Merge tag 'rtc-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "Subsystem wide cleanups:
   - Use IS_ENABLED() instead of checking for built-in or module
   - remove useless DRV_VERSION
   - remove CLK_IS_ROOT
   - remove UIE signaling

  Drivers:
   - ds1302: rewritten to be a proper SPI device driver
   - m41t80: huge cleanup, alarm, wakelarm ans oscialltor failure
     detection support
   - rv3029: switch to regmap to handle rv3049, alarm support, fixes
   - zynqmp: enable switching to battery power, fixes
   - small fixes for at91sam9, da9053, ds1307, ds1685, ds3232, r2025,
     sa1100, snvs, stmp3xxx, tps6586x"

* tag 'rtc-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (40 commits)
  rtc: tps6586x: rename so module can be autoloaded
  rtc: rv3029: hide unused i2c device table
  rtc: rs5c372: r2025: fix check for 'oscillator halted' condition
  rtc: rv3029: add alarm IRQ
  rtc: rv3029: fix set_time function
  rtc: rv3029: fix alarm support
  rtc: rv3029: Remove some checks and warnings
  rtc: rv3029: Add support of RV3049
  rtc: rv3029: convert to use regmap
  rtc: rv3029: remove 'i2c' in functions names
  rtc: stmp3xxx: print message on error
  rtc: Use IS_ENABLED() instead of checking for built-in or module
  rtc: ds3232: fix call trace when rtc->ops_lock is used as NULL
  rtc: snvs: return error in case enable_irq_wake fails
  rtc: zynqmp: Update seconds time programming logic
  rtc: sa1100: DT spelling s/interrupt-name/interrupt-names/
  rtc: mc13xxx: remove UIE signaling
  rtc: mxc: remove UIE signaling
  rtc: ds1307: Remove CLK_IS_ROOT
  rtc: hym8563: Remove CLK_IS_ROOT
  ...

Documentation/devicetree/bindings/rtc/maxim-ds1302.txt

+* Maxim/Dallas Semiconductor DS-1302 RTC
+
+Simple device which could be used to store date/time between reboots.
+
+The device uses the standard MicroWire half-duplex transfer timing.
+Master output is set on low clock and sensed by the RTC on the rising
+edge. Master input is set by the RTC on the trailing edge and is sensed
+by the master on low clock.
+
+Required properties:
+
+- compatible : Should be "maxim,ds1302"
+
+Required SPI properties:
+
+- reg : Should be address of the device chip select within
+  the controller.
+
+- spi-max-frequency : DS-1302 has 500 kHz if powered at 2.2V,
+  and 2MHz if powered at 5V.
+
+- spi-3wire : The device has a shared signal IN/OUT line.
+
+- spi-lsb-first : DS-1302 requires least significant bit first
+  transfers.
+
+- spi-cs-high: DS-1302 has active high chip select line. This is
+  required unless inverted in hardware.
+
+Example:
+
+spi@901c {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	compatible = "icpdas,lp8841-spi-rtc";
+	reg = <0x901c 0x1>;
+
+	rtc@0 {
+		compatible = "maxim,ds1302";
+		reg = <0>;
+		spi-max-frequency = <500000>;
+		spi-3wire;
+		spi-lsb-first;
+		spi-cs-high;
+	};
+};

Documentation/devicetree/bindings/rtc/sa1100-rtc.txt

@@ -13,5 +13,5 @@ Example:
 		compatible = "mrvl,mmp-rtc";
 		reg = <0xd4010000 0x1000>;
 		interrupts = <5>, <6>;
-		interrupt-name = "rtc 1Hz", "rtc alarm";
+		interrupt-names = "rtc 1Hz", "rtc alarm";
 	};

drivers/rtc/Kconfig

@@ -573,24 +573,6 @@ config RTC_DRV_EM3027
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-em3027.
 
-config RTC_DRV_RV3029C2
-	tristate "Micro Crystal RV3029"
-	help
-	  If you say yes here you get support for the Micro Crystal
-	  RV3029 RTC chips.
-
-	  This driver can also be built as a module. If so, the module
-	  will be called rtc-rv3029c2.
-
-config RTC_DRV_RV3029_HWMON
-	bool "HWMON support for RV3029"
-	depends on RTC_DRV_RV3029C2 && HWMON
-	depends on !(RTC_DRV_RV3029C2=y && HWMON=m)
-	default y
-	help
-	  Say Y here if you want to expose temperature sensor data on
-	  rtc-rv3029.
-
 config RTC_DRV_RV8803
 	tristate "Micro Crystal RV8803"
 	help
@@ -634,6 +616,15 @@ config RTC_DRV_M41T94
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-m41t94.
 
+config RTC_DRV_DS1302
+	tristate "Dallas/Maxim DS1302"
+	depends on SPI
+	help
+	  If you say yes here you get support for the Dallas DS1302 RTC chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-ds1302.
+
 config RTC_DRV_DS1305
 	tristate "Dallas/Maxim DS1305/DS1306"
 	help
@@ -777,6 +768,25 @@ config RTC_DRV_PCF2127
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-pcf2127.
 
+config RTC_DRV_RV3029C2
+	tristate "Micro Crystal RV3029/3049"
+	depends on RTC_I2C_AND_SPI
+	help
+	  If you say yes here you get support for the Micro Crystal
+	  RV3029 and RV3049 RTC chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-rv3029c2.
+
+config RTC_DRV_RV3029_HWMON
+	bool "HWMON support for RV3029/3049"
+	depends on RTC_DRV_RV3029C2 && HWMON
+	depends on !(RTC_DRV_RV3029C2=y && HWMON=m)
+	default y
+	help
+	  Say Y here if you want to expose temperature sensor data on
+	  rtc-rv3029.
+
 comment "Platform RTC drivers"
 
 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
@@ -834,12 +844,6 @@ config RTC_DRV_DS1286
 	help
 	  If you say yes here you get support for the Dallas DS1286 RTC chips.
 
-config RTC_DRV_DS1302
-	tristate "Dallas DS1302"
-	depends on SH_SECUREEDGE5410
-	help
-	  If you say yes here you get support for the Dallas DS1302 RTC chips.
-
 config RTC_DRV_DS1511
 	tristate "Dallas DS1511"
 	depends on HAS_IOMEM

drivers/rtc/rtc-at91sam9.c

@@ -268,7 +268,7 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
 {
 	struct sam9_rtc *rtc = dev_get_drvdata(dev);
-	u32 mr = mr = rtt_readl(rtc, MR);
+	u32 mr = rtt_readl(rtc, MR);
 
 	seq_printf(seq, "update_IRQ\t: %s\n",
 			(mr & AT91_RTT_RTTINCIEN) ? "yes" : "no");

drivers/rtc/rtc-cmos.c

@@ -401,7 +401,7 @@ static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled)
 	return 0;
 }
 
-#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
+#if IS_ENABLED(CONFIG_RTC_INTF_PROC)
 
 static int cmos_procfs(struct device *dev, struct seq_file *seq)
 {

drivers/rtc/rtc-da9052.c

@@ -302,6 +302,13 @@ static int da9052_rtc_probe(struct platform_device *pdev)
 	if (ret != 0)
 		rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);
 
