatible
  rtc: s35390a: convert to devm_i2c_new_dummy_device()
  rtc: max77686: convert to devm_i2c_new_dummy_device()
  rtc: pcf85363/pcf85263: fix regmap error in set_time
  rtc: snvs: switch to rtc_time64_to_tm/rtc_tm_to_time64
  rtc: snvs: set range
  rtc: snvs: fix possible race condition
  rtc: pcf2127: bugfix: watchdog build dependency
  rtc: pcf2127: add tamper detection support
  rtc: pcf2127: add watchdog feature support
  rtc: pcf2127: bugfix: read rtc disables watchdog
  rtc: pcf2127: cleanup register and bit defines
  ...

Documentation/devicetree/bindings/rtc/allwinner,sun6i-a31-rtc.yaml

@@ -25,6 +25,7 @@ properties:
       - items:
           - const: allwinner,sun50i-a64-rtc
           - const: allwinner,sun8i-h3-rtc
+      - const: allwinner,sun50i-h6-rtc
 
   reg:
     maxItems: 1
@@ -92,6 +93,18 @@ allOf:
           minItems: 3
           maxItems: 3
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: allwinner,sun50i-h6-rtc
+
+    then:
+      properties:
+        clock-output-names:
+          minItems: 3
+          maxItems: 3
+
   - if:
       properties:
         compatible:

Documentation/devicetree/bindings/rtc/nxp,rtc-2123.txt

 NXP PCF2123 SPI Real Time Clock
 
 Required properties:
-- compatible: should be: "nxp,rtc-pcf2123"
+- compatible: should be: "nxp,pcf2123"
                       or "microcrystal,rv2123"
 - reg: should be the SPI slave chipselect address
 
@@ -11,7 +11,7 @@ Optional properties:
 Example:
 
 pcf2123: rtc@3 {
-	compatible = "nxp,rtc-pcf2123"
+	compatible = "nxp,pcf2123"
 	reg = <3>
 	spi-cs-high;
 };

Documentation/devicetree/bindings/rtc/pcf8563.txt

@@ -3,7 +3,9 @@
 Philips PCF8563/Epson RTC8564 Real Time Clock
 
 Required properties:
-- compatible: Should contain "nxp,pcf8563".
+- compatible: Should contain "nxp,pcf8563",
+	"epson,rtc8564" or
+	"microcrystal,rv8564"
 - reg: I2C address for chip.
 
 Optional property:

Documentation/devicetree/bindings/rtc/rtc-ds1307.txt

@@ -19,6 +19,7 @@ Required properties:
 	"pericom,pt7c4338",
 	"epson,rx8025",
 	"isil,isl12057"
+	"epson,rx8130"
 - reg: I2C bus address of the device
 
 Optional properties:

Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt

+Freescale FlexTimer Module (FTM) Alarm
+
+Required properties:
+- compatible : Should be "fsl,<chip>-ftm-alarm", the
+	       supported chips include
+	       "fsl,ls1012a-ftm-alarm"
+	       "fsl,ls1021a-ftm-alarm"
+	       "fsl,ls1028a-ftm-alarm"
+	       "fsl,ls1043a-ftm-alarm"
+	       "fsl,ls1046a-ftm-alarm"
+	       "fsl,ls1088a-ftm-alarm"
+	       "fsl,ls208xa-ftm-alarm"
+	       "fsl,lx2160a-ftm-alarm"
+- reg : Specifies base physical address and size of the register sets for the
+  FlexTimer Module.
+- interrupts : Should be the FlexTimer Module interrupt.
+- fsl,rcpm-wakeup property and rcpm node : Please refer
+	Documentation/devicetree/bindings/soc/fsl/rcpm.txt
+
+Optional properties:
+- big-endian: If the host controller is big-endian mode, specify this property.
+  The default endian mode is little-endian.
+
+Example:
+rcpm: rcpm@1e34040 {
+	compatible = "fsl,ls1088a-rcpm", "fsl,qoriq-rcpm-2.1+";
+	reg = <0x0 0x1e34040 0x0 0x18>;
+	#fsl,rcpm-wakeup-cells = <6>;
+};
+
+ftm_alarm0: timer@2800000 {
+	compatible = "fsl,ls1088a-ftm-alarm";
+	reg = <0x0 0x2800000 0x0 0x10000>;
+	fsl,rcpm-wakeup = <&rcpm 0x0 0x0 0x0 0x0 0x4000 0x0>;
+	interrupts = <0 44 4>;
+};

Documentation/devicetree/bindings/rtc/rtc-meson-vrtc.txt

+* Amlogic Virtual RTC (VRTC)
+
+This is a Linux interface to an RTC managed by firmware, hence it's
+virtual from a Linux perspective.  The interface is 1 register where
+an alarm time (in seconds) is to be written.
+
+Required properties:
+- compatible: should be "amlogic,meson-vrtc"
+- reg: physical address for the alarm register
+
+The alarm register is a simple scratch register shared between the
+application processors (AP) and the secure co-processor (SCP.)  When
+the AP suspends, the SCP will use the value of this register to
+program an always-on timer before going sleep. When the timer expires,
+the SCP will wake up and will then wake the AP.
+
+Example:
+
+	vrtc: rtc@0a8 {
+		compatible = "amlogic,meson-vrtc";
+		reg = <0x0 0x000a8 0x0 0x4>;
+	};

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

@@ -52,8 +52,6 @@ properties:
       - nxp,pcf2127
       # Real-time clock
       - nxp,pcf2129
-      # Real-time clock/calendar
-      - nxp,pcf8563
       # Real-time Clock Module
       - pericom,pt7c4338
       # I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC

MAINTAINERS

@@ -1466,6 +1466,7 @@ F:	arch/arm64/boot/dts/amlogic/
 F:	drivers/pinctrl/meson/
 F:	drivers/mmc/host/meson*
 F:	drivers/soc/amlogic/
+F:	drivers/rtc/rtc-meson*
 N:	meson
 
 ARM/Amlogic Meson SoC Sound Drivers

drivers/rtc/Kconfig

@@ -373,6 +373,17 @@ config RTC_DRV_MAX77686
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-max77686.
 
+config RTC_DRV_MESON_VRTC
+	tristate "Amlogic Meson Virtual RTC"
+	depends on ARCH_MESON || COMPILE_TEST
+	default m if ARCH_MESON
+	help
+	  If you say yes here you will get support for the
+	  Virtual RTC of Amlogic SoCs.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-meson-vrtc.
+
 config RTC_DRV_RK808
 	tristate "Rockchip RK805/RK808/RK809/RK817/RK818 RTC"
 	depends on MFD_RK808
@@ -500,6 +511,7 @@ config RTC_DRV_M41T80_WDT
 	  watchdog timer in the ST M41T60 and M41T80 RTC chips series.
 config RTC_DRV_BD70528
 	tristate "ROHM BD70528 PMIC RTC"
+	depends on MFD_ROHM_BD70528 && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
 	help
 	  If you say Y here you will get support for the RTC
 	  on ROHM BD70528 Power Management IC.
@@ -874,9 +886,15 @@ config RTC_DRV_DS3232_HWMON
 config RTC_DRV_PCF2127
 	tristate "NXP PCF2127"
 	depends on RTC_I2C_AND_SPI
+	select WATCHDOG_CORE if WATCHDOG
 	help
 	  If you say yes here you get support for the NXP PCF2127/29 RTC
-	  chips.
+	  chips with integrated quartz crystal for industrial applications.
+	  Both chips also have watchdog timer and tamper switch detection
+	  features.
+
+	  PCF2127 has an additional feature of 512 bytes battery backed
+	  memory that's accessible using nvmem interface.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-pcf2127.
@@ -1247,13 +1265,6 @@ config RTC_DRV_AB8500
 	  Select this to enable the ST-Ericsson AB8500 power management IC RTC
 	  support. This chip contains a battery- and capacitor-backed RTC.
 
-config RTC_DRV_NUC900
-	tristate "NUC910/NUC920 RTC driver"
-	depends on ARCH_W90X900 || COMPILE_TEST
-	help
-	  If you say yes here you get support for the RTC subsystem of the
-	  NUC910/NUC920 used in embedded systems.
-
 config RTC_DRV_OPAL
 	tristate "IBM OPAL RTC driver"
 	depends on PPC_POWERNV
@@ -1323,6 +1334,21 @@ config RTC_DRV_IMXDI
 	   This driver can also be built as a module, if so, the module
 	   will be called "rtc-imxdi".
 
+config RTC_DRV_FSL_FTM_ALARM
+	tristate "Freescale FlexTimer alarm timer"
+	depends on ARCH_LAYERSCAPE || SOC_LS1021A
+	select FSL_RCPM
+	default y
+	help
+	   For the FlexTimer in LS1012A, LS1021A, LS1028A, LS1043A, LS1046A,
+	   LS1088A, LS208xA, we can use FTM as the wakeup source.
+
+	   Say y here to enable FTM alarm support. The FTM alarm provides
+	   alarm functions for wakeup system from deep sleep.
+
+	   This driver can also be built as a module, if so, the module
+	   will be called "rtc-fsl-ftm-alarm".
+
 config RTC_DRV_MESON
 	tristate "Amlogic Meson RTC"
 	depends on (ARM && ARCH_MESON) || COMPILE_TEST

drivers/rtc/Makefile

@@ -73,6 +73,7 @@ obj-$(CONFIG_RTC_DRV_EFI)	+= rtc-efi.o
 obj-$(CONFIG_RTC_DRV_EM3027)	+= rtc-em3027.o
 obj-$(CONFIG_RTC_DRV_EP93XX)	+= rtc-ep93xx.o
 obj-$(CONFIG_RTC_DRV_FM3130)	+= rtc-fm3130.o
+obj-$(CONFIG_RTC_DRV_FSL_FTM_ALARM)	+= rtc-fsl-ftm-alarm.o
 obj-$(CONFIG_RTC_DRV_FTRTC010)	+= rtc-ftrtc010.o
 obj-$(CONFIG_RTC_DRV_GENERIC)	+= rtc-generic.o
 obj-$(CONFIG_RTC_DRV_GOLDFISH)	+= rtc-goldfish.o
@@ -102,6 +103,7 @@ obj-$(CONFIG_RTC_DRV_MAX8907)	+= rtc-max8907.o
 obj-$(CONFIG_RTC_DRV_MAX8925)	+= rtc-max8925.o
 obj-$(CONFIG_RTC_DRV_MAX8997)	+= rtc-max8997.o
 obj-$(CONFIG_RTC_DRV_MAX8998)	+= rtc-max8998.o
+obj-$(CONFIG_RTC_DRV_MESON_VRTC)+= rtc-meson-vrtc.o
 obj-$(CONFIG_RTC_DRV_MC13XXX)	+= rtc-mc13xxx.o
 obj-$(CONFIG_RTC_DRV_MCP795)	+= rtc-mcp795.o
 obj-$(CONFIG_RTC_DRV_MESON)	+= rtc-meson.o
@@ -113,7 +115,6 @@ 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-$(CONFIG_RTC_DRV_OPAL)	+= rtc-opal.o
 obj-$(CONFIG_RTC_DRV_PALMAS)	+= rtc-palmas.o

drivers/rtc/class.c

@@ -346,8 +346,10 @@ int __rtc_register_device(struct module *owner, struct rtc_device *rtc)
 	struct rtc_wkalrm alrm;
 	int err;
 
