Merge tag 'rtc-4.20' of git://git.kernel.org/pub/scm/linux/kernel/git…

…/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "This cycle, there were mostly non urgent fixes in drivers. I also
  finally unexported the non managed registration.

  Subsystem:

   - non devm managed registration is now removed from the driver API

   - all the unnecessary rtc_valid_tm() calls have been removed

  Drivers:

   - abx80X: watchdog support

   - cmos: fix non ACPI support

   - sc27xx: fix alarm support

   - Remove a possible sysfs race condition for ab8500, ds1307, ds1685,
     isl1208

   - Fix a possible race condition where an irq handler may be called
     before the rtc_device struct is allocated for mt6397, pl030,
     menelaus, armada38x"

* tag 'rtc-4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (54 commits)
  rtc: sc27xx: Always read normal alarm when registering RTC device
  rtc: sc27xx: Add check to see if need to enable the alarm interrupt
  rtc: sc27xx: Remove interrupts disable and clear in probe()
  rtc: sc27xx: Clear SPG value update interrupt status
  rtc: sc27xx: Set wakeup capability before registering rtc device
  rtc: s35390a: Change buf's type to u8 in s35390a_init
  rtc: ds1307: fix ds1339 wakealarm support
  rtc: ds1685: simplify getting .driver_data
  rtc: m41t80: mark expected switch fall-through
  rtc: tegra: Propagate errors from platform_get_irq()
  rtc: cmos: Remove the `use_acpi_alarm' module parameter for !ACPI
  rtc: cmos: Fix non-ACPI undefined reference to `hpet_rtc_interrupt'
  rtc: mv: let the core handle invalid alarms
  rtc: vr41xx: switch to rtc_time64_to_tm/rtc_tm_to_time64
  rtc: ab8500: remove useless check
  rtc: ab8500: let the core handle range
  rtc: ab8500: use rtc_add_group
  rtc: rs5c348: report error when time is invalid
  rtc: rs5c348: remove forward declaration
  rtc: rs5c348: remove useless label
  ...

arch/mips/Kconfig

@@ -75,7 +75,7 @@ config MIPS
 	select MODULES_USE_ELF_RELA if MODULES && 64BIT
 	select MODULES_USE_ELF_REL if MODULES
 	select PERF_USE_VMALLOC
-	select RTC_LIB if !MACH_LOONGSON64
+	select RTC_LIB
 	select SYSCTL_EXCEPTION_TRACE
 	select VIRT_TO_BUS
 	select NO_BOOTMEM

drivers/char/Kconfig

@@ -268,7 +268,7 @@ if RTC_LIB=n
 
 config RTC
 	tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)"
-	depends on ALPHA || (MIPS && MACH_LOONGSON64)
+	depends on ALPHA
 	---help---
 	  If you say Y here and create a character special file /dev/rtc with
 	  major number 10 and minor number 135 using mknod ("man mknod"), you

drivers/rtc/Kconfig

@@ -187,6 +187,7 @@ config RTC_DRV_ABB5ZES3
 
 config RTC_DRV_ABX80X
 	tristate "Abracon ABx80x"
+	select WATCHDOG_CORE if WATCHDOG
 	help
 	  If you say yes here you get support for Abracon AB080X and AB180X
 	  families of ultra-low-power  battery- and capacitor-backed real-time
@@ -1007,17 +1008,6 @@ config RTC_DRV_DS17885
 
 endchoice
 
-config RTC_DS1685_PROC_REGS
-	bool "Display register values in /proc"
-	depends on RTC_DRV_DS1685_FAMILY && PROC_FS
-	help
-	  Enable this to display a readout of all of the RTC registers in
-	  /proc/drivers/rtc.  Keep in mind that this can potentially lead
-	  to lost interrupts, as reading Control Register C will clear
-	  all pending IRQ flags.
-
-	  Unless you are debugging this driver, choose N.
-
 config RTC_DRV_DS1742
 	tristate "Maxim/Dallas DS1742/1743"
 	depends on HAS_IOMEM
@@ -1587,7 +1577,7 @@ config RTC_DRV_MPC5121
 
 config RTC_DRV_JZ4740
 	tristate "Ingenic JZ4740 SoC"
-	depends on MACH_INGENIC || COMPILE_TEST
+	depends on MIPS || COMPILE_TEST
 	help
 	  If you say yes here you get support for the Ingenic JZ47xx SoCs RTC
 	  controllers.