+	device_init_wakeup(&pdev->dev, true);
+	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+				       &da9052_rtc_ops, THIS_MODULE);
+
+	if (IS_ERR(rtc->rtc))
+		return PTR_ERR(rtc->rtc);
+
 	ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
 				da9052_rtc_irq, rtc);
 	if (ret != 0) {
@@ -309,11 +316,7 @@ static int da9052_rtc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	device_init_wakeup(&pdev->dev, true);
-
-	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
-				       &da9052_rtc_ops, THIS_MODULE);
-	return PTR_ERR_OR_ZERO(rtc->rtc);
+	return 0;
 }
 
 static struct platform_driver da9052_rtc_driver = {

drivers/rtc/rtc-ds1216.c

@@ -11,8 +11,6 @@
 #include <linux/bcd.h>
 #include <linux/slab.h>
 
-#define DRV_VERSION "0.2"
-
 struct ds1216_regs {
 	u8 tsec;
 	u8 sec;
@@ -176,5 +174,4 @@ module_platform_driver_probe(ds1216_rtc_platform_driver, ds1216_rtc_probe);
 MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
 MODULE_DESCRIPTION("DS1216 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("platform:rtc-ds1216");

drivers/rtc/rtc-ds1286.c

@@ -20,8 +20,6 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 
-#define DRV_VERSION		"1.0"
-
 struct ds1286_priv {
 	struct rtc_device *rtc;
 	u32 __iomem *rtcregs;
@@ -363,5 +361,4 @@ module_platform_driver(ds1286_platform_driver);
 MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
 MODULE_DESCRIPTION("DS1286 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("platform:rtc-ds1286");

drivers/rtc/rtc-ds1302.c

@@ -9,16 +9,16 @@
  * this archive for more details.
  */
 
+#include <linux/bcd.h>
 #include <linux/init.h>
-#include <linux/module.h>
+#include <linux/io.h>
 #include <linux/kernel.h>
-#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of.h>
 #include <linux/rtc.h>
-#include <linux/io.h>
-#include <linux/bcd.h>
+#include <linux/spi/spi.h>
 
 #define DRV_NAME	"rtc-ds1302"
-#define DRV_VERSION	"0.1.1"
 
 #define	RTC_CMD_READ	0x81		/* Read command */
 #define	RTC_CMD_WRITE	0x80		/* Write command */
@@ -28,6 +28,8 @@
 
 #define RTC_ADDR_RAM0	0x20		/* Address of RAM0 */
 #define RTC_ADDR_TCR	0x08		/* Address of trickle charge register */
+#define RTC_CLCK_BURST	0x1F		/* Address of clock burst */
+#define	RTC_CLCK_LEN	0x08		/* Size of clock burst */
 #define	RTC_ADDR_CTRL	0x07		/* Address of control register */
 #define	RTC_ADDR_YEAR	0x06		/* Address of year register */
 #define	RTC_ADDR_DAY	0x05		/* Address of day of week register */
@@ -37,219 +39,181 @@
 #define	RTC_ADDR_MIN	0x01		/* Address of minute register */
 #define	RTC_ADDR_SEC	0x00		/* Address of second register */
 
-#ifdef CONFIG_SH_SECUREEDGE5410
-#include <asm/rtc.h>
-#include <mach/secureedge5410.h>
-
-#define	RTC_RESET	0x1000
-#define	RTC_IODATA	0x0800
-#define	RTC_SCLK	0x0400
-
-#define set_dp(x)	SECUREEDGE_WRITE_IOPORT(x, 0x1c00)
-#define get_dp()	SECUREEDGE_READ_IOPORT()
-#define ds1302_set_tx()
-#define ds1302_set_rx()
-
-static inline int ds1302_hw_init(void)
+static int ds1302_rtc_set_time(struct device *dev, struct rtc_time *time)
 {
-	return 0;
+	struct spi_device	*spi = dev_get_drvdata(dev);
+	u8		buf[1 + RTC_CLCK_LEN];
+	u8		*bp = buf;
+	int		status;
+
+	/* Enable writing */
+	bp = buf;
+	*bp++ = RTC_ADDR_CTRL << 1 | RTC_CMD_WRITE;
+	*bp++ = RTC_CMD_WRITE_ENABLE;
+
+	status = spi_write_then_read(spi, buf, 2,
+			NULL, 0);
+	if (status)
+		return status;
+
+	/* Write registers starting at the first time/date address. */
+	bp = buf;
+	*bp++ = RTC_CLCK_BURST << 1 | RTC_CMD_WRITE;
+
+	*bp++ = bin2bcd(time->tm_sec);
+	*bp++ = bin2bcd(time->tm_min);
+	*bp++ = bin2bcd(time->tm_hour);
+	*bp++ = bin2bcd(time->tm_mday);
+	*bp++ = bin2bcd(time->tm_mon + 1);
+	*bp++ = time->tm_wday + 1;
+	*bp++ = bin2bcd(time->tm_year % 100);
+	*bp++ = RTC_CMD_WRITE_DISABLE;
+
+	/* use write-then-read since dma from stack is nonportable */
+	return spi_write_then_read(spi, buf, sizeof(buf),
+			NULL, 0);
 }
 
-static inline void ds1302_reset(void)
+static int ds1302_rtc_get_time(struct device *dev, struct rtc_time *time)
 {
-	set_dp(get_dp() & ~(RTC_RESET | RTC_IODATA | RTC_SCLK));
+	struct spi_device	*spi = dev_get_drvdata(dev);
+	u8		addr = RTC_CLCK_BURST << 1 | RTC_CMD_READ;
+	u8		buf[RTC_CLCK_LEN - 1];
+	int		status;
+
+	/* Use write-then-read to get all the date/time registers
+	 * since dma from stack is nonportable
+	 */
+	status = spi_write_then_read(spi, &addr, sizeof(addr),
+			buf, sizeof(buf));
+	if (status < 0)
+		return status;
+
+	/* Decode the registers */
+	time->tm_sec = bcd2bin(buf[RTC_ADDR_SEC]);
+	time->tm_min = bcd2bin(buf[RTC_ADDR_MIN]);
+	time->tm_hour = bcd2bin(buf[RTC_ADDR_HOUR]);
+	time->tm_wday = buf[RTC_ADDR_DAY] - 1;
+	time->tm_mday = bcd2bin(buf[RTC_ADDR_DATE]);
+	time->tm_mon = bcd2bin(buf[RTC_ADDR_MON]) - 1;
+	time->tm_year = bcd2bin(buf[RTC_ADDR_YEAR]) + 100;
+
+	/* Time may not be set */
+	return rtc_valid_tm(time);
 }
 