-	if (!rtc->ops)
+	if (!rtc->ops) {
+		dev_dbg(&rtc->dev, "no ops set\n");
 		return -EINVAL;
+	}
 
 	rtc->owner = owner;
 	rtc_device_get_offset(rtc);

drivers/rtc/rtc-88pm80x.c

@@ -264,7 +264,6 @@ static int pm80x_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	info->irq = platform_get_irq(pdev, 0);
 	if (info->irq < 0) {
-		dev_err(&pdev->dev, "No IRQ resource!\n");
 		ret = -EINVAL;
 		goto out;
 	}
@@ -296,10 +295,9 @@ static int pm80x_rtc_probe(struct platform_device *pdev)
 	info->rtc_dev->range_max = U32_MAX;
 
 	ret = rtc_register_device(info->rtc_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
+	if (ret)
 		goto out_rtc;
-	}
+
 	/*
 	 * enable internal XO instead of internal 3.25MHz clock since it can
 	 * free running in PMIC power-down state.

drivers/rtc/rtc-88pm860x.c

@@ -328,10 +328,8 @@ static int pm860x_rtc_probe(struct platform_device *pdev)
 	if (!info)
 		return -ENOMEM;
 	info->irq = platform_get_irq(pdev, 0);
-	if (info->irq < 0) {
-		dev_err(&pdev->dev, "No IRQ resource!\n");
+	if (info->irq < 0)
 		return info->irq;
-	}
 
 	info->chip = chip;
 	info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;

drivers/rtc/rtc-ab-eoz9.c

@@ -390,35 +390,31 @@ static int abeoz9_probe(struct i2c_client *client,
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
 				     I2C_FUNC_SMBUS_BYTE_DATA |
-				     I2C_FUNC_SMBUS_I2C_BLOCK)) {
-		ret = -ENODEV;
-		goto err;
-	}
+				     I2C_FUNC_SMBUS_I2C_BLOCK))
+		return -ENODEV;
 
 	regmap = devm_regmap_init_i2c(client, &abeoz9_rtc_regmap_config);
 	if (IS_ERR(regmap)) {
 		ret = PTR_ERR(regmap);
 		dev_err(dev, "regmap allocation failed: %d\n", ret);
-		goto err;
+		return ret;
 	}
 
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
-	if (!data) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!data)
+		return -ENOMEM;
 
 	data->regmap = regmap;
 	dev_set_drvdata(dev, data);
 
 	ret = abeoz9_rtc_setup(dev, client->dev.of_node);
 	if (ret)
-		goto err;
+		return ret;
 
 	data->rtc = devm_rtc_allocate_device(dev);
 	ret = PTR_ERR_OR_ZERO(data->rtc);
 	if (ret)
-		goto err;
+		return ret;
 
 	data->rtc->ops = &rtc_ops;
 	data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
@@ -426,14 +422,10 @@ static int abeoz9_probe(struct i2c_client *client,
 
 	ret = rtc_register_device(data->rtc);
 	if (ret)
-		goto err;
+		return ret;
 
 	abeoz9_hwmon_register(dev, data);
 	return 0;
-
-err:
-	dev_err(dev, "unable to register RTC device (%d)\n", ret);
-	return ret;
 }
 
 #ifdef CONFIG_OF

drivers/rtc/rtc-ac100.c

@@ -578,10 +578,8 @@ static int ac100_rtc_probe(struct platform_device *pdev)
 	chip->regmap = ac100->regmap;
 
 	chip->irq = platform_get_irq(pdev, 0);
-	if (chip->irq < 0) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
+	if (chip->irq < 0)
 		return chip->irq;
-	}
 
 	chip->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(chip->rtc))
@@ -612,15 +610,7 @@ static int ac100_rtc_probe(struct platform_device *pdev)
 	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;
+	return rtc_register_device(chip->rtc);
 }
 
 static int ac100_rtc_remove(struct platform_device *pdev)

drivers/rtc/rtc-armada38x.c

@@ -502,7 +502,6 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct armada38x_rtc *rtc;
 	const struct of_device_id *match;
-	int ret;
 
 	match = of_match_device(armada38x_rtc_of_match_table, &pdev->dev);
 	if (!match)
@@ -530,11 +529,8 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(rtc->regs_soc);
 
 	rtc->irq = platform_get_irq(pdev, 0);
-
-	if (rtc->irq < 0) {
-		dev_err(&pdev->dev, "no irq\n");
+	if (rtc->irq < 0)
 		return rtc->irq;
-	}
 
 	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(rtc->rtc_dev))
@@ -564,11 +560,7 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev)
 
 	rtc->rtc_dev->range_max = U32_MAX;
 
-	ret = rtc_register_device(rtc->rtc_dev);
-	if (ret)
-		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
-
-	return ret;
+	return rtc_register_device(rtc->rtc_dev);
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/rtc/rtc-asm9260.c

@@ -257,10 +257,8 @@ static int asm9260_rtc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, priv);
 
 	irq_alarm = platform_get_irq(pdev, 0);
-	if (irq_alarm < 0) {
-		dev_err(dev, "No alarm IRQ resource defined\n");
+	if (irq_alarm < 0)
 		return irq_alarm;
-	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	priv->iobase = devm_ioremap_resource(dev, res);

drivers/rtc/rtc-aspeed.c

@@ -86,7 +86,6 @@ static int aspeed_rtc_probe(struct platform_device *pdev)
 {
 	struct aspeed_rtc *rtc;
 	struct resource *res;
-	int ret;
 
 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
 	if (!rtc)
@@ -107,11 +106,7 @@ static int aspeed_rtc_probe(struct platform_device *pdev)
 	rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900;
 	rtc->rtc_dev->range_max = 38814989399LL; /* 3199-12-31 23:59:59 */
 
-	ret = rtc_register_device(rtc->rtc_dev);
-	if (ret)
-		return ret;
-
-	return 0;
+	return rtc_register_device(rtc->rtc_dev);
 }
 
 static const struct of_device_id aspeed_rtc_match[] = {

drivers/rtc/rtc-at91rm9200.c

@@ -378,10 +378,8 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "no irq resource defined\n");
+	if (irq < 0)
 		return -ENXIO;
-	}
 
 	at91_rtc_regs = devm_ioremap(&pdev->dev, regs->start,
 				     resource_size(regs));

drivers/rtc/rtc-at91sam9.c

@@ -342,10 +342,8 @@ static int at91_rtc_probe(struct platform_device *pdev)
 	struct of_phandle_args args;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "failed to get interrupt resource\n");
+	if (irq < 0)
 		return irq;
-	}
 
 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
 	if (!rtc)

drivers/rtc/rtc-bd70528.c

@@ -416,11 +416,8 @@ static int bd70528_probe(struct platform_device *pdev)
 	bd_rtc->dev = &pdev->dev;
 
 	irq = platform_get_irq_byname(pdev, "bd70528-rtc-alm");
-
-	if (irq < 0) {
-		dev_err(&pdev->dev, "Failed to get irq\n");
+	if (irq < 0)
 		return irq;
-	}
 
 	platform_set_drvdata(pdev, bd_rtc);
 
@@ -479,11 +476,7 @@ static int bd70528_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = rtc_register_device(rtc);
-	if (ret)
-		dev_err(&pdev->dev, "Registering RTC failed\n");
-
-	return ret;
+	return rtc_register_device(rtc);
 }
 
 static struct platform_driver bd70528_rtc = {

drivers/rtc/rtc-brcmstb-waketimer.c

@@ -255,10 +255,8 @@ static int brcmstb_waketmr_probe(struct platform_device *pdev)
 	timer->rtc->range_max = U32_MAX;
 
 	ret = rtc_register_device(timer->rtc);
-	if (ret) {
-		dev_err(dev, "unable to register device\n");
+	if (ret)
 		goto err_notifier;
-	}
 
 	dev_info(dev, "registered, with irq %d\n", timer->irq);
 

drivers/rtc/rtc-cadence.c

@@ -289,12 +289,8 @@ static int cdns_rtc_probe(struct platform_device *pdev)
 	}
 
 	crtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
-	if (IS_ERR(crtc->rtc_dev)) {
-		ret = PTR_ERR(crtc->rtc_dev);
-		dev_err(&pdev->dev,
-			"Failed to allocate the RTC device, %d\n", ret);
-		return ret;
-	}
+	if (IS_ERR(crtc->rtc_dev))
+		return PTR_ERR(crtc->rtc_dev);
 
 	platform_set_drvdata(pdev, crtc);
 
@@ -343,11 +339,8 @@ static int cdns_rtc_probe(struct platform_device *pdev)
 	writel(CDNS_RTC_KRTCR_KRTC, crtc->regs + CDNS_RTC_KRTCR);
 
 	ret = rtc_register_device(crtc->rtc_dev);
-	if (ret) {
-		dev_err(&pdev->dev,
-			"Failed to register the RTC device, %d\n", ret);
+	if (ret)
 		goto err_disable_wakeup;
-	}
 
 	return 0;
 

drivers/rtc/rtc-davinci.c

@@ -477,10 +477,8 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	davinci_rtc->irq = platform_get_irq(pdev, 0);
-	if (davinci_rtc->irq < 0) {
-		dev_err(dev, "no RTC irq\n");
+	if (davinci_rtc->irq < 0)
 		return davinci_rtc->irq;
-	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	davinci_rtc->base = devm_ioremap_resource(dev, res);

drivers/rtc/rtc-ds1305.c

@@ -690,19 +690,16 @@ static int ds1305_probe(struct spi_device *spi)
 