drivers/rtc/Makefile

@@ -36,9 +36,9 @@ obj-$(CONFIG_RTC_DRV_ASM9260)	+= rtc-asm9260.o
 obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
 obj-$(CONFIG_RTC_DRV_AT91SAM9)	+= rtc-at91sam9.o
 obj-$(CONFIG_RTC_DRV_AU1XXX)	+= rtc-au1xxx.o
-obj-$(CONFIG_RTC_DRV_BRCMSTB)	+= rtc-brcmstb-waketimer.o
 obj-$(CONFIG_RTC_DRV_BQ32K)	+= rtc-bq32k.o
 obj-$(CONFIG_RTC_DRV_BQ4802)	+= rtc-bq4802.o
+obj-$(CONFIG_RTC_DRV_BRCMSTB)	+= rtc-brcmstb-waketimer.o
 obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc-cmos.o
 obj-$(CONFIG_RTC_DRV_COH901331)	+= rtc-coh901331.o
 obj-$(CONFIG_RTC_DRV_CPCAP)	+= rtc-cpcap.o
@@ -71,17 +71,18 @@ obj-$(CONFIG_RTC_DRV_EP93XX)	+= rtc-ep93xx.o
 obj-$(CONFIG_RTC_DRV_FM3130)	+= rtc-fm3130.o
 obj-$(CONFIG_RTC_DRV_FTRTC010)	+= rtc-ftrtc010.o
 obj-$(CONFIG_RTC_DRV_GENERIC)	+= rtc-generic.o
+obj-$(CONFIG_RTC_DRV_GOLDFISH)	+= rtc-goldfish.o
 obj-$(CONFIG_RTC_DRV_HID_SENSOR_TIME) += rtc-hid-sensor-time.o
 obj-$(CONFIG_RTC_DRV_HYM8563)	+= rtc-hym8563.o
 obj-$(CONFIG_RTC_DRV_IMXDI)	+= rtc-imxdi.o
 obj-$(CONFIG_RTC_DRV_ISL12022)	+= rtc-isl12022.o
 obj-$(CONFIG_RTC_DRV_ISL12026)	+= rtc-isl12026.o
 obj-$(CONFIG_RTC_DRV_ISL1208)	+= rtc-isl1208.o
 obj-$(CONFIG_RTC_DRV_JZ4740)	+= rtc-jz4740.o
+obj-$(CONFIG_RTC_DRV_LOONGSON1)	+= rtc-ls1x.o
 obj-$(CONFIG_RTC_DRV_LP8788)	+= rtc-lp8788.o
 obj-$(CONFIG_RTC_DRV_LPC24XX)	+= rtc-lpc24xx.o
 obj-$(CONFIG_RTC_DRV_LPC32XX)	+= rtc-lpc32xx.o
-obj-$(CONFIG_RTC_DRV_LOONGSON1)	+= rtc-ls1x.o
 obj-$(CONFIG_RTC_DRV_M41T80)	+= rtc-m41t80.o
 obj-$(CONFIG_RTC_DRV_M41T93)	+= rtc-m41t93.o
 obj-$(CONFIG_RTC_DRV_M41T94)	+= rtc-m41t94.o
@@ -100,7 +101,6 @@ obj-$(CONFIG_RTC_DRV_MC13XXX)	+= rtc-mc13xxx.o
 obj-$(CONFIG_RTC_DRV_MCP795)	+= rtc-mcp795.o