-static inline void ds1302_clock(void)
-{
-	set_dp(get_dp() | RTC_SCLK);	/* clock high */
-	set_dp(get_dp() & ~RTC_SCLK);	/* clock low */
-}
-
-static inline void ds1302_start(void)
-{
-	set_dp(get_dp() | RTC_RESET);
-}
-
-static inline void ds1302_stop(void)
-{
-	set_dp(get_dp() & ~RTC_RESET);
-}
-
-static inline void ds1302_txbit(int bit)
-{
-	set_dp((get_dp() & ~RTC_IODATA) | (bit ? RTC_IODATA : 0));
-}
-
-static inline int ds1302_rxbit(void)
-{
-	return !!(get_dp() & RTC_IODATA);
-}
-
-#else
-#error "Add support for your platform"
-#endif
+static struct rtc_class_ops ds1302_rtc_ops = {
+	.read_time	= ds1302_rtc_get_time,
+	.set_time	= ds1302_rtc_set_time,
+};
 
-static void ds1302_sendbits(unsigned int val)
+static int ds1302_probe(struct spi_device *spi)
 {
-	int i;
-
-	ds1302_set_tx();
-
-	for (i = 8; (i); i--, val >>= 1) {
-		ds1302_txbit(val & 0x1);
-		ds1302_clock();
+	struct rtc_device	*rtc;
+	u8		addr;
+	u8		buf[4];
+	u8		*bp = buf;
+	int		status;
+
+	/* Sanity check board setup data.  This may be hooked up
+	 * in 3wire mode, but we don't care.  Note that unless
+	 * there's an inverter in place, this needs SPI_CS_HIGH!
+	 */
+	if (spi->bits_per_word && (spi->bits_per_word != 8)) {
+		dev_err(&spi->dev, "bad word length\n");
+		return -EINVAL;
+	} else if (spi->max_speed_hz > 2000000) {
+		dev_err(&spi->dev, "speed is too high\n");
+		return -EINVAL;
+	} else if (spi->mode & SPI_CPHA) {
+		dev_err(&spi->dev, "bad mode\n");
+		return -EINVAL;
 	}
-}
-
-static unsigned int ds1302_recvbits(void)
-{
-	unsigned int val;
-	int i;
-
-	ds1302_set_rx();
 
-	for (i = 0, val = 0; (i < 8); i++) {
-		val |= (ds1302_rxbit() << i);
-		ds1302_clock();
+	addr = RTC_ADDR_CTRL << 1 | RTC_CMD_READ;
+	status = spi_write_then_read(spi, &addr, sizeof(addr), buf, 1);
+	if (status < 0) {
+		dev_err(&spi->dev, "control register read error %d\n",
+				status);
+		return status;
 	}
 
-	return val;
-}
-
-static unsigned int ds1302_readbyte(unsigned int addr)
-{
-	unsigned int val;
-
-	ds1302_reset();
-
-	ds1302_start();
-	ds1302_sendbits(((addr & 0x3f) << 1) | RTC_CMD_READ);
-	val = ds1302_recvbits();
-	ds1302_stop();
-
-	return val;
-}
-
-static void ds1302_writebyte(unsigned int addr, unsigned int val)
-{
-	ds1302_reset();
-
-	ds1302_start();
-	ds1302_sendbits(((addr & 0x3f) << 1) | RTC_CMD_WRITE);
-	ds1302_sendbits(val);
-	ds1302_stop();
-}
-
-static int ds1302_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
-	tm->tm_sec	= bcd2bin(ds1302_readbyte(RTC_ADDR_SEC));
-	tm->tm_min	= bcd2bin(ds1302_readbyte(RTC_ADDR_MIN));
-	tm->tm_hour	= bcd2bin(ds1302_readbyte(RTC_ADDR_HOUR));
-	tm->tm_wday	= bcd2bin(ds1302_readbyte(RTC_ADDR_DAY));
-	tm->tm_mday	= bcd2bin(ds1302_readbyte(RTC_ADDR_DATE));
-	tm->tm_mon	= bcd2bin(ds1302_readbyte(RTC_ADDR_MON)) - 1;
-	tm->tm_year	= bcd2bin(ds1302_readbyte(RTC_ADDR_YEAR));
-
-	if (tm->tm_year < 70)
-		tm->tm_year += 100;
-
-	dev_dbg(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 + 1, tm->tm_year, tm->tm_wday);
-
-	return rtc_valid_tm(tm);
-}
-
-static int ds1302_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
-	ds1302_writebyte(RTC_ADDR_CTRL, RTC_CMD_WRITE_ENABLE);
-	/* Stop RTC */
-	ds1302_writebyte(RTC_ADDR_SEC, ds1302_readbyte(RTC_ADDR_SEC) | 0x80);
-
-	ds1302_writebyte(RTC_ADDR_SEC, bin2bcd(tm->tm_sec));
-	ds1302_writebyte(RTC_ADDR_MIN, bin2bcd(tm->tm_min));
-	ds1302_writebyte(RTC_ADDR_HOUR, bin2bcd(tm->tm_hour));
-	ds1302_writebyte(RTC_ADDR_DAY, bin2bcd(tm->tm_wday));
-	ds1302_writebyte(RTC_ADDR_DATE, bin2bcd(tm->tm_mday));
-	ds1302_writebyte(RTC_ADDR_MON, bin2bcd(tm->tm_mon + 1));
-	ds1302_writebyte(RTC_ADDR_YEAR, bin2bcd(tm->tm_year % 100));
+	if ((buf[0] & ~RTC_CMD_WRITE_DISABLE) != 0) {
+		status = spi_write_then_read(spi, &addr, sizeof(addr), buf, 1);
+		if (status < 0) {
+			dev_err(&spi->dev, "control register read error %d\n",
+					status);
+			return status;
+		}
+
+		if ((buf[0] & ~RTC_CMD_WRITE_DISABLE) != 0) {
+			dev_err(&spi->dev, "junk in control register\n");
+			return -ENODEV;
+		}
+	}
+	if (buf[0] == 0) {
+		bp = buf;
+		*bp++ = RTC_ADDR_CTRL << 1 | RTC_CMD_WRITE;
+		*bp++ = RTC_CMD_WRITE_DISABLE;
+
+		status = spi_write_then_read(spi, buf, 2, NULL, 0);
+		if (status < 0) {
+			dev_err(&spi->dev, "control register write error %d\n",
+					status);
+			return status;
+		}
+
+		addr = RTC_ADDR_CTRL << 1 | RTC_CMD_READ;
+		status = spi_write_then_read(spi, &addr, sizeof(addr), buf, 1);
+		if (status < 0) {
+			dev_err(&spi->dev,
+					"error %d reading control register\n",
+					status);
+			return status;
+		}
+
+		if (buf[0] != RTC_CMD_WRITE_DISABLE) {
+			dev_err(&spi->dev, "failed to detect chip\n");
+			return -ENODEV;
+		}
+	}
 
-	/* Start RTC */
-	ds1302_writebyte(RTC_ADDR_SEC, ds1302_readbyte(RTC_ADDR_SEC) & ~0x80);
+	spi_set_drvdata(spi, spi);
 