 	/* register RTC ... from here on, ds1305->ctrl needs locking */
 	ds1305->rtc = devm_rtc_allocate_device(&spi->dev);
-	if (IS_ERR(ds1305->rtc)) {
+	if (IS_ERR(ds1305->rtc))
 		return PTR_ERR(ds1305->rtc);
-	}
 
 	ds1305->rtc->ops = &ds1305_ops;
 
 	ds1305_nvmem_cfg.priv = ds1305;
 	ds1305->rtc->nvram_old_abi = true;
 	status = rtc_register_device(ds1305->rtc);
-	if (status) {
-		dev_dbg(&spi->dev, "register rtc --> %d\n", status);
+	if (status)
 		return status;
-	}
 
 	rtc_nvmem_register(ds1305->rtc, &ds1305_nvmem_cfg);
 

drivers/rtc/rtc-ds1672.c

@@ -128,9 +128,6 @@ static int ds1672_probe(struct i2c_client *client,
 	if (err)
 		return err;
 
-	if (IS_ERR(rtc))
-		return PTR_ERR(rtc);
-
 	i2c_set_clientdata(client, rtc);
 
 	return 0;

drivers/rtc/rtc-fsl-ftm-alarm.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Freescale FlexTimer Module (FTM) alarm device driver.
+ *
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ * Copyright 2019 NXP
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/module.h>
+#include <linux/fsl/ftm.h>
+#include <linux/rtc.h>
+#include <linux/time.h>
+
+#define FTM_SC_CLK(c)		((c) << FTM_SC_CLK_MASK_SHIFT)
+
+/*
+ * Select Fixed frequency clock (32KHz) as clock source
+ * of FlexTimer Module
+ */
+#define FTM_SC_CLKS_FIXED_FREQ	0x02
+#define FIXED_FREQ_CLK		32000
+
+/* Select 128 (2^7) as divider factor */
+#define MAX_FREQ_DIV		(1 << FTM_SC_PS_MASK)
+
+/* Maximum counter value in FlexTimer's CNT registers */
+#define MAX_COUNT_VAL		0xffff
+
+struct ftm_rtc {
+	struct rtc_device *rtc_dev;
+	void __iomem *base;
+	bool big_endian;
+	u32 alarm_freq;
+};
+
+static inline u32 rtc_readl(struct ftm_rtc *dev, u32 reg)
+{
+	if (dev->big_endian)
+		return ioread32be(dev->base + reg);
+	else
+		return ioread32(dev->base + reg);
+}
+
+static inline void rtc_writel(struct ftm_rtc *dev, u32 reg, u32 val)
+{
+	if (dev->big_endian)
+		iowrite32be(val, dev->base + reg);
+	else
+		iowrite32(val, dev->base + reg);
+}
+
+static inline void ftm_counter_enable(struct ftm_rtc *rtc)
+{
+	u32 val;
+
+	/* select and enable counter clock source */
+	val = rtc_readl(rtc, FTM_SC);
+	val &= ~(FTM_SC_PS_MASK | FTM_SC_CLK_MASK);
+	val |= (FTM_SC_PS_MASK | FTM_SC_CLK(FTM_SC_CLKS_FIXED_FREQ));
+	rtc_writel(rtc, FTM_SC, val);
+}
+
+static inline void ftm_counter_disable(struct ftm_rtc *rtc)
+{
+	u32 val;
+
+	/* disable counter clock source */
+	val = rtc_readl(rtc, FTM_SC);
+	val &= ~(FTM_SC_PS_MASK | FTM_SC_CLK_MASK);
+	rtc_writel(rtc, FTM_SC, val);
+}
+
+static inline void ftm_irq_acknowledge(struct ftm_rtc *rtc)
+{
+	unsigned int timeout = 100;
+
+	/*
+	 *Fix errata A-007728 for flextimer
+	 *	If the FTM counter reaches the FTM_MOD value between
+	 *	the reading of the TOF bit and the writing of 0 to
+	 *	the TOF bit, the process of clearing the TOF bit
+	 *	does not work as expected when FTMx_CONF[NUMTOF] != 0
+	 *	and the current TOF count is less than FTMx_CONF[NUMTOF].
+	 *	If the above condition is met, the TOF bit remains set.
+	 *	If the TOF interrupt is enabled (FTMx_SC[TOIE] = 1),the
+	 *	TOF interrupt also remains asserted.
+	 *
+	 *	Above is the errata discription
+	 *
+	 *	In one word: software clearing TOF bit not works when
+	 *	FTMx_CONF[NUMTOF] was seted as nonzero and FTM counter
+	 *	reaches the FTM_MOD value.
+	 *
+	 *	The workaround is clearing TOF bit until it works
+	 *	(FTM counter doesn't always reache the FTM_MOD anyway),
+	 *	which may cost some cycles.
+	 */
+	while ((FTM_SC_TOF & rtc_readl(rtc, FTM_SC)) && timeout--)
+		rtc_writel(rtc, FTM_SC, rtc_readl(rtc, FTM_SC) & (~FTM_SC_TOF));
+}
+
+static inline void ftm_irq_enable(struct ftm_rtc *rtc)
+{
+	u32 val;
+
+	val = rtc_readl(rtc, FTM_SC);
+	val |= FTM_SC_TOIE;
+	rtc_writel(rtc, FTM_SC, val);
+}
+
+static inline void ftm_irq_disable(struct ftm_rtc *rtc)
+{
+	u32 val;
+
+	val = rtc_readl(rtc, FTM_SC);
+	val &= ~FTM_SC_TOIE;
+	rtc_writel(rtc, FTM_SC, val);
+}
+
+static inline void ftm_reset_counter(struct ftm_rtc *rtc)
+{
+	/*
+	 * The CNT register contains the FTM counter value.
+	 * Reset clears the CNT register. Writing any value to COUNT
+	 * updates the counter with its initial value, CNTIN.
+	 */
+	rtc_writel(rtc, FTM_CNT, 0x00);
+}
+
+static void ftm_clean_alarm(struct ftm_rtc *rtc)
+{
+	ftm_counter_disable(rtc);
+
+	rtc_writel(rtc, FTM_CNTIN, 0x00);
+	rtc_writel(rtc, FTM_MOD, ~0U);
+
+	ftm_reset_counter(rtc);
+}
+
+static irqreturn_t ftm_rtc_alarm_interrupt(int irq, void *dev)
+{
+	struct ftm_rtc *rtc = dev;
+
+	ftm_irq_acknowledge(rtc);
+	ftm_irq_disable(rtc);
+	ftm_clean_alarm(rtc);
+
+	return IRQ_HANDLED;
+}
+
+static int ftm_rtc_alarm_irq_enable(struct device *dev,
+		unsigned int enabled)
+{
+	struct ftm_rtc *rtc = dev_get_drvdata(dev);
+
+	if (enabled)
+		ftm_irq_enable(rtc);
+	else
+		ftm_irq_disable(rtc);
+
+	return 0;
+}
+
+/*
+ * Note:
+ *	The function is not really getting time from the RTC
+ *	since FlexTimer is not a RTC device, but we need to
+ *	get time to setup alarm, so we are using system time
+ *	for now.
+ */
+static int ftm_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct timespec64 ts64;
+
+	ktime_get_real_ts64(&ts64);
+	rtc_time_to_tm(ts64.tv_sec, tm);
+
+	return 0;
+}
+
+static int ftm_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	return 0;
+}
+
+/*
+ * 1. Select fixed frequency clock (32KHz) as clock source;
+ * 2. Select 128 (2^7) as divider factor;
+ * So clock is 250 Hz (32KHz/128).
+ *
+ * 3. FlexTimer's CNT register is a 32bit register,
+ * but the register's 16 bit as counter value,it's other 16 bit
+ * is reserved.So minimum counter value is 0x0,maximum counter
+ * value is 0xffff.
+ * So max alarm value is 262 (65536 / 250) seconds
+ */
+static int ftm_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	struct rtc_time tm;
+	unsigned long now, alm_time, cycle;
+	struct ftm_rtc *rtc = dev_get_drvdata(dev);
+
+	ftm_rtc_read_time(dev, &tm);
+	rtc_tm_to_time(&tm, &now);
+	rtc_tm_to_time(&alm->time, &alm_time);
+
+	ftm_clean_alarm(rtc);
+	cycle = (alm_time - now) * rtc->alarm_freq;
+	if (cycle > MAX_COUNT_VAL) {
+		pr_err("Out of alarm range {0~262} seconds.\n");
+		return -ERANGE;
+	}
+
+	ftm_irq_disable(rtc);
+
+	/*
+	 * The counter increments until the value of MOD is reached,
+	 * at which point the counter is reloaded with the value of CNTIN.
+	 * The TOF (the overflow flag) bit is set when the FTM counter
+	 * changes from MOD to CNTIN. So we should using the cycle - 1.
+	 */
+	rtc_writel(rtc, FTM_MOD, cycle - 1);
+
+	ftm_counter_enable(rtc);
+	ftm_irq_enable(rtc);
+
+	return 0;
+
+}
+
+static const struct rtc_class_ops ftm_rtc_ops = {
+	.read_time		= ftm_rtc_read_time,
+	.read_alarm		= ftm_rtc_read_alarm,
+	.set_alarm		= ftm_rtc_set_alarm,
+	.alarm_irq_enable	= ftm_rtc_alarm_irq_enable,
+};
+
+static int ftm_rtc_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *r;
+	int irq;
+	int ret;
+	struct ftm_rtc *rtc;
+
+	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
+	if (unlikely(!rtc)) {
+		dev_err(&pdev->dev, "cannot alloc memory for rtc\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, rtc);
+
+	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc->rtc_dev))
+		return PTR_ERR(rtc->rtc_dev);
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		dev_err(&pdev->dev, "cannot get resource for rtc\n");
+		return -ENODEV;
+	}
+
+	rtc->base = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(rtc->base)) {
+		dev_err(&pdev->dev, "cannot ioremap resource for rtc\n");
+		return PTR_ERR(rtc->base);
+	}
+
+	irq = irq_of_parse_and_map(np, 0);
+	if (irq <= 0) {
+		dev_err(&pdev->dev, "unable to get IRQ from DT, %d\n", irq);
+		return -EINVAL;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, ftm_rtc_alarm_interrupt,
+			       IRQF_NO_SUSPEND, dev_name(&pdev->dev), rtc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to request irq\n");
+		return ret;
+	}
+
+	rtc->big_endian = of_property_read_bool(np, "big-endian");
+	rtc->alarm_freq = (u32)FIXED_FREQ_CLK / (u32)MAX_FREQ_DIV;
+	rtc->rtc_dev->ops = &ftm_rtc_ops;
+
+	device_init_wakeup(&pdev->dev, true);
+
+	ret = rtc_register_device(rtc->rtc_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "can't register rtc device\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id ftm_rtc_match[] = {
+	{ .compatible = "fsl,ls1012a-ftm-alarm", },
+	{ .compatible = "fsl,ls1021a-ftm-alarm", },
+	{ .compatible = "fsl,ls1028a-ftm-alarm", },
+	{ .compatible = "fsl,ls1043a-ftm-alarm", },
+	{ .compatible = "fsl,ls1046a-ftm-alarm", },
+	{ .compatible = "fsl,ls1088a-ftm-alarm", },
+	{ .compatible = "fsl,ls208xa-ftm-alarm", },
+	{ .compatible = "fsl,lx2160a-ftm-alarm", },
+	{ },
+};
+
+static struct platform_driver ftm_rtc_driver = {
+	.probe		= ftm_rtc_probe,
+	.driver		= {
+		.name	= "ftm-alarm",
+		.of_match_table = ftm_rtc_match,
+	},
+};
+
+static int __init ftm_alarm_init(void)
+{
+	return platform_driver_register(&ftm_rtc_driver);
+}
+
+device_initcall(ftm_alarm_init);
+
+MODULE_DESCRIPTION("NXP/Freescale FlexTimer alarm driver");
+MODULE_AUTHOR("Biwen Li <biwen.li@nxp.com>");
+MODULE_LICENSE("GPL");