 obj-$(CONFIG_RTC_DRV_MOXART)	+= rtc-moxart.o
 obj-$(CONFIG_RTC_DRV_MPC5121)	+= rtc-mpc5121.o
-obj-$(CONFIG_RTC_DRV_VRTC)	+= rtc-mrst.o
 obj-$(CONFIG_RTC_DRV_MSM6242)	+= rtc-msm6242.o
 obj-$(CONFIG_RTC_DRV_MT6397)	+= rtc-mt6397.o
 obj-$(CONFIG_RTC_DRV_MT7622)	+= rtc-mt7622.o
@@ -116,8 +116,8 @@ obj-$(CONFIG_RTC_DRV_PCF2123)	+= rtc-pcf2123.o
 obj-$(CONFIG_RTC_DRV_PCF2127)	+= rtc-pcf2127.o
 obj-$(CONFIG_RTC_DRV_PCF50633)	+= rtc-pcf50633.o
 obj-$(CONFIG_RTC_DRV_PCF85063)	+= rtc-pcf85063.o
-obj-$(CONFIG_RTC_DRV_PCF85363)	+= rtc-pcf85363.o
 obj-$(CONFIG_RTC_DRV_PCF8523)	+= rtc-pcf8523.o
+obj-$(CONFIG_RTC_DRV_PCF85363)	+= rtc-pcf85363.o
 obj-$(CONFIG_RTC_DRV_PCF8563)	+= rtc-pcf8563.o
 obj-$(CONFIG_RTC_DRV_PCF8583)	+= rtc-pcf8583.o
 obj-$(CONFIG_RTC_DRV_PIC32)	+= rtc-pic32.o
@@ -154,9 +154,9 @@ obj-$(CONFIG_RTC_DRV_SNVS)	+= rtc-snvs.o
 obj-$(CONFIG_RTC_DRV_SPEAR)	+= rtc-spear.o
 obj-$(CONFIG_RTC_DRV_STARFIRE)	+= rtc-starfire.o
 obj-$(CONFIG_RTC_DRV_STK17TA8)	+= rtc-stk17ta8.o
+obj-$(CONFIG_RTC_DRV_ST_LPC)	+= rtc-st-lpc.o
 obj-$(CONFIG_RTC_DRV_STM32) 	+= rtc-stm32.o
 obj-$(CONFIG_RTC_DRV_STMP)	+= rtc-stmp3xxx.o
-obj-$(CONFIG_RTC_DRV_ST_LPC)	+= rtc-st-lpc.o
 obj-$(CONFIG_RTC_DRV_SUN4V)	+= rtc-sun4v.o
 obj-$(CONFIG_RTC_DRV_SUN6I)	+= rtc-sun6i.o
 obj-$(CONFIG_RTC_DRV_SUNXI)	+= rtc-sunxi.o
@@ -169,10 +169,10 @@ obj-$(CONFIG_RTC_DRV_TWL4030)	+= rtc-twl.o
 obj-$(CONFIG_RTC_DRV_TX4939)	+= rtc-tx4939.o
 obj-$(CONFIG_RTC_DRV_V3020)	+= rtc-v3020.o
 obj-$(CONFIG_RTC_DRV_VR41XX)	+= rtc-vr41xx.o
+obj-$(CONFIG_RTC_DRV_VRTC)	+= rtc-mrst.o
 obj-$(CONFIG_RTC_DRV_VT8500)	+= rtc-vt8500.o
 obj-$(CONFIG_RTC_DRV_WM831X)	+= rtc-wm831x.o
 obj-$(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/class.c