-	ds1302_writebyte(RTC_ADDR_CTRL, RTC_CMD_WRITE_DISABLE);
+	rtc = devm_rtc_device_register(&spi->dev, "ds1302",
+			&ds1302_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc)) {
+		status = PTR_ERR(rtc);
+		dev_err(&spi->dev, "error %d registering rtc\n", status);
+		return status;
+	}
 
 	return 0;
 }
 
-static int ds1302_rtc_ioctl(struct device *dev, unsigned int cmd,
-			    unsigned long arg)
+static int ds1302_remove(struct spi_device *spi)
 {
-	switch (cmd) {
-#ifdef RTC_SET_CHARGE
-	case RTC_SET_CHARGE:
-	{
-		int tcs_val;
-
-		if (copy_from_user(&tcs_val, (int __user *)arg, sizeof(int)))
-			return -EFAULT;
-
-		ds1302_writebyte(RTC_ADDR_TCR, (0xa0 | tcs_val * 0xf));
-		return 0;
-	}
-#endif
-	}
-
-	return -ENOIOCTLCMD;
+	spi_set_drvdata(spi, NULL);
+	return 0;
 }
 
-static struct rtc_class_ops ds1302_rtc_ops = {
-	.read_time	= ds1302_rtc_read_time,
-	.set_time	= ds1302_rtc_set_time,
-	.ioctl		= ds1302_rtc_ioctl,
+#ifdef CONFIG_OF
+static const struct of_device_id ds1302_dt_ids[] = {
+	{ .compatible = "maxim,ds1302", },
+	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, ds1302_dt_ids);
+#endif
 
-static int __init ds1302_rtc_probe(struct platform_device *pdev)
-{
-	struct rtc_device *rtc;
-
-	if (ds1302_hw_init()) {
-		dev_err(&pdev->dev, "Failed to init communication channel");
-		return -EINVAL;
-	}
-
-	/* Reset */
-	ds1302_reset();
-
-	/* Write a magic value to the DS1302 RAM, and see if it sticks. */
-	ds1302_writebyte(RTC_ADDR_RAM0, 0x42);
-	if (ds1302_readbyte(RTC_ADDR_RAM0) != 0x42) {
-		dev_err(&pdev->dev, "Failed to probe");
-		return -ENODEV;
-	}
-
-	rtc = devm_rtc_device_register(&pdev->dev, "ds1302",
-					   &ds1302_rtc_ops, THIS_MODULE);
-	if (IS_ERR(rtc))
-		return PTR_ERR(rtc);
-
-	platform_set_drvdata(pdev, rtc);
-
-	return 0;
-}
-
-static struct platform_driver ds1302_platform_driver = {
-	.driver		= {
-		.name	= DRV_NAME,
-	},
+static struct spi_driver ds1302_driver = {
+	.driver.name	= "rtc-ds1302",
+	.driver.of_match_table = of_match_ptr(ds1302_dt_ids),
+	.probe		= ds1302_probe,
+	.remove		= ds1302_remove,
 };
 
-module_platform_driver_probe(ds1302_platform_driver, ds1302_rtc_probe);
+module_spi_driver(ds1302_driver);
 
 MODULE_DESCRIPTION("Dallas DS1302 RTC driver");
-MODULE_VERSION(DRV_VERSION);
 MODULE_AUTHOR("Paul Mundt, David McCullough");
 MODULE_LICENSE("GPL v2");

drivers/rtc/rtc-ds1307.c

@@ -275,9 +275,13 @@ static s32 ds1307_native_smbus_write_block_data(const struct i2c_client *client,
 {
 	u8 suboffset = 0;
 
-	if (length <= I2C_SMBUS_BLOCK_MAX)
-		return i2c_smbus_write_i2c_block_data(client,
+	if (length <= I2C_SMBUS_BLOCK_MAX) {
+		s32 retval = i2c_smbus_write_i2c_block_data(client,
 					command, length, values);
+		if (retval < 0)
+			return retval;
+		return length;
+	}
 
 	while (suboffset < length) {
 		s32 retval = i2c_smbus_write_i2c_block_data(client,
@@ -538,12 +542,8 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	buf[5] = 0;
 	buf[6] = 0;
 
-	/* optionally enable ALARM1 */
+	/* disable alarms */
 	buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
-	if (t->enabled) {
-		dev_dbg(dev, "alarm IRQ armed\n");
-		buf[7] |= DS1337_BIT_A1IE;	/* only ALARM1 is used */
-	}
 	buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
 
 	ret = ds1307->write_block_data(client,
@@ -553,6 +553,13 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		return ret;
 	}
 
+	/* optionally enable ALARM1 */
+	if (t->enabled) {
+		dev_dbg(dev, "alarm IRQ armed\n");
+		buf[7] |= DS1337_BIT_A1IE;	/* only ALARM1 is used */
+		i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, buf[7]);
+	}
+
 	return 0;
 }
 
@@ -1144,12 +1151,10 @@ static struct clk_init_data ds3231_clks_init[] = {
 	[DS3231_CLK_SQW] = {
 		.name = "ds3231_clk_sqw",
 		.ops = &ds3231_clk_sqw_ops,
-		.flags = CLK_IS_ROOT,
 	},
 	[DS3231_CLK_32KHZ] = {
 		.name = "ds3231_clk_32khz",
 		.ops = &ds3231_clk_32khz_ops,
-		.flags = CLK_IS_ROOT,
 	},
 };
 

drivers/rtc/rtc-ds1343.c

@@ -24,7 +24,6 @@
 #include <linux/pm_wakeirq.h>
 #include <linux/slab.h>
 
-#define DS1343_DRV_VERSION	"01.00"
 #define DALLAS_MAXIM_DS1343	0
 #define DALLAS_MAXIM_DS1344	1
 
@@ -747,4 +746,3 @@ MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
 MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>,"
 		"Ankur Srivastava <sankurece@gmail.com>");
 MODULE_LICENSE("GPL v2");
-MODULE_VERSION(DS1343_DRV_VERSION);

drivers/rtc/rtc-ds1511.c

@@ -25,8 +25,6 @@
 #include <linux/io.h>
 #include <linux/module.h>
 
-#define DRV_VERSION "0.6"
-
 enum ds1511reg {
 	DS1511_SEC = 0x0,
 	DS1511_MIN = 0x1,
@@ -537,4 +535,3 @@ module_platform_driver(ds1511_rtc_driver);
 MODULE_AUTHOR("Andrew Sharp <andy.sharp@lsi.com>");
 MODULE_DESCRIPTION("Dallas DS1511 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-ds1553.c

@@ -20,8 +20,6 @@
 #include <linux/io.h>
 #include <linux/module.h>
 
-#define DRV_VERSION "0.3"
-
 #define RTC_REG_SIZE		0x2000
 #define RTC_OFFSET		0x1ff0
 
@@ -359,4 +357,3 @@ module_platform_driver(ds1553_rtc_driver);
 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 MODULE_DESCRIPTION("Dallas DS1553 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-ds1672.c

@@ -13,8 +13,6 @@
 #include <linux/rtc.h>
 #include <linux/module.h>
 
-#define DRV_VERSION "0.4"
-
 /* Registers */
 
 #define DS1672_REG_CNT_BASE	0
@@ -165,8 +163,6 @@ static int ds1672_probe(struct i2c_client *client,
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		return -ENODEV;
 
-	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
-
 	rtc = devm_rtc_device_register(&client->dev, ds1672_driver.driver.name,
 				  &ds1672_rtc_ops, THIS_MODULE);
 