drivers/rtc/rtc-imx-sc.c

@@ -167,10 +167,8 @@ static int imx_sc_rtc_probe(struct platform_device *pdev)
 	imx_sc_rtc->range_max = U32_MAX;
 
 	ret = rtc_register_device(imx_sc_rtc);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
+	if (ret)
 		return ret;
-	}
 
 	imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier);
 

drivers/rtc/rtc-imxdi.c

@@ -740,7 +740,6 @@ static void dryice_work(struct work_struct *work)
  */
 static int __init dryice_rtc_probe(struct platform_device *pdev)
 {
-	struct resource *res;
 	struct imxdi_dev *imxdi;
 	int norm_irq, sec_irq;
 	int rc;
@@ -751,8 +750,7 @@ static int __init dryice_rtc_probe(struct platform_device *pdev)
 
 	imxdi->pdev = pdev;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	imxdi->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+	imxdi->ioaddr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(imxdi->ioaddr))
 		return PTR_ERR(imxdi->ioaddr);
 

drivers/rtc/rtc-isl12026.c

@@ -454,9 +454,9 @@ static int isl12026_probe_new(struct i2c_client *client)
 
 	isl12026_force_power_modes(client);
 
-	priv->nvm_client = i2c_new_dummy(client->adapter, ISL12026_EEPROM_ADDR);
-	if (!priv->nvm_client)
-		return -ENOMEM;
+	priv->nvm_client = i2c_new_dummy_device(client->adapter, ISL12026_EEPROM_ADDR);
+	if (IS_ERR(priv->nvm_client))
+		return PTR_ERR(priv->nvm_client);
 
 	priv->rtc = devm_rtc_allocate_device(&client->dev);
 	ret = PTR_ERR_OR_ZERO(priv->rtc);

drivers/rtc/rtc-jz4740.c

@@ -323,10 +323,8 @@ static int jz4740_rtc_probe(struct platform_device *pdev)
 		rtc->type = id->driver_data;
 
 	rtc->irq = platform_get_irq(pdev, 0);
-	if (rtc->irq < 0) {
-		dev_err(&pdev->dev, "Failed to get platform irq\n");
+	if (rtc->irq < 0)
 		return -ENOENT;
-	}
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	rtc->base = devm_ioremap_resource(&pdev->dev, mem);
@@ -362,10 +360,8 @@ static int jz4740_rtc_probe(struct platform_device *pdev)
 	rtc->rtc->range_max = U32_MAX;
 
 	ret = rtc_register_device(rtc->rtc);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to register rtc device: %d\n", ret);
+	if (ret)
 		return ret;
-	}
 
 	ret = devm_request_irq(&pdev->dev, rtc->irq, jz4740_rtc_irq, 0,
 				pdev->name, rtc);

drivers/rtc/rtc-max77686.c

@@ -673,11 +673,8 @@ static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
 		struct platform_device *pdev = to_platform_device(info->dev);
 
 		info->rtc_irq = platform_get_irq(pdev, 0);
-		if (info->rtc_irq < 0) {
-			dev_err(info->dev, "Failed to get rtc interrupts: %d\n",
-				info->rtc_irq);
+		if (info->rtc_irq < 0)
 			return info->rtc_irq;
-		}
 	} else {
 		info->rtc_irq =  parent_i2c->irq;
 	}
@@ -693,11 +690,11 @@ static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
 		goto add_rtc_irq;
 	}
 
-	info->rtc = i2c_new_dummy(parent_i2c->adapter,
-				  info->drv_data->rtc_i2c_addr);
-	if (!info->rtc) {
+	info->rtc = devm_i2c_new_dummy_device(info->dev, parent_i2c->adapter,
+					      info->drv_data->rtc_i2c_addr);
+	if (IS_ERR(info->rtc)) {
 		dev_err(info->dev, "Failed to allocate I2C device for RTC\n");
-		return -ENODEV;
+		return PTR_ERR(info->rtc);
 	}
 
 	info->rtc_regmap = devm_regmap_init_i2c(info->rtc,
@@ -705,7 +702,7 @@ static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
 	if (IS_ERR(info->rtc_regmap)) {
 		ret = PTR_ERR(info->rtc_regmap);
 		dev_err(info->dev, "Failed to allocate RTC regmap: %d\n", ret);
-		goto err_unregister_i2c;
+		return ret;
 	}
 
 add_rtc_irq:
@@ -715,15 +712,10 @@ static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
 				  &info->rtc_irq_data);
 	if (ret < 0) {
 		dev_err(info->dev, "Failed to add RTC irq chip: %d\n", ret);
-		goto err_unregister_i2c;
+		return ret;
 	}
 
 	return 0;
-
-err_unregister_i2c:
-	if (info->rtc)
-		i2c_unregister_device(info->rtc);
-	return ret;
 }
 
 static int max77686_rtc_probe(struct platform_device *pdev)
@@ -786,8 +778,6 @@ static int max77686_rtc_probe(struct platform_device *pdev)
 
 err_rtc:
 	regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
-	if (info->rtc)
-		i2c_unregister_device(info->rtc);
 
 	return ret;
 }
@@ -798,8 +788,6 @@ static int max77686_rtc_remove(struct platform_device *pdev)
 
 	free_irq(info->virq, info);
 	regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
-	if (info->rtc)
-		i2c_unregister_device(info->rtc);
 
 	return 0;
 }

drivers/rtc/rtc-meson-vrtc.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
+ */
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/time64.h>
+
+struct meson_vrtc_data {
+	void __iomem *io_alarm;
+	struct rtc_device *rtc;
+	unsigned long alarm_time;
+	bool enabled;
+};
+
+static int meson_vrtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct timespec64 time;
+
+	dev_dbg(dev, "%s\n", __func__);
+	ktime_get_raw_ts64(&time);
+	rtc_time64_to_tm(time.tv_sec, tm);
+
+	return 0;
+}
+
+static void meson_vrtc_set_wakeup_time(struct meson_vrtc_data *vrtc,
+				       unsigned long time)
+{
+	writel_relaxed(time, vrtc->io_alarm);
+}
+
+static int meson_vrtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+	struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "%s: alarm->enabled=%d\n", __func__, alarm->enabled);
+	if (alarm->enabled)
+		vrtc->alarm_time = rtc_tm_to_time64(&alarm->time);
+	else
+		vrtc->alarm_time = 0;
+
+	return 0;
+}
+
+static int meson_vrtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
+
+	vrtc->enabled = enabled;
+	return 0;
+}
+
+static const struct rtc_class_ops meson_vrtc_ops = {
+	.read_time = meson_vrtc_read_time,
+	.set_alarm = meson_vrtc_set_alarm,
+	.alarm_irq_enable = meson_vrtc_alarm_irq_enable,
+};
+
+static int meson_vrtc_probe(struct platform_device *pdev)
+{
+	struct meson_vrtc_data *vrtc;
+	int ret;
+
+	vrtc = devm_kzalloc(&pdev->dev, sizeof(*vrtc), GFP_KERNEL);
+	if (!vrtc)
+		return -ENOMEM;
+
+	vrtc->io_alarm = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(vrtc->io_alarm))
+		return PTR_ERR(vrtc->io_alarm);
+
+	device_init_wakeup(&pdev->dev, 1);
+
+	platform_set_drvdata(pdev, vrtc);
+
+	vrtc->rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(vrtc->rtc))
+		return PTR_ERR(vrtc->rtc);
+
+	vrtc->rtc->ops = &meson_vrtc_ops;
+	ret = rtc_register_device(vrtc->rtc);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int __maybe_unused meson_vrtc_suspend(struct device *dev)
+{
+	struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "%s\n", __func__);
+	if (vrtc->alarm_time) {
+		unsigned long local_time;
+		long alarm_secs;
+		struct timespec64 time;
+
+		ktime_get_raw_ts64(&time);
+		local_time = time.tv_sec;
+
+		dev_dbg(dev, "alarm_time = %lus, local_time=%lus\n",
+			vrtc->alarm_time, local_time);
+		alarm_secs = vrtc->alarm_time - local_time;
+		if (alarm_secs > 0) {
+			meson_vrtc_set_wakeup_time(vrtc, alarm_secs);
+			dev_dbg(dev, "system will wakeup in %lds.\n",
+				alarm_secs);
+		} else {
+			dev_err(dev, "alarm time already passed: %lds.\n",
+				alarm_secs);
+		}
+	}
+
+	return 0;
+}
+
+static int __maybe_unused meson_vrtc_resume(struct device *dev)
+{
+	struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "%s\n", __func__);
+
+	vrtc->alarm_time = 0;
+	meson_vrtc_set_wakeup_time(vrtc, 0);
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(meson_vrtc_pm_ops,
+			 meson_vrtc_suspend, meson_vrtc_resume);
+
+static const struct of_device_id meson_vrtc_dt_match[] = {
+	{ .compatible = "amlogic,meson-vrtc"},
+	{},
+};
+MODULE_DEVICE_TABLE(of, meson_vrtc_dt_match);
+
+static struct platform_driver meson_vrtc_driver = {
+	.probe = meson_vrtc_probe,
+	.driver = {
+		.name = "meson-vrtc",
+		.of_match_table = meson_vrtc_dt_match,
+		.pm = &meson_vrtc_pm_ops,
+	},
+};
+
+module_platform_driver(meson_vrtc_driver);
+
+MODULE_DESCRIPTION("Amlogic Virtual Wakeup RTC Timer driver");
+MODULE_LICENSE("GPL");

drivers/rtc/rtc-mt6397.c

@@ -343,10 +343,8 @@ static int mtk_rtc_probe(struct platform_device *pdev)
 	rtc->rtc_dev->ops = &mtk_rtc_ops;
 
 	ret = rtc_register_device(rtc->rtc_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "register rtc device failed\n");
+	if (ret)
 		goto out_free_irq;
-	}
 
 	return 0;
 

drivers/rtc/rtc-mt7622.c

@@ -329,7 +329,6 @@ static int mtk_rtc_probe(struct platform_device *pdev)
 
 	hw->irq = platform_get_irq(pdev, 0);
 	if (hw->irq < 0) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
 		ret = hw->irq;
 		goto err;
 	}

drivers/rtc/rtc-mxc.c

@@ -184,8 +184,9 @@ static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit,
 	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr;
 	u32 reg;
+	unsigned long flags;
 