@@ -286,9 +286,10 @@ static void rtc_device_get_offset(struct rtc_device *rtc)
  *
  * Returns the pointer to the new struct class device.
  */
-struct rtc_device *rtc_device_register(const char *name, struct device *dev,
-					const struct rtc_class_ops *ops,
-					struct module *owner)
+static struct rtc_device *rtc_device_register(const char *name,
+					      struct device *dev,
+					      const struct rtc_class_ops *ops,
+					      struct module *owner)
 {
 	struct rtc_device *rtc;
 	struct rtc_wkalrm alrm;
@@ -351,15 +352,13 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
 			name, err);
 	return ERR_PTR(err);
 }
-EXPORT_SYMBOL_GPL(rtc_device_register);
-
 
 /**
  * rtc_device_unregister - removes the previously registered RTC class device
  *
  * @rtc: the RTC class device to destroy
  */
-void rtc_device_unregister(struct rtc_device *rtc)
+static void rtc_device_unregister(struct rtc_device *rtc)
 {
 	mutex_lock(&rtc->ops_lock);
 	/*
@@ -372,7 +371,6 @@ void rtc_device_unregister(struct rtc_device *rtc)
 	mutex_unlock(&rtc->ops_lock);
 	put_device(&rtc->dev);
 }
-EXPORT_SYMBOL_GPL(rtc_device_unregister);
 
 static void devm_rtc_device_release(struct device *dev, void *res)
 {

drivers/rtc/interface.c

@@ -596,7 +596,6 @@ EXPORT_SYMBOL_GPL(rtc_update_irq_enable);
  * This function is called when an AIE, UIE or PIE mode interrupt
  * has occurred (or been emulated).
  *
- * Triggers the registered irq_task function callback.
  */
 void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode)
 {
@@ -741,7 +740,6 @@ static int rtc_update_hrtimer(struct rtc_device *rtc, int enabled)
 /**
  * rtc_irq_set_state - enable/disable 2^N Hz periodic IRQs
  * @rtc: the rtc device
- * @task: currently registered with rtc_irq_register()
  * @enabled: true to enable periodic IRQs
  * Context: any
  *
@@ -764,7 +762,6 @@ int rtc_irq_set_state(struct rtc_device *rtc, int enabled)
 /**
  * rtc_irq_set_freq - set 2^N Hz periodic IRQ frequency for IRQ
  * @rtc: the rtc device
- * @task: currently registered with rtc_irq_register()
  * @freq: positive frequency
  * Context: any
  *

drivers/rtc/rtc-ab8500.c

@@ -46,7 +46,6 @@
 #define RTC_STATUS_DATA			0x01
 
 #define COUNTS_PER_SEC			(0xF000 / 60)
-#define AB8500_RTC_EPOCH		2000
 
 static const u8 ab8500_rtc_time_regs[] = {
 	AB8500_RTC_WATCH_TMIN_HI_REG, AB8500_RTC_WATCH_TMIN_MID_REG,
@@ -59,23 +58,6 @@ static const u8 ab8500_rtc_alarm_regs[] = {
 	AB8500_RTC_ALRM_MIN_LOW_REG
 };
 
-/* Calculate the seconds from 1970 to 01-01-2000 00:00:00 */
-static unsigned long get_elapsed_seconds(int year)
-{
-	unsigned long secs;
-	struct rtc_time tm = {
-		.tm_year = year - 1900,
-		.tm_mday = 1,
-	};
-
-	/*
-	 * This function calculates secs from 1970 and not from
-	 * 1900, even if we supply the offset from year 1900.
-	 */
-	rtc_tm_to_time(&tm, &secs);
-	return secs;
-}
-
 static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	unsigned long timeout = jiffies + HZ;
@@ -118,9 +100,6 @@ static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
 	secs =	secs / COUNTS_PER_SEC;
 	secs =	secs + (mins * 60);
 
-	/* Add back the initially subtracted number of seconds */
-	secs += get_elapsed_seconds(AB8500_RTC_EPOCH);
-
 	rtc_time_to_tm(secs, tm);
 	return 0;
 }
@@ -131,21 +110,8 @@ static int ab8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)];
 	unsigned long no_secs, no_mins, secs = 0;
 
-	if (tm->tm_year < (AB8500_RTC_EPOCH - 1900)) {
-		dev_dbg(dev, "year should be equal to or greater than %d\n",
-				AB8500_RTC_EPOCH);
-		return -EINVAL;
-	}
-
-	/* Get the number of seconds since 1970 */
 	rtc_tm_to_time(tm, &secs);
 
-	/*
-	 * Convert it to the number of seconds since 01-01-2000 00:00:00, since
-	 * we only have a small counter in the RTC.
-	 */
-	secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
-
 	no_mins = secs / 60;
 
 	no_secs = secs % 60;
@@ -202,12 +168,9 @@ static int ab8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 	mins = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
 	secs = mins * 60;
 