@@ -213,4 +209,3 @@ module_i2c_driver(ds1672_driver);
 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 MODULE_DESCRIPTION("Dallas/Maxim DS1672 timekeeper driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-ds1685.c

@@ -32,8 +32,6 @@
 #include <linux/proc_fs.h>
 #endif
 
-#define DRV_VERSION	"0.42.0"
-
 
 /* ----------------------------------------------------------------------- */
 /* Standard read/write functions if platform does not provide overrides */
@@ -2213,6 +2211,7 @@ ds1685_rtc_poweroff(struct platform_device *pdev)
 			   (ctrl4a | RTC_CTRL_4A_PAB));
 
 		/* Spin ... we do not switch back to bank0. */
+		while(1);
 		unreachable();
 	}
 }
@@ -2224,5 +2223,4 @@ MODULE_AUTHOR("Joshua Kinard <kumba@gentoo.org>");
 MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd-electronics.com>");
 MODULE_DESCRIPTION("Dallas/Maxim DS1685/DS1687-series RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("platform:rtc-ds1685");

drivers/rtc/rtc-ds1742.c

@@ -24,8 +24,6 @@
 #include <linux/io.h>
 #include <linux/module.h>
 
-#define DRV_VERSION "0.4"
-
 #define RTC_SIZE		8
 
 #define RTC_CONTROL		0
@@ -239,5 +237,4 @@ module_platform_driver(ds1742_rtc_driver);
 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 MODULE_DESCRIPTION("Dallas DS1742 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("platform:rtc-ds1742");

drivers/rtc/rtc-ds3232.c

@@ -369,6 +369,11 @@ static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
 	if (ret)
 		return ret;
 
+	ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops,
+						THIS_MODULE);
+	if (IS_ERR(ds3232->rtc))
+		return PTR_ERR(ds3232->rtc);
+
 	if (ds3232->irq > 0) {
 		ret = devm_request_threaded_irq(dev, ds3232->irq, NULL,
 						ds3232_irq,
@@ -380,10 +385,8 @@ static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
 		} else
 			device_init_wakeup(dev, 1);
 	}
-	ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops,
-						THIS_MODULE);
 
-	return PTR_ERR_OR_ZERO(ds3232->rtc);
+	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/rtc/rtc-ep93xx.c

@@ -28,8 +28,6 @@
 #define  EP93XX_RTC_SWCOMP_INT_MASK	 0x0000ffff
 #define  EP93XX_RTC_SWCOMP_INT_SHIFT	 0
 
-#define DRV_VERSION "0.3"
-
 /*
  * struct device dev.platform_data is used to store our private data
  * because struct rtc_device does not have a variable to hold it.
@@ -184,5 +182,4 @@ module_platform_driver(ep93xx_rtc_driver);
 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 MODULE_DESCRIPTION("EP93XX RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("platform:ep93xx-rtc");

drivers/rtc/rtc-gemini.c

@@ -28,7 +28,6 @@
 #include <linux/module.h>
 
 #define DRV_NAME        "rtc-gemini"
-#define DRV_VERSION     "0.2"
 
 MODULE_AUTHOR("Hans Ulli Kroll <ulli.kroll@googlemail.com>");
 MODULE_DESCRIPTION("RTC driver for Gemini SoC");

drivers/rtc/rtc-hym8563.c

@@ -413,7 +413,7 @@ static struct clk *hym8563_clkout_register_clk(struct hym8563 *hym8563)
 
 	init.name = "hym8563-clkout";
 	init.ops = &hym8563_clkout_ops;
-	init.flags = CLK_IS_ROOT;
+	init.flags = 0;
 	init.parent_names = NULL;
 	init.num_parents = 0;
 	hym8563->clkout_hw.init = &init;

drivers/rtc/rtc-isl12022.c

@@ -20,8 +20,6 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 
-#define DRV_VERSION "0.1"
-
 /* ISL register offsets */
 #define ISL12022_REG_SC		0x00
 #define ISL12022_REG_MN		0x01
@@ -258,8 +256,6 @@ static int isl12022_probe(struct i2c_client *client,
 	if (!isl12022)
 		return -ENOMEM;
 
-	dev_dbg(&client->dev, "chip found, driver version " DRV_VERSION "\n");
-
 	i2c_set_clientdata(client, isl12022);
 
 	isl12022->rtc = devm_rtc_device_register(&client->dev,
@@ -299,4 +295,3 @@ module_i2c_driver(isl12022_driver);
 MODULE_AUTHOR("roman.fietze@telemotive.de");
 MODULE_DESCRIPTION("ISL 12022 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-isl1208.c

@@ -15,8 +15,6 @@
 #include <linux/bcd.h>
 #include <linux/rtc.h>
 
-#define DRV_VERSION "0.3"
-
 /* Register map */
 /* rtc section */
 #define ISL1208_REG_SC  0x00
@@ -632,9 +630,6 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (isl1208_i2c_validate_client(client) < 0)
 		return -ENODEV;
 
-	dev_info(&client->dev,
-		 "chip found, driver version " DRV_VERSION "\n");
-
 	if (client->irq > 0) {
 		rc = devm_request_threaded_irq(&client->dev, client->irq, NULL,
 					       isl1208_rtc_interrupt,
@@ -706,4 +701,3 @@ module_i2c_driver(isl1208_driver);
 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-m41t80.c

@@ -32,41 +32,42 @@
 #include <linux/watchdog.h>
 #endif
 
-#define M41T80_REG_SSEC	0
-#define M41T80_REG_SEC	1
-#define M41T80_REG_MIN	2
-#define M41T80_REG_HOUR	3
-#define M41T80_REG_WDAY	4
-#define M41T80_REG_DAY	5
-#define M41T80_REG_MON	6
-#define M41T80_REG_YEAR	7
-#define M41T80_REG_ALARM_MON	0xa
-#define M41T80_REG_ALARM_DAY	0xb
-#define M41T80_REG_ALARM_HOUR	0xc
-#define M41T80_REG_ALARM_MIN	0xd
-#define M41T80_REG_ALARM_SEC	0xe
-#define M41T80_REG_FLAGS	0xf
-#define M41T80_REG_SQW	0x13
+#define M41T80_REG_SSEC		0x00
+#define M41T80_REG_SEC		0x01
+#define M41T80_REG_MIN		0x02
+#define M41T80_REG_HOUR		0x03
+#define M41T80_REG_WDAY		0x04
+#define M41T80_REG_DAY		0x05
+#define M41T80_REG_MON		0x06
+#define M41T80_REG_YEAR		0x07
+#define M41T80_REG_ALARM_MON	0x0a
+#define M41T80_REG_ALARM_DAY	0x0b
+#define M41T80_REG_ALARM_HOUR	0x0c
+#define M41T80_REG_ALARM_MIN	0x0d
+#define M41T80_REG_ALARM_SEC	0x0e
+#define M41T80_REG_FLAGS	0x0f
+#define M41T80_REG_SQW		0x13
 
 #define M41T80_DATETIME_REG_SIZE	(M41T80_REG_YEAR + 1)
 #define M41T80_ALARM_REG_SIZE	\
 	(M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON)
 