-	spin_lock_irq(&pdata->rtc->irq_lock);
+	spin_lock_irqsave(&pdata->rtc->irq_lock, flags);
 	reg = readw(ioaddr + RTC_RTCIENR);
 
 	if (enabled)
@@ -194,7 +195,7 @@ static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit,
 		reg &= ~bit;
 
 	writew(reg, ioaddr + RTC_RTCIENR);
-	spin_unlock_irq(&pdata->rtc->irq_lock);
+	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);
 }
 
 /* This function is the RTC interrupt service routine. */

drivers/rtc/rtc-mxc_v2.c

@@ -279,7 +279,6 @@ static int mxc_rtc_wait_for_flag(void __iomem *ioaddr, int flag)
 static int mxc_rtc_probe(struct platform_device *pdev)
 {
 	struct mxc_rtc_data *pdata;
-	struct resource *res;
 	void __iomem *ioaddr;
 	int ret = 0;
 
@@ -287,8 +286,7 @@ static int mxc_rtc_probe(struct platform_device *pdev)
 	if (!pdata)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+	pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pdata->ioaddr))
 		return PTR_ERR(pdata->ioaddr);
 

drivers/rtc/rtc-nuc900.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2008-2009 Nuvoton technology corporation.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/rtc.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/bcd.h>
-
-/* RTC Control Registers */
-#define REG_RTC_INIR		0x00
-#define REG_RTC_AER		0x04
-#define REG_RTC_FCR		0x08
-#define REG_RTC_TLR		0x0C
-#define REG_RTC_CLR		0x10
-#define REG_RTC_TSSR		0x14
-#define REG_RTC_DWR		0x18
-#define REG_RTC_TAR		0x1C
-#define REG_RTC_CAR		0x20
-#define REG_RTC_LIR		0x24
-#define REG_RTC_RIER		0x28
-#define REG_RTC_RIIR		0x2C
-#define REG_RTC_TTR		0x30
-
-#define RTCSET			0x01
-#define AERRWENB		0x10000
-#define INIRRESET		0xa5eb1357
-#define AERPOWERON		0xA965
-#define AERPOWEROFF		0x0000
-#define LEAPYEAR		0x0001
-#define TICKENB			0x80
-#define TICKINTENB		0x0002
-#define ALARMINTENB		0x0001
-#define MODE24			0x0001
-
-struct nuc900_rtc {
-	int			irq_num;
-	void __iomem		*rtc_reg;
-	struct rtc_device	*rtcdev;
-};
-
-struct nuc900_bcd_time {
-	int bcd_sec;
-	int bcd_min;
-	int bcd_hour;
-	int bcd_mday;
-	int bcd_mon;
-	int bcd_year;
-};
-
-static irqreturn_t nuc900_rtc_interrupt(int irq, void *_rtc)
-{
-	struct nuc900_rtc *rtc = _rtc;
-	unsigned long events = 0, rtc_irq;
-
-	rtc_irq = __raw_readl(rtc->rtc_reg + REG_RTC_RIIR);
-
-	if (rtc_irq & ALARMINTENB) {
-		rtc_irq &= ~ALARMINTENB;
-		__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
-		events |= RTC_AF | RTC_IRQF;
-	}
-
-	if (rtc_irq & TICKINTENB) {
-		rtc_irq &= ~TICKINTENB;
-		__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
-		events |= RTC_UF | RTC_IRQF;
-	}
-
-	rtc_update_irq(rtc->rtcdev, 1, events);
-
-	return IRQ_HANDLED;
-}
-
-static int *check_rtc_access_enable(struct nuc900_rtc *nuc900_rtc)
-{
-	unsigned int timeout = 0x1000;
-	__raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR);
-
-	mdelay(10);
-
-	__raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER);
-
-	while (!(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB)
-								&& --timeout)
-		mdelay(1);
-
-	if (!timeout)
-		return ERR_PTR(-EPERM);
-
-	return NULL;
-}
-
-static void nuc900_rtc_bcd2bin(unsigned int timereg,
-			       unsigned int calreg, struct rtc_time *tm)
-{
-	tm->tm_mday	= bcd2bin(calreg >> 0);
-	tm->tm_mon	= bcd2bin(calreg >> 8);
-	tm->tm_year	= bcd2bin(calreg >> 16) + 100;
-
-	tm->tm_sec	= bcd2bin(timereg >> 0);
-	tm->tm_min	= bcd2bin(timereg >> 8);
-	tm->tm_hour	= bcd2bin(timereg >> 16);
-}
-
-static void nuc900_rtc_bin2bcd(struct device *dev, struct rtc_time *settm,
-						struct nuc900_bcd_time *gettm)
-{
-	gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0;
-	gettm->bcd_mon  = bin2bcd(settm->tm_mon) << 8;
-
-	if (settm->tm_year < 100) {
-		dev_warn(dev, "The year will be between 1970-1999, right?\n");
-		gettm->bcd_year = bin2bcd(settm->tm_year) << 16;
-	} else {
-		gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16;
-	}
-
-	gettm->bcd_sec  = bin2bcd(settm->tm_sec) << 0;
-	gettm->bcd_min  = bin2bcd(settm->tm_min) << 8;
-	gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16;
-}
-
-static int nuc900_alarm_irq_enable(struct device *dev, unsigned int enabled)
-{
-	struct nuc900_rtc *rtc = dev_get_drvdata(dev);
-
-	if (enabled)
-		__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|
-				(ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
-	else
-		__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)&
-				(~ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
-
-	return 0;
-}
-
-static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
-	struct nuc900_rtc *rtc = dev_get_drvdata(dev);
-	unsigned int timeval, clrval;
-
-	timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR);
-	clrval	= __raw_readl(rtc->rtc_reg + REG_RTC_CLR);
-
-	nuc900_rtc_bcd2bin(timeval, clrval, tm);
-
-	return 0;
-}
-
-static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
-	struct nuc900_rtc *rtc = dev_get_drvdata(dev);
-	struct nuc900_bcd_time gettm;
-	unsigned long val;
-	int *err;
-
-	nuc900_rtc_bin2bcd(dev, tm, &gettm);
-
-	err = check_rtc_access_enable(rtc);
-	if (IS_ERR(err))
-		return PTR_ERR(err);
-
-	val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year;
-	__raw_writel(val, rtc->rtc_reg + REG_RTC_CLR);
-
-	val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour;
-	__raw_writel(val, rtc->rtc_reg + REG_RTC_TLR);
-
-	return 0;
-}
-
-static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
-	struct nuc900_rtc *rtc = dev_get_drvdata(dev);
-	unsigned int timeval, carval;
-
-	timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR);
-	carval	= __raw_readl(rtc->rtc_reg + REG_RTC_CAR);
-
-	nuc900_rtc_bcd2bin(timeval, carval, &alrm->time);
-
-	return rtc_valid_tm(&alrm->time);
-}
-
-static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
-	struct nuc900_rtc *rtc = dev_get_drvdata(dev);
-	struct nuc900_bcd_time tm;
-	unsigned long val;
-	int *err;
-
-	nuc900_rtc_bin2bcd(dev, &alrm->time, &tm);
-
-	err = check_rtc_access_enable(rtc);
-	if (IS_ERR(err))
-		return PTR_ERR(err);
-
-	val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year;
-	__raw_writel(val, rtc->rtc_reg + REG_RTC_CAR);
-
-	val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour;
-	__raw_writel(val, rtc->rtc_reg + REG_RTC_TAR);
-
-	return 0;
-}
-
-static const struct rtc_class_ops nuc900_rtc_ops = {
-	.read_time = nuc900_rtc_read_time,
-	.set_time = nuc900_rtc_set_time,
-	.read_alarm = nuc900_rtc_read_alarm,
-	.set_alarm = nuc900_rtc_set_alarm,
-	.alarm_irq_enable = nuc900_alarm_irq_enable,
-};
-
-static int __init nuc900_rtc_probe(struct platform_device *pdev)
-{
-	struct resource *res;
-	struct nuc900_rtc *nuc900_rtc;
-
-	nuc900_rtc = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_rtc),
-				GFP_KERNEL);
-	if (!nuc900_rtc)
-		return -ENOMEM;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	nuc900_rtc->rtc_reg = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(nuc900_rtc->rtc_reg))
-		return PTR_ERR(nuc900_rtc->rtc_reg);
-
-	platform_set_drvdata(pdev, nuc900_rtc);
-
-	nuc900_rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
-						&nuc900_rtc_ops, THIS_MODULE);
-	if (IS_ERR(nuc900_rtc->rtcdev)) {
-		dev_err(&pdev->dev, "rtc device register failed\n");
-		return PTR_ERR(nuc900_rtc->rtcdev);
-	}
-
-	__raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24,
-					nuc900_rtc->rtc_reg + REG_RTC_TSSR);
-
-	nuc900_rtc->irq_num = platform_get_irq(pdev, 0);
-	if (devm_request_irq(&pdev->dev, nuc900_rtc->irq_num,
-			nuc900_rtc_interrupt, 0, "nuc900rtc", nuc900_rtc)) {
-		dev_err(&pdev->dev, "NUC900 RTC request irq failed\n");
-		return -EBUSY;
-	}
-
-	return 0;
-}
-
-static struct platform_driver nuc900_rtc_driver = {
-	.driver		= {
-		.name	= "nuc900-rtc",
-	},
-};
-
-module_platform_driver_probe(nuc900_rtc_driver, nuc900_rtc_probe);
-
-MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
-MODULE_DESCRIPTION("nuc910/nuc920 RTC driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:nuc900-rtc");

drivers/rtc/rtc-pcf85363.c

@@ -166,7 +166,12 @@ static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	buf[DT_YEARS] = bin2bcd(tm->tm_year % 100);
 