-	/* Add back the initially subtracted number of seconds */
-	secs += get_elapsed_seconds(AB8500_RTC_EPOCH);
-
 	rtc_time_to_tm(secs, &alarm->time);
 
-	return rtc_valid_tm(&alarm->time);
+	return 0;
 }
 
 static int ab8500_rtc_irq_enable(struct device *dev, unsigned int enabled)
@@ -224,12 +187,6 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 	unsigned long mins, secs = 0, cursec = 0;
 	struct rtc_time curtm;
 
-	if (alarm->time.tm_year < (AB8500_RTC_EPOCH - 1900)) {
-		dev_dbg(dev, "year should be equal to or greater than %d\n",
-				AB8500_RTC_EPOCH);
-		return -EINVAL;
-	}
-
 	/* Get the number of seconds since 1970 */
 	rtc_tm_to_time(&alarm->time, &secs);
 
@@ -245,12 +202,6 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 		return -EINVAL;
 	}
 
-	/*
-	 * Convert it to the number of seconds since 01-01-2000 00:00:00, since
-	 * we only have a small counter in the RTC.
-	 */
-	secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
-
 	mins = secs / 60;
 
 	buf[2] = mins & 0xFF;
@@ -360,15 +311,14 @@ static DEVICE_ATTR(rtc_calibration, S_IRUGO | S_IWUSR,
 		   ab8500_sysfs_show_rtc_calibration,
 		   ab8500_sysfs_store_rtc_calibration);
 
-static int ab8500_sysfs_rtc_register(struct device *dev)
-{
-	return device_create_file(dev, &dev_attr_rtc_calibration);
-}
+static struct attribute *ab8500_rtc_attrs[] = {
+	&dev_attr_rtc_calibration.attr,
+	NULL
+};
 
-static void ab8500_sysfs_rtc_unregister(struct device *dev)
-{
-	device_remove_file(dev, &dev_attr_rtc_calibration);
-}
+static const struct attribute_group ab8500_rtc_sysfs_files = {
+	.attrs	= ab8500_rtc_attrs,
+};
 
 static irqreturn_t rtc_alarm_handler(int irq, void *data)
 {
@@ -429,14 +379,11 @@ static int ab8500_rtc_probe(struct platform_device *pdev)
 
 	device_init_wakeup(&pdev->dev, true);
 
-	rtc = devm_rtc_device_register(&pdev->dev, "ab8500-rtc",
-				(struct rtc_class_ops *)platid->driver_data,
-				THIS_MODULE);
-	if (IS_ERR(rtc)) {
-		dev_err(&pdev->dev, "Registration failed\n");
-		err = PTR_ERR(rtc);
-		return err;
-	}
+	rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+
+	rtc->ops = (struct rtc_class_ops *)platid->driver_data;
 
 	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 			rtc_alarm_handler, IRQF_ONESHOT,
@@ -447,22 +394,23 @@ static int ab8500_rtc_probe(struct platform_device *pdev)
 	dev_pm_set_wake_irq(&pdev->dev, irq);
 	platform_set_drvdata(pdev, rtc);
 
-	err = ab8500_sysfs_rtc_register(&pdev->dev);
-	if (err) {
-		dev_err(&pdev->dev, "sysfs RTC failed to register\n");
-		return err;
-	}
-
 	rtc->uie_unsupported = 1;
 
-	return 0;
+	rtc->range_max = (1ULL << 24) * 60 - 1; // 24-bit minutes + 59 secs
+	rtc->start_secs = RTC_TIMESTAMP_BEGIN_2000;
+	rtc->set_start_time = true;
+
+	err = rtc_add_group(rtc, &ab8500_rtc_sysfs_files);
+	if (err)
+		return err;
+
+	return rtc_register_device(rtc);
 }
 
 static int ab8500_rtc_remove(struct platform_device *pdev)
 {
 	dev_pm_clear_wake_irq(&pdev->dev);
 	device_init_wakeup(&pdev->dev, false);
-	ab8500_sysfs_rtc_unregister(&pdev->dev);
 
 	return 0;
 }