-#define M41T80_SEC_ST		(1 << 7)	/* ST: Stop Bit */
-#define M41T80_ALMON_AFE	(1 << 7)	/* AFE: AF Enable Bit */
-#define M41T80_ALMON_SQWE	(1 << 6)	/* SQWE: SQW Enable Bit */
-#define M41T80_ALHOUR_HT	(1 << 6)	/* HT: Halt Update Bit */
-#define M41T80_FLAGS_AF		(1 << 6)	/* AF: Alarm Flag Bit */
-#define M41T80_FLAGS_BATT_LOW	(1 << 4)	/* BL: Battery Low Bit */
-#define M41T80_WATCHDOG_RB2	(1 << 7)	/* RB: Watchdog resolution */
-#define M41T80_WATCHDOG_RB1	(1 << 1)	/* RB: Watchdog resolution */
-#define M41T80_WATCHDOG_RB0	(1 << 0)	/* RB: Watchdog resolution */
-
-#define M41T80_FEATURE_HT	(1 << 0)	/* Halt feature */
-#define M41T80_FEATURE_BL	(1 << 1)	/* Battery low indicator */
-#define M41T80_FEATURE_SQ	(1 << 2)	/* Squarewave feature */
-#define M41T80_FEATURE_WD	(1 << 3)	/* Extra watchdog resolution */
-#define M41T80_FEATURE_SQ_ALT	(1 << 4)	/* RSx bits are in reg 4 */
+#define M41T80_SEC_ST		BIT(7)	/* ST: Stop Bit */
+#define M41T80_ALMON_AFE	BIT(7)	/* AFE: AF Enable Bit */
+#define M41T80_ALMON_SQWE	BIT(6)	/* SQWE: SQW Enable Bit */
+#define M41T80_ALHOUR_HT	BIT(6)	/* HT: Halt Update Bit */
+#define M41T80_FLAGS_OF		BIT(2)	/* OF: Oscillator Failure Bit */
+#define M41T80_FLAGS_AF		BIT(6)	/* AF: Alarm Flag Bit */
+#define M41T80_FLAGS_BATT_LOW	BIT(4)	/* BL: Battery Low Bit */
+#define M41T80_WATCHDOG_RB2	BIT(7)	/* RB: Watchdog resolution */
+#define M41T80_WATCHDOG_RB1	BIT(1)	/* RB: Watchdog resolution */
+#define M41T80_WATCHDOG_RB0	BIT(0)	/* RB: Watchdog resolution */
+
+#define M41T80_FEATURE_HT	BIT(0)	/* Halt feature */
+#define M41T80_FEATURE_BL	BIT(1)	/* Battery low indicator */
+#define M41T80_FEATURE_SQ	BIT(2)	/* Squarewave feature */
+#define M41T80_FEATURE_WD	BIT(3)	/* Extra watchdog resolution */
+#define M41T80_FEATURE_SQ_ALT	BIT(4)	/* RSx bits are in reg 4 */
 
 static DEFINE_MUTEX(m41t80_rtc_mutex);
 static const struct i2c_device_id m41t80_id[] = {
@@ -90,27 +91,65 @@ struct m41t80_data {
 	struct rtc_device *rtc;
 };
 
+static irqreturn_t m41t80_handle_irq(int irq, void *dev_id)
+{
+	struct i2c_client *client = dev_id;
+	struct m41t80_data *m41t80 = i2c_get_clientdata(client);
+	struct mutex *lock = &m41t80->rtc->ops_lock;
+	unsigned long events = 0;
+	int flags, flags_afe;
+
+	mutex_lock(lock);
+
+	flags_afe = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
+	if (flags_afe < 0) {
+		mutex_unlock(lock);
+		return IRQ_NONE;
+	}
+
+	flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
+	if (flags <= 0) {
+		mutex_unlock(lock);
+		return IRQ_NONE;
+	}
+
+	if (flags & M41T80_FLAGS_AF) {
+		flags &= ~M41T80_FLAGS_AF;
+		flags_afe &= ~M41T80_ALMON_AFE;
+		events |= RTC_AF;
+	}
+
+	if (events) {
+		rtc_update_irq(m41t80->rtc, 1, events);
+		i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS, flags);
+		i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
+					  flags_afe);
+	}
+
+	mutex_unlock(lock);
+
+	return IRQ_HANDLED;
+}
+
 static int m41t80_get_datetime(struct i2c_client *client,
 			       struct rtc_time *tm)
 {
-	u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC };
-	struct i2c_msg msgs[] = {
-		{
-			.addr	= client->addr,
-			.flags	= 0,
-			.len	= 1,
-			.buf	= dt_addr,
-		},
-		{
-			.addr	= client->addr,
-			.flags	= I2C_M_RD,
-			.len	= M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC,
-			.buf	= buf + M41T80_REG_SEC,
-		},
-	};
+	unsigned char buf[8];
+	int err, flags;
+
+	flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
+	if (flags < 0)
+		return flags;
 
-	if (i2c_transfer(client->adapter, msgs, 2) < 0) {
-		dev_err(&client->dev, "read error\n");
+	if (flags & M41T80_FLAGS_OF) {
+		dev_err(&client->dev, "Oscillator failure, data is invalid.\n");
+		return -EINVAL;
+	}
+
+	err = i2c_smbus_read_i2c_block_data(client, M41T80_REG_SSEC,
+					    sizeof(buf), buf);
+	if (err < 0) {
+		dev_err(&client->dev, "Unable to read date\n");
 		return -EIO;
 	}
 
@@ -129,70 +168,42 @@ static int m41t80_get_datetime(struct i2c_client *client,
 /* Sets the given date and time to the real time clock. */
 static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 {
-	u8 wbuf[1 + M41T80_DATETIME_REG_SIZE];
-	u8 *buf = &wbuf[1];
-	u8 dt_addr[1] = { M41T80_REG_SEC };
-	struct i2c_msg msgs_in[] = {
-		{
-			.addr	= client->addr,
-			.flags	= 0,
-			.len	= 1,
-			.buf	= dt_addr,
-		},
-		{
-			.addr	= client->addr,
-			.flags	= I2C_M_RD,
-			.len	= M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC,
-			.buf	= buf + M41T80_REG_SEC,
-		},
-	};
-	struct i2c_msg msgs[] = {
-		{
-			.addr	= client->addr,
-			.flags	= 0,
-			.len	= 1 + M41T80_DATETIME_REG_SIZE,
-			.buf	= wbuf,
-		 },
-	};
+	unsigned char buf[8];
+	int err, flags;
 
-	/* Read current reg values into buf[1..7] */
-	if (i2c_transfer(client->adapter, msgs_in, 2) < 0) {
-		dev_err(&client->dev, "read error\n");
-		return -EIO;
-	}
+	if (tm->tm_year < 100 || tm->tm_year > 199)
+		return -EINVAL;
 