 	ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN,
-				tmp, sizeof(tmp));
+				tmp, 2);
+	if (ret)
+		return ret;
+
+	ret = regmap_bulk_write(pcf85363->regmap, DT_100THS,
+				buf, sizeof(tmp) - 2);
 	if (ret)
 		return ret;
 

drivers/rtc/rtc-pcf8563.c

@@ -196,8 +196,9 @@ static irqreturn_t pcf8563_irq(int irq, void *dev_id)
  * In the routines that deal directly with the pcf8563 hardware, we use
  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
  */
-static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
+static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
+	struct i2c_client *client = to_i2c_client(dev);
 	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
 	unsigned char buf[9];
 	int err;
@@ -228,9 +229,7 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 	tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
 	tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
 	tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
-	tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
-	if (tm->tm_year < 70)
-		tm->tm_year += 100;	/* assume we are in 1970...2069 */
+	tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]) + 100;
 	/* detect the polarity heuristically. see note above. */
 	pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
 		(tm->tm_year >= 100) : (tm->tm_year < 100);
@@ -244,8 +243,9 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 	return 0;
 }
 
-static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
+static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
+	struct i2c_client *client = to_i2c_client(dev);
 	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
 	unsigned char buf[9];
 
@@ -266,7 +266,7 @@ static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 	buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
 
 	/* year and century */
-	buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
+	buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year - 100);
 	if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
 		buf[PCF8563_REG_MO] |= PCF8563_MO_C;
 
@@ -299,8 +299,8 @@ static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long
 		 * because of the cached voltage_low value but do it
 		 * anyway for consistency.
 		 */
-		if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
-			pcf8563_set_datetime(to_i2c_client(dev), &tm);
+		if (pcf8563_rtc_read_time(dev, &tm))
+			pcf8563_rtc_set_time(dev, &tm);
 
 		/* Clear the cached value. */
 		pcf8563->voltage_low = 0;
@@ -314,16 +314,6 @@ static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long
 #define pcf8563_rtc_ioctl NULL
 #endif
 
-static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
-	return pcf8563_get_datetime(to_i2c_client(dev), tm);
-}
-
-static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
-	return pcf8563_set_datetime(to_i2c_client(dev), tm);
-}
-
 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
 {
 	struct i2c_client *client = to_i2c_client(dev);
@@ -591,13 +581,17 @@ static int pcf8563_probe(struct i2c_client *client,
 		return err;
 	}
 
-	pcf8563->rtc = devm_rtc_device_register(&client->dev,
-				pcf8563_driver.driver.name,
-				&pcf8563_rtc_ops, THIS_MODULE);
-
+	pcf8563->rtc = devm_rtc_allocate_device(&client->dev);
 	if (IS_ERR(pcf8563->rtc))
 		return PTR_ERR(pcf8563->rtc);
 
+	pcf8563->rtc->ops = &pcf8563_rtc_ops;
+	/* the pcf8563 alarm only supports a minute accuracy */
+	pcf8563->rtc->uie_unsupported = 1;
+	pcf8563->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	pcf8563->rtc->range_max = RTC_TIMESTAMP_END_2099;
+	pcf8563->rtc->set_start_time = true;
+
 	if (client->irq > 0) {
 		err = devm_request_threaded_irq(&client->dev, client->irq,
 				NULL, pcf8563_irq,
@@ -608,17 +602,17 @@ static int pcf8563_probe(struct i2c_client *client,
 								client->irq);
 			return err;
 		}
-
 	}
 
+	err = rtc_register_device(pcf8563->rtc);
+	if (err)
+		return err;
+
 #ifdef CONFIG_COMMON_CLK
 	/* register clk in common clk framework */
 	pcf8563_clkout_register_clk(pcf8563);
 #endif
 
-	/* the pcf8563 alarm only supports a minute accuracy */
-	pcf8563->rtc->uie_unsupported = 1;
-
 	return 0;
 }
 
@@ -632,6 +626,8 @@ MODULE_DEVICE_TABLE(i2c, pcf8563_id);
 #ifdef CONFIG_OF
 static const struct of_device_id pcf8563_of_match[] = {
 	{ .compatible = "nxp,pcf8563" },
+	{ .compatible = "epson,rtc8564" },
+	{ .compatible = "microcrystal,rv8564" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, pcf8563_of_match);

drivers/rtc/rtc-pic32.c

@@ -308,10 +308,8 @@ static int pic32_rtc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, pdata);
 
 	pdata->alarm_irq = platform_get_irq(pdev, 0);
-	if (pdata->alarm_irq < 0) {
-		dev_err(&pdev->dev, "no irq for alarm\n");
+	if (pdata->alarm_irq < 0)
 		return pdata->alarm_irq;
-	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);

drivers/rtc/rtc-pm8xxx.c

@@ -468,10 +468,8 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
 	}
 
 	rtc_dd->rtc_alarm_irq = platform_get_irq(pdev, 0);
-	if (rtc_dd->rtc_alarm_irq < 0) {
-		dev_err(&pdev->dev, "Alarm IRQ resource absent!\n");
+	if (rtc_dd->rtc_alarm_irq < 0)
 		return -ENXIO;
-	}
 
 	rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
 						      "allow-set-time");

drivers/rtc/rtc-puv3.c

@@ -186,16 +186,12 @@ static int puv3_rtc_probe(struct platform_device *pdev)
 
 	/* find the IRQs */
 	puv3_rtc_tickno = platform_get_irq(pdev, 1);
-	if (puv3_rtc_tickno < 0) {
-		dev_err(&pdev->dev, "no irq for rtc tick\n");
+	if (puv3_rtc_tickno < 0)
 		return -ENOENT;
-	}
 
 	puv3_rtc_alarmno = platform_get_irq(pdev, 0);
-	if (puv3_rtc_alarmno < 0) {
-		dev_err(&pdev->dev, "no irq for alarm\n");
+	if (puv3_rtc_alarmno < 0)
 		return -ENOENT;
-	}
 
 	dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n",
 		 puv3_rtc_tickno, puv3_rtc_alarmno);
@@ -239,10 +235,8 @@ static int puv3_rtc_probe(struct platform_device *pdev)
 	/* register RTC and exit */
 	rtc->ops = &puv3_rtcops;
 	ret = rtc_register_device(rtc);
-	if (ret) {
-		dev_err(&pdev->dev, "cannot attach rtc\n");
+	if (ret)
 		goto err_nortc;
-	}
 
 	/* platform setup code should have handled this; sigh */
 	if (!device_can_wakeup(&pdev->dev))

drivers/rtc/rtc-pxa.c

@@ -324,15 +324,11 @@ static int __init pxa_rtc_probe(struct platform_device *pdev)
 	}
 
 	sa1100_rtc->irq_1hz = platform_get_irq(pdev, 0);
-	if (sa1100_rtc->irq_1hz < 0) {
-		dev_err(dev, "No 1Hz IRQ resource defined\n");
+	if (sa1100_rtc->irq_1hz < 0)
 		return -ENXIO;
-	}
 	sa1100_rtc->irq_alarm = platform_get_irq(pdev, 1);
-	if (sa1100_rtc->irq_alarm < 0) {
-		dev_err(dev, "No alarm IRQ resource defined\n");
+	if (sa1100_rtc->irq_alarm < 0)
 		return -ENXIO;
-	}
 
 	pxa_rtc->base = devm_ioremap(dev, pxa_rtc->ress->start,
 				resource_size(pxa_rtc->ress));

drivers/rtc/rtc-rk808.c

@@ -434,12 +434,8 @@ static int rk808_rtc_probe(struct platform_device *pdev)
 	rk808_rtc->rtc->ops = &rk808_rtc_ops;
 
 	rk808_rtc->irq = platform_get_irq(pdev, 0);
-	if (rk808_rtc->irq < 0) {
-		if (rk808_rtc->irq != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "Wake up is not possible as irq = %d\n",
-				rk808_rtc->irq);
+	if (rk808_rtc->irq < 0)
 		return rk808_rtc->irq;
-	}
 
 	/* request alarm irq of rk808 */
 	ret = devm_request_threaded_irq(&pdev->dev, rk808_rtc->irq, NULL,

drivers/rtc/rtc-rv3028.c

@@ -639,9 +639,8 @@ static int rv3028_probe(struct i2c_client *client)
 		dev_warn(&client->dev, "An alarm may have been missed.\n");
 
 	rv3028->rtc = devm_rtc_allocate_device(&client->dev);
-	if (IS_ERR(rv3028->rtc)) {
+	if (IS_ERR(rv3028->rtc))
 		return PTR_ERR(rv3028->rtc);
-	}
 
 	if (client->irq > 0) {
 		ret = devm_request_threaded_irq(&client->dev, client->irq,

drivers/rtc/rtc-rv3029c2.c

@@ -278,13 +278,13 @@ static int rv3029_eeprom_read(struct device *dev, u8 reg,
 static int rv3029_eeprom_write(struct device *dev, u8 reg,
 			       u8 const buf[], size_t len)
 {
-	int ret;
+	int ret, err;
 	size_t i;
 	u8 tmp;
 
-	ret = rv3029_eeprom_enter(dev);
-	if (ret < 0)
-		return ret;
+	err = rv3029_eeprom_enter(dev);
+	if (err < 0)
+		return err;
 
 	for (i = 0; i < len; i++, reg++) {
 		ret = rv3029_read_regs(dev, reg, &tmp, 1);
@@ -300,11 +300,11 @@ static int rv3029_eeprom_write(struct device *dev, u8 reg,
 			break;
 	}
 
-	ret = rv3029_eeprom_exit(dev);
-	if (ret < 0)
-		return ret;
+	err = rv3029_eeprom_exit(dev);
+	if (err < 0)
+		return err;
 
-	return 0;
+	return ret;
 }
 
 static int rv3029_eeprom_update_bits(struct device *dev,

drivers/rtc/rtc-rv8803.c

@@ -564,9 +564,8 @@ static int rv8803_probe(struct i2c_client *client,
 		dev_warn(&client->dev, "An alarm maybe have been missed.\n");
 
 	rv8803->rtc = devm_rtc_allocate_device(&client->dev);
-	if (IS_ERR(rv8803->rtc)) {
+	if (IS_ERR(rv8803->rtc))
 		return PTR_ERR(rv8803->rtc);
-	}
 
 	if (client->irq > 0) {
 		err = devm_request_threaded_irq(&client->dev, client->irq,

drivers/rtc/rtc-s35390a.c

@@ -434,37 +434,32 @@ static int s35390a_probe(struct i2c_client *client,
 	char buf, status1;
 	struct device *dev = &client->dev;
 
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
-		err = -ENODEV;
-		goto exit;
-	}
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+		return -ENODEV;
 
 	s35390a = devm_kzalloc(dev, sizeof(struct s35390a), GFP_KERNEL);
-	if (!s35390a) {
-		err = -ENOMEM;
-		goto exit;
-	}
+	if (!s35390a)
+		return -ENOMEM;
 
 	s35390a->client[0] = client;
 	i2c_set_clientdata(client, s35390a);
 
 	/* This chip uses multiple addresses, use dummy devices for them */
 	for (i = 1; i < 8; ++i) {
-		s35390a->client[i] = i2c_new_dummy(client->adapter,
-					client->addr + i);
-		if (!s35390a->client[i]) {
+		s35390a->client[i] = devm_i2c_new_dummy_device(dev,
+							       client->adapter,
+							       client->addr + i);
+		if (IS_ERR(s35390a->client[i])) {
 			dev_err(dev, "Address %02x unavailable\n",
 				client->addr + i);
-			err = -EBUSY;
-			goto exit_dummy;
+			return PTR_ERR(s35390a->client[i]);
 		}
 	}
 
 	err_read = s35390a_read_status(s35390a, &status1);
 	if (err_read < 0) {
-		err = err_read;
 		dev_err(dev, "error resetting chip\n");
-		goto exit_dummy;
+		return err_read;
 	}
 
 	if (status1 & S35390A_FLAG_24H)
@@ -478,13 +473,13 @@ static int s35390a_probe(struct i2c_client *client,
 		err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &buf, 1);
 		if (err < 0) {
 			dev_err(dev, "error disabling alarm");
-			goto exit_dummy;
+			return err;
 		}
 	} else {
 		err = s35390a_disable_test_mode(s35390a);
 		if (err < 0) {
 			dev_err(dev, "error disabling test mode\n");
-			goto exit_dummy;
+			return err;
 		}
 	}
 
@@ -493,10 +488,8 @@ static int s35390a_probe(struct i2c_client *client,
 	s35390a->rtc = devm_rtc_device_register(dev, s35390a_driver.driver.name,
 						&s35390a_rtc_ops, THIS_MODULE);
 
-	if (IS_ERR(s35390a->rtc)) {
-		err = PTR_ERR(s35390a->rtc);
-		goto exit_dummy;
-	}
+	if (IS_ERR(s35390a->rtc))
+		return PTR_ERR(s35390a->rtc);
 
 	/* supports per-minute alarms only, therefore set uie_unsupported */
 	s35390a->rtc->uie_unsupported = 1;
@@ -505,26 +498,6 @@ static int s35390a_probe(struct i2c_client *client,
 		rtc_update_irq(s35390a->rtc, 1, RTC_AF);
 
 	return 0;
-
-exit_dummy:
-	for (i = 1; i < 8; ++i)
-		if (s35390a->client[i])
-			i2c_unregister_device(s35390a->client[i]);
-
-exit:
-	return err;
-}
-
-static int s35390a_remove(struct i2c_client *client)
-{
-	unsigned int i;
-	struct s35390a *s35390a = i2c_get_clientdata(client);
-
-	for (i = 1; i < 8; ++i)
-		if (s35390a->client[i])
-			i2c_unregister_device(s35390a->client[i]);
-
-	return 0;
 }
 
 static struct i2c_driver s35390a_driver = {
@@ -533,7 +506,6 @@ static struct i2c_driver s35390a_driver = {
 		.of_match_table = of_match_ptr(s35390a_of_match),
 	},
 	.probe		= s35390a_probe,
-	.remove		= s35390a_remove,
 	.id_table	= s35390a_id,
 };
 

drivers/rtc/rtc-s3c.c

@@ -453,10 +453,8 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 
 	/* find the IRQs */
 	info->irq_tick = platform_get_irq(pdev, 1);
-	if (info->irq_tick < 0) {
-		dev_err(&pdev->dev, "no irq for rtc tick\n");
+	if (info->irq_tick < 0)
 		return info->irq_tick;
-	}
 
 	info->dev = &pdev->dev;
 	info->data = of_device_get_match_data(&pdev->dev);
@@ -470,10 +468,8 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, info);
 
 	info->irq_alarm = platform_get_irq(pdev, 0);
-	if (info->irq_alarm < 0) {
-		dev_err(&pdev->dev, "no irq for alarm\n");
+	if (info->irq_alarm < 0)
 		return info->irq_alarm;
-	}
 
 	dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
 		info->irq_tick, info->irq_alarm);

drivers/rtc/rtc-s5m.c

@@ -760,10 +760,10 @@ static int s5m_rtc_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	info->i2c = i2c_new_dummy(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
-	if (!info->i2c) {
+	info->i2c = i2c_new_dummy_device(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
+	if (IS_ERR(info->i2c)) {
 		dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
-		return -ENODEV;
+		return PTR_ERR(info->i2c);
 	}
 
 	info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);

drivers/rtc/rtc-sc27xx.c

@@ -138,7 +138,7 @@ static int sprd_rtc_lock_alarm(struct sprd_rtc *rtc, bool lock)
 	if (ret)
 		return ret;
 
-	val &= ~(SPRD_RTC_ALMLOCK_MASK | SPRD_RTC_POWEROFF_ALM_FLAG);
+	val &= ~SPRD_RTC_ALMLOCK_MASK;
 	if (lock)
 		val |= SPRD_RTC_ALM_LOCK;
 	else
@@ -614,10 +614,8 @@ static int sprd_rtc_probe(struct platform_device *pdev)
 	}
 
 	rtc->irq = platform_get_irq(pdev, 0);
-	if (rtc->irq < 0) {
-		dev_err(&pdev->dev, "failed to get RTC irq number\n");
+	if (rtc->irq < 0)
 		return rtc->irq;
-	}
 
 	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(rtc->rtc))
@@ -656,7 +654,6 @@ static int sprd_rtc_probe(struct platform_device *pdev)
 	rtc->rtc->range_max = 5662310399LL;
 	ret = rtc_register_device(rtc->rtc);
 	if (ret) {
-		dev_err(&pdev->dev, "failed to register rtc device\n");
 		device_init_wakeup(&pdev->dev, 0);
 		return ret;
 	}

drivers/rtc/rtc-sd3078.c

@@ -193,10 +193,8 @@ static int sd3078_probe(struct i2c_client *client,
 	sd3078->rtc->range_max = RTC_TIMESTAMP_END_2099;
 
 	ret = rtc_register_device(sd3078->rtc);
-	if (ret) {
-		dev_err(&client->dev, "failed to register rtc device\n");
+	if (ret)
 		return ret;
-	}
 
 	sd3078_enable_reg_write(sd3078);
 

drivers/rtc/rtc-snvs.c

@@ -151,7 +151,7 @@ static int snvs_rtc_read_time(struct device *dev, struct rtc_time *tm)
 	struct snvs_rtc_data *data = dev_get_drvdata(dev);
 	unsigned long time = rtc_read_lp_counter(data);
 
-	rtc_time_to_tm(time, tm);
+	rtc_time64_to_tm(time, tm);
 
 	return 0;
 }
@@ -159,11 +159,9 @@ static int snvs_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int snvs_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct snvs_rtc_data *data = dev_get_drvdata(dev);
-	unsigned long time;
+	unsigned long time = rtc_tm_to_time64(tm);
 	int ret;
 
-	rtc_tm_to_time(tm, &time);
-
 	/* Disable RTC first */
 	ret = snvs_rtc_enable(data, false);
 	if (ret)
@@ -185,7 +183,7 @@ static int snvs_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	u32 lptar, lpsr;
 
 	regmap_read(data->regmap, data->offset + SNVS_LPTAR, &lptar);
-	rtc_time_to_tm(lptar, &alrm->time);
+	rtc_time64_to_tm(lptar, &alrm->time);
 
 	regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
 	alrm->pending = (lpsr & SNVS_LPSR_LPTA) ? 1 : 0;
@@ -207,12 +205,9 @@ static int snvs_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
 static int snvs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct snvs_rtc_data *data = dev_get_drvdata(dev);
-	struct rtc_time *alrm_tm = &alrm->time;
-	unsigned long time;
+	unsigned long time = rtc_tm_to_time64(&alrm->time);
 	int ret;
 
-	rtc_tm_to_time(alrm_tm, &time);
-
 	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_LPTA_EN, 0);
 	ret = rtc_write_sync_lp(data);
 	if (ret)
@@ -279,6 +274,10 @@ static int snvs_rtc_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
+	data->rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(data->rtc))
+		return PTR_ERR(data->rtc);
+
 	data->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap");
 
 	if (IS_ERR(data->regmap)) {
@@ -343,10 +342,10 @@ static int snvs_rtc_probe(struct platform_device *pdev)
 		goto error_rtc_device_register;
 	}
 
-	data->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
-					&snvs_rtc_ops, THIS_MODULE);
-	if (IS_ERR(data->rtc)) {
-		ret = PTR_ERR(data->rtc);
+	data->rtc->ops = &snvs_rtc_ops;
+	data->rtc->range_max = U32_MAX;
+	ret = rtc_register_device(data->rtc);
+	if (ret) {
 		dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
 		goto error_rtc_device_register;
 	}

drivers/rtc/rtc-spear.c

@@ -358,10 +358,8 @@ static int spear_rtc_probe(struct platform_device *pdev)
 
 	/* alarm irqs */
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "no update irq?\n");
+	if (irq < 0)
 		return irq;
-	}
 
 	status = devm_request_irq(&pdev->dev, irq, spear_rtc_irq, 0, pdev->name,
 			config);

drivers/rtc/rtc-stm32.c

@@ -776,7 +776,6 @@ static int stm32_rtc_probe(struct platform_device *pdev)
 
 	rtc->irq_alarm = platform_get_irq(pdev, 0);
 	if (rtc->irq_alarm <= 0) {
-		dev_err(&pdev->dev, "no alarm irq\n");
 		ret = rtc->irq_alarm;
 		goto err;
 	}

drivers/rtc/rtc-sun6i.c

@@ -32,9 +32,11 @@
 /* Control register */
 #define SUN6I_LOSC_CTRL				0x0000
 #define SUN6I_LOSC_CTRL_KEY			(0x16aa << 16)
+#define SUN6I_LOSC_CTRL_AUTO_SWT_BYPASS		BIT(15)
 #define SUN6I_LOSC_CTRL_ALM_DHMS_ACC		BIT(9)
 #define SUN6I_LOSC_CTRL_RTC_HMS_ACC		BIT(8)
 #define SUN6I_LOSC_CTRL_RTC_YMD_ACC		BIT(7)
+#define SUN6I_LOSC_CTRL_EXT_LOSC_EN		BIT(4)
 #define SUN6I_LOSC_CTRL_EXT_OSC			BIT(0)
 #define SUN6I_LOSC_CTRL_ACC_MASK		GENMASK(9, 7)
 