-	wbuf[0] = 0; /* offset into rtc's regs */
-	/* Merge time-data and register flags into buf[0..7] */
 	buf[M41T80_REG_SSEC] = 0;
-	buf[M41T80_REG_SEC] =
-		bin2bcd(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f);
-	buf[M41T80_REG_MIN] =
-		bin2bcd(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f);
-	buf[M41T80_REG_HOUR] =
-		bin2bcd(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f);
-	buf[M41T80_REG_WDAY] =
-		(tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07);
-	buf[M41T80_REG_DAY] =
-		bin2bcd(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f);
-	buf[M41T80_REG_MON] =
-		bin2bcd(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f);
-
-	/* assume 20YY not 19YY */
-	if (tm->tm_year < 100 || tm->tm_year > 199) {
-		dev_err(&client->dev, "Year must be between 2000 and 2099. It's %d.\n",
-			tm->tm_year + 1900);
-		return -EINVAL;
+	buf[M41T80_REG_SEC] = bin2bcd(tm->tm_sec);
+	buf[M41T80_REG_MIN] = bin2bcd(tm->tm_min);
+	buf[M41T80_REG_HOUR] = bin2bcd(tm->tm_hour);
+	buf[M41T80_REG_DAY] = bin2bcd(tm->tm_mday);
+	buf[M41T80_REG_MON] = bin2bcd(tm->tm_mon + 1);
+	buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year - 100);
+	buf[M41T80_REG_WDAY] = tm->tm_wday;
+
+	err = i2c_smbus_write_i2c_block_data(client, M41T80_REG_SSEC,
+					     sizeof(buf), buf);
+	if (err < 0) {
+		dev_err(&client->dev, "Unable to write to date registers\n");
+		return err;
 	}
-	buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100);
 
-	if (i2c_transfer(client->adapter, msgs, 1) != 1) {
-		dev_err(&client->dev, "write error\n");
+	/* Clear the OF bit of Flags Register */
+	flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
+	if (flags < 0)
+		return flags;
+
+	if (i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
+				      flags & ~M41T80_FLAGS_OF)) {
+		dev_err(&client->dev, "Unable to write flags register\n");
 		return -EIO;
 	}
-	return 0;
+
+	return err;
 }
 
-#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
 static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq)
 {
 	struct i2c_client *client = to_i2c_client(dev);
@@ -206,9 +217,6 @@ static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq)
 	}
 	return 0;
 }
-#else
-#define m41t80_rtc_proc NULL
-#endif
 
 static int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
@@ -220,19 +228,117 @@ static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	return m41t80_set_datetime(to_i2c_client(dev), tm);
 }
 
-/*
- * XXX - m41t80 alarm functionality is reported broken.
- * until it is fixed, don't register alarm functions.
- */
+static int m41t80_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int flags, retval;
+
+	flags = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
+	if (flags < 0)
+		return flags;
+
+	if (enabled)
+		flags |= M41T80_ALMON_AFE;
+	else
+		flags &= ~M41T80_ALMON_AFE;
+
+	retval = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, flags);
+	if (retval < 0) {
+		dev_info(dev, "Unable to enable alarm IRQ %d\n", retval);
+		return retval;
+	}
+	return 0;
+}
+
+static int m41t80_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	u8 alarmvals[5];
+	int ret, err;
+
+	alarmvals[0] = bin2bcd(alrm->time.tm_mon + 1);
+	alarmvals[1] = bin2bcd(alrm->time.tm_mday);
+	alarmvals[2] = bin2bcd(alrm->time.tm_hour);
+	alarmvals[3] = bin2bcd(alrm->time.tm_min);
+	alarmvals[4] = bin2bcd(alrm->time.tm_sec);
+
+	/* Clear AF and AFE flags */
+	ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
+	if (ret < 0)
+		return ret;
+	err = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
+					ret & ~(M41T80_ALMON_AFE));
+	if (err < 0) {
+		dev_err(dev, "Unable to clear AFE bit\n");
+		return err;
+	}
+
+	ret = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
+	if (ret < 0)
+		return ret;
+
+	err = i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
+					ret & ~(M41T80_FLAGS_AF));
+	if (err < 0) {
+		dev_err(dev, "Unable to clear AF bit\n");
+		return err;
+	}
+
+	/* Write the alarm */
+	err = i2c_smbus_write_i2c_block_data(client, M41T80_REG_ALARM_MON,
+					     5, alarmvals);
+	if (err)
+		return err;
+
+	/* Enable the alarm interrupt */
+	if (alrm->enabled) {
+		alarmvals[0] |= M41T80_ALMON_AFE;
+		err = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
+						alarmvals[0]);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int m41t80_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	u8 alarmvals[5];
+	int flags, ret;
+
+	ret = i2c_smbus_read_i2c_block_data(client, M41T80_REG_ALARM_MON,
+					    5, alarmvals);
+	if (ret != 5)
+		return ret < 0 ? ret : -EIO;
+
+	flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
+	if (flags < 0)
+		return flags;
+
+	alrm->time.tm_sec  = bcd2bin(alarmvals[4] & 0x7f);
+	alrm->time.tm_min  = bcd2bin(alarmvals[3] & 0x7f);
+	alrm->time.tm_hour = bcd2bin(alarmvals[2] & 0x3f);
+	alrm->time.tm_wday = -1;
+	alrm->time.tm_mday = bcd2bin(alarmvals[1] & 0x3f);
+	alrm->time.tm_mon  = bcd2bin(alarmvals[0] & 0x3f);
+	alrm->time.tm_year = -1;
+
+	alrm->enabled = !!(alarmvals[0] & M41T80_ALMON_AFE);
+	alrm->pending = (flags & M41T80_FLAGS_AF) && alrm->enabled;
+
+	return 0;
+}
+
 static struct rtc_class_ops m41t80_rtc_ops = {
 	.read_time = m41t80_rtc_read_time,
 	.set_time = m41t80_rtc_set_time,
 	.proc = m41t80_rtc_proc,
 };
 
-#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
-static ssize_t m41t80_sysfs_show_flags(struct device *dev,
-				struct device_attribute *attr, char *buf)
+static ssize_t flags_show(struct device *dev,
+			  struct device_attribute *attr, char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	int val;
@@ -242,10 +348,10 @@ static ssize_t m41t80_sysfs_show_flags(struct device *dev,
 		return val;
 	return sprintf(buf, "%#x\n", val);
 }
-static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL);
+static DEVICE_ATTR_RO(flags);
 
-static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev,
-				struct device_attribute *attr, char *buf)
+static ssize_t sqwfreq_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct m41t80_data *clientdata = i2c_get_clientdata(client);
@@ -272,14 +378,19 @@ static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev,
 	}
 	return sprintf(buf, "%d\n", val);
 }
-static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
-				struct device_attribute *attr,
-				const char *buf, size_t count)
+
+static ssize_t sqwfreq_store(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t count)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct m41t80_data *clientdata = i2c_get_clientdata(client);
 	int almon, sqw, reg_sqw, rc;
-	int val = simple_strtoul(buf, NULL, 0);
+	unsigned long val;
+
+	rc = kstrtoul(buf, 0, &val);
+	if (rc < 0)
+		return rc;
 
 	if (!(clientdata->features & M41T80_FEATURE_SQ))
 		return -EINVAL;
@@ -308,7 +419,7 @@ static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
 	sqw = (sqw & 0x0f) | (val << 4);
 
 	rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
-				      almon & ~M41T80_ALMON_SQWE);
+				       almon & ~M41T80_ALMON_SQWE);
 	if (rc < 0)
 		return rc;
 