@@ -128,6 +130,8 @@ struct sun6i_rtc_clk_data {
 	unsigned int has_prescaler : 1;
 	unsigned int has_out_clk : 1;
 	unsigned int export_iosc : 1;
+	unsigned int has_losc_en : 1;
+	unsigned int has_auto_swt : 1;
 };
 
 struct sun6i_rtc_dev {
@@ -190,6 +194,10 @@ static int sun6i_rtc_osc_set_parent(struct clk_hw *hw, u8 index)
 	val &= ~SUN6I_LOSC_CTRL_EXT_OSC;
 	val |= SUN6I_LOSC_CTRL_KEY;
 	val |= index ? SUN6I_LOSC_CTRL_EXT_OSC : 0;
+	if (rtc->data->has_losc_en) {
+		val &= ~SUN6I_LOSC_CTRL_EXT_LOSC_EN;
+		val |= index ? SUN6I_LOSC_CTRL_EXT_LOSC_EN : 0;
+	}
 	writel(val, rtc->base + SUN6I_LOSC_CTRL);
 	spin_unlock_irqrestore(&rtc->lock, flags);
 
@@ -215,6 +223,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 	const char *iosc_name = "rtc-int-osc";
 	const char *clkout_name = "osc32k-out";
 	const char *parents[2];
+	u32 reg;
 
 	rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
 	if (!rtc)
@@ -235,9 +244,18 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 		goto err;
 	}
 
+	reg = SUN6I_LOSC_CTRL_KEY;
+	if (rtc->data->has_auto_swt) {
+		/* Bypass auto-switch to int osc, on ext losc failure */
+		reg |= SUN6I_LOSC_CTRL_AUTO_SWT_BYPASS;
+		writel(reg, rtc->base + SUN6I_LOSC_CTRL);
+	}
+
 	/* Switch to the external, more precise, oscillator */
-	writel(SUN6I_LOSC_CTRL_KEY | SUN6I_LOSC_CTRL_EXT_OSC,
-	       rtc->base + SUN6I_LOSC_CTRL);
+	reg |= SUN6I_LOSC_CTRL_EXT_OSC;
+	if (rtc->data->has_losc_en)
+		reg |= SUN6I_LOSC_CTRL_EXT_LOSC_EN;
+	writel(reg, rtc->base + SUN6I_LOSC_CTRL);
 
 	/* Yes, I know, this is ugly. */
 	sun6i_rtc = rtc;
@@ -345,6 +363,23 @@ CLK_OF_DECLARE_DRIVER(sun8i_h3_rtc_clk, "allwinner,sun8i-h3-rtc",
 CLK_OF_DECLARE_DRIVER(sun50i_h5_rtc_clk, "allwinner,sun50i-h5-rtc",
 		      sun8i_h3_rtc_clk_init);
 
+static const struct sun6i_rtc_clk_data sun50i_h6_rtc_data = {
+	.rc_osc_rate = 16000000,
+	.fixed_prescaler = 32,
+	.has_prescaler = 1,
+	.has_out_clk = 1,
+	.export_iosc = 1,
+	.has_losc_en = 1,
+	.has_auto_swt = 1,
+};
+
+static void __init sun50i_h6_rtc_clk_init(struct device_node *node)
+{
+	sun6i_rtc_clk_init(node, &sun50i_h6_rtc_data);
+}
+CLK_OF_DECLARE_DRIVER(sun50i_h6_rtc_clk, "allwinner,sun50i-h6-rtc",
+		      sun50i_h6_rtc_clk_init);
+
 static const struct sun6i_rtc_clk_data sun8i_v3_rtc_data = {
 	.rc_osc_rate = 32000,
 	.has_out_clk = 1,
@@ -598,6 +633,33 @@ static const struct rtc_class_ops sun6i_rtc_ops = {
 	.alarm_irq_enable	= sun6i_rtc_alarm_irq_enable
 };
 
+#ifdef CONFIG_PM_SLEEP
+/* Enable IRQ wake on suspend, to wake up from RTC. */
+static int sun6i_rtc_suspend(struct device *dev)
+{
+	struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(chip->irq);
+
+	return 0;
+}
+
+/* Disable IRQ wake on resume. */
+static int sun6i_rtc_resume(struct device *dev)
+{
+	struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(chip->irq);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(sun6i_rtc_pm_ops,
+	sun6i_rtc_suspend, sun6i_rtc_resume);
+
 static int sun6i_rtc_probe(struct platform_device *pdev)
 {
 	struct sun6i_rtc_dev *chip = sun6i_rtc;
@@ -610,10 +672,8 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
 	chip->dev = &pdev->dev;
 
 	chip->irq = platform_get_irq(pdev, 0);
-	if (chip->irq < 0) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
+	if (chip->irq < 0)
 		return chip->irq;
-	}
 
 	ret = devm_request_irq(&pdev->dev, chip->irq, sun6i_rtc_alarmirq,
 			       0, dev_name(&pdev->dev), chip);
@@ -650,6 +710,8 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
 
 	clk_prepare_enable(chip->losc);
 
+	device_init_wakeup(&pdev->dev, 1);
+
 	chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-sun6i",
 					     &sun6i_rtc_ops, THIS_MODULE);
 	if (IS_ERR(chip->rtc)) {
@@ -675,6 +737,7 @@ static const struct of_device_id sun6i_rtc_dt_ids[] = {
 	{ .compatible = "allwinner,sun8i-r40-rtc" },
 	{ .compatible = "allwinner,sun8i-v3-rtc" },
 	{ .compatible = "allwinner,sun50i-h5-rtc" },
+	{ .compatible = "allwinner,sun50i-h6-rtc" },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, sun6i_rtc_dt_ids);
@@ -684,6 +747,7 @@ static struct platform_driver sun6i_rtc_driver = {
 	.driver		= {
 		.name		= "sun6i-rtc",
 		.of_match_table = sun6i_rtc_dt_ids,
+		.pm = &sun6i_rtc_pm_ops,
 	},
 };
 builtin_platform_driver(sun6i_rtc_driver);

drivers/rtc/rtc-sunxi.c

@@ -442,10 +442,8 @@ static int sunxi_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(chip->base);
 
 	chip->irq = platform_get_irq(pdev, 0);
-	if (chip->irq < 0) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
+	if (chip->irq < 0)
 		return chip->irq;
-	}
 	ret = devm_request_irq(&pdev->dev, chip->irq, sunxi_rtc_alarmirq,
 			0, dev_name(&pdev->dev), chip);
 	if (ret) {
@@ -474,15 +472,7 @@ static int sunxi_rtc_probe(struct platform_device *pdev)
 
 	chip->rtc->ops = &sunxi_rtc_ops;
 
-	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;
+	return rtc_register_device(chip->rtc);
 }
 
 static struct platform_driver sunxi_rtc_driver = {

drivers/rtc/rtc-tegra.c

@@ -290,10 +290,8 @@ static int tegra_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(info->base);
 
 	ret = platform_get_irq(pdev, 0);
-	if (ret <= 0) {
-		dev_err(&pdev->dev, "failed to get platform IRQ: %d\n", ret);
+	if (ret <= 0)
 		return ret;
-	}
 
 	info->irq = ret;
 
@@ -334,10 +332,8 @@ static int tegra_rtc_probe(struct platform_device *pdev)
 	}
 
 	ret = rtc_register_device(info->rtc);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to register device: %d\n", ret);
+	if (ret)
 		goto disable_clk;
-	}
 
 	dev_notice(&pdev->dev, "Tegra internal Real Time Clock\n");
 

drivers/rtc/rtc-tps6586x.c

@@ -259,7 +259,6 @@ static int tps6586x_rtc_probe(struct platform_device *pdev)
 	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(rtc->rtc)) {
 		ret = PTR_ERR(rtc->rtc);
-		dev_err(&pdev->dev, "RTC allocate device: ret %d\n", ret);
 		goto fail_rtc_register;
 	}
 
@@ -280,10 +279,8 @@ static int tps6586x_rtc_probe(struct platform_device *pdev)
 	disable_irq(rtc->irq);
 
 	ret = rtc_register_device(rtc->rtc);
-	if (ret) {
-		dev_err(&pdev->dev, "RTC device register: ret %d\n", ret);
+	if (ret)
 		goto fail_rtc_register;
-	}
 
 	return 0;
 

drivers/rtc/rtc-tps65910.c

@@ -425,13 +425,7 @@ static int tps65910_rtc_probe(struct platform_device *pdev)
 	tps_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	tps_rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
 
-	ret = rtc_register_device(tps_rtc->rtc);
-	if (ret) {
-		dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
-		return ret;
-	}
-
-	return 0;
+	return rtc_register_device(tps_rtc->rtc);
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/rtc/rtc-vt8500.c

@@ -212,10 +212,8 @@ static int vt8500_rtc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, vt8500_rtc);
 
 	vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0);
-	if (vt8500_rtc->irq_alarm < 0) {
-		dev_err(&pdev->dev, "No alarm IRQ resource defined\n");
+	if (vt8500_rtc->irq_alarm < 0)
 		return vt8500_rtc->irq_alarm;
-	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	vt8500_rtc->regbase = devm_ioremap_resource(&pdev->dev, res);

drivers/rtc/rtc-xgene.c

@@ -157,10 +157,8 @@ static int xgene_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(pdata->rtc);
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
+	if (irq < 0)
 		return irq;
-	}
 	ret = devm_request_irq(&pdev->dev, irq, xgene_rtc_interrupt, 0,
 			       dev_name(&pdev->dev), pdata);
 	if (ret) {

drivers/rtc/rtc-zynqmp.c

@@ -218,10 +218,8 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(xrtcdev->reg_base);
 
 	xrtcdev->alarm_irq = platform_get_irq_byname(pdev, "alarm");
-	if (xrtcdev->alarm_irq < 0) {
-		dev_err(&pdev->dev, "no irq resource\n");
+	if (xrtcdev->alarm_irq < 0)
 		return xrtcdev->alarm_irq;
-	}
 	ret = devm_request_irq(&pdev->dev, xrtcdev->alarm_irq,
 			       xlnx_rtc_interrupt, 0,
 			       dev_name(&pdev->dev), xrtcdev);
@@ -231,10 +229,8 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 	}
 
 	xrtcdev->sec_irq = platform_get_irq_byname(pdev, "sec");
-	if (xrtcdev->sec_irq < 0) {
-		dev_err(&pdev->dev, "no irq resource\n");
+	if (xrtcdev->sec_irq < 0)
 		return xrtcdev->sec_irq;
-	}
 	ret = devm_request_irq(&pdev->dev, xrtcdev->sec_irq,
 			       xlnx_rtc_interrupt, 0,
 			       dev_name(&pdev->dev), xrtcdev);