@@ -318,35 +429,24 @@ static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
 			return rc;
 
 		rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
-					     almon | M41T80_ALMON_SQWE);
-		if (rc <0)
+					       almon | M41T80_ALMON_SQWE);
+		if (rc < 0)
 			return rc;
 	}
 	return count;
 }
-static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR,
-		   m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq);
+static DEVICE_ATTR_RW(sqwfreq);
 
 static struct attribute *attrs[] = {
 	&dev_attr_flags.attr,
 	&dev_attr_sqwfreq.attr,
 	NULL,
 };
+
 static struct attribute_group attr_group = {
 	.attrs = attrs,
 };
 
-static int m41t80_sysfs_register(struct device *dev)
-{
-	return sysfs_create_group(&dev->kobj, &attr_group);
-}
-#else
-static int m41t80_sysfs_register(struct device *dev)
-{
-	return 0;
-}
-#endif
-
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
 /*
  *****************************************************************************
@@ -394,7 +494,7 @@ static void wdt_ping(void)
 		/*
 		 * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02)
 		 */
-		i2c_data[1] = wdt_margin<<2 | 0x82;
+		i2c_data[1] = wdt_margin << 2 | 0x82;
 
 	/*
 	 * M41T65 has three bits for watchdog resolution.  Don't set bit 7, as
@@ -636,49 +736,76 @@ 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)
 {
+	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 	int rc = 0;
 	struct rtc_device *rtc = NULL;
 	struct rtc_time tm;
-	struct m41t80_data *clientdata = NULL;
+	struct m41t80_data *m41t80_data = NULL;
 
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C
-				     | I2C_FUNC_SMBUS_BYTE_DATA))
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
+				     I2C_FUNC_SMBUS_BYTE_DATA)) {
+		dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n");
 		return -ENODEV;
+	}
 
-	clientdata = devm_kzalloc(&client->dev, sizeof(*clientdata),
-				GFP_KERNEL);
-	if (!clientdata)
+	m41t80_data = devm_kzalloc(&client->dev, sizeof(*m41t80_data),
+				   GFP_KERNEL);
+	if (!m41t80_data)
 		return -ENOMEM;
 
-	clientdata->features = id->driver_data;
-	i2c_set_clientdata(client, clientdata);
+	m41t80_data->features = id->driver_data;
+	i2c_set_clientdata(client, m41t80_data);
+
+	if (client->irq > 0) {
+		rc = devm_request_threaded_irq(&client->dev, client->irq,
+					       NULL, m41t80_handle_irq,
+					       IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+					       "m41t80", 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);
+		}
+	}
 
 	rtc = devm_rtc_device_register(&client->dev, client->name,
-					&m41t80_rtc_ops, THIS_MODULE);
+				       &m41t80_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
 
-	clientdata->rtc = rtc;
+	m41t80_data->rtc = rtc;
 
 	/* Make sure HT (Halt Update) bit is cleared */
 	rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR);
 
 	if (rc >= 0 && rc & M41T80_ALHOUR_HT) {
-		if (clientdata->features & M41T80_FEATURE_HT) {
+		if (m41t80_data->features & M41T80_FEATURE_HT) {
 			m41t80_get_datetime(client, &tm);
 			dev_info(&client->dev, "HT bit was set!\n");
 			dev_info(&client->dev,
-				 "Power Down at "
-				 "%04i-%02i-%02i %02i:%02i:%02i\n",
+				 "Power Down at %04i-%02i-%02i %02i:%02i:%02i\n",
 				 tm.tm_year + 1900,
 				 tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
 				 tm.tm_min, tm.tm_sec);
 		}
 		rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_HOUR,
-					      rc & ~M41T80_ALHOUR_HT);
+					       rc & ~M41T80_ALHOUR_HT);
 	}
 
 	if (rc < 0) {
@@ -691,18 +818,30 @@ static int m41t80_probe(struct i2c_client *client,
 
 	if (rc >= 0 && rc & M41T80_SEC_ST)
 		rc = i2c_smbus_write_byte_data(client, M41T80_REG_SEC,
-					      rc & ~M41T80_SEC_ST);
+					       rc & ~M41T80_SEC_ST);
 	if (rc < 0) {
 		dev_err(&client->dev, "Can't clear ST bit\n");
 		return rc;
 	}
 
-	rc = m41t80_sysfs_register(&client->dev);
-	if (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(&client->dev, m41t80_remove_sysfs_group,
+			     &client->dev);
+	if (rc) {
+		m41t80_remove_sysfs_group(&client->dev);
+		dev_err(&client->dev,
+			"Failed to add sysfs cleanup action: %d\n", rc);
 		return rc;
+	}
 
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
-	if (clientdata->features & M41T80_FEATURE_HT) {
+	if (m41t80_data->features & M41T80_FEATURE_HT) {
 		save_client = client;
 		rc = misc_register(&wdt_dev);
 		if (rc)

drivers/rtc/rtc-m48t35.c

@@ -22,8 +22,6 @@
 #include <linux/io.h>
 #include <linux/err.h>
 
-#define DRV_VERSION		"1.0"
-
 struct m48t35_rtc {
 	u8	pad[0x7ff8];    /* starts at 0x7ff8 */
 	u8	control;
@@ -190,5 +188,4 @@ module_platform_driver(m48t35_platform_driver);
 MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
 MODULE_DESCRIPTION("M48T35 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("platform:rtc-m48t35");

drivers/rtc/rtc-m48t86.c

@@ -39,9 +39,6 @@
 #define M48T86_REG_B_SET	(1 << 7)
 #define M48T86_REG_D_VRT	(1 << 7)
 
-#define DRV_VERSION "0.1"
-
-
 static int m48t86_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	unsigned char reg;
@@ -178,5 +175,4 @@ module_platform_driver(m48t86_rtc_platform_driver);
 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 MODULE_DESCRIPTION("M48T86 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("platform:rtc-m48t86");

drivers/rtc/rtc-max6900.c

@@ -17,8 +17,6 @@
 #include <linux/rtc.h>
 #include <linux/delay.h>
 
-#define DRV_VERSION "0.2"
-
 /*
  * register indices
  */
@@ -218,8 +216,6 @@ max6900_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		return -ENODEV;
 
-	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
-
 	rtc = devm_rtc_device_register(&client->dev, max6900_driver.driver.name,
 					&max6900_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc))
@@ -249,4 +245,3 @@ module_i2c_driver(max6900_driver);
 MODULE_DESCRIPTION("Maxim MAX6900 RTC driver");
 MODULE_AUTHOR("Dale Farnsworth <dale@farnsworth.org>");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-mc13xxx.c

@@ -250,18 +250,6 @@ static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev)
-{
-	struct mc13xxx_rtc *priv = dev;
-	struct mc13xxx *mc13xxx = priv->mc13xxx;
-
-	rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);
-
-	mc13xxx_irq_ack(mc13xxx, irq);
-
-	return IRQ_HANDLED;
-}
-
 static const struct rtc_class_ops mc13xxx_rtc_ops = {
 	.read_time = mc13xxx_rtc_read_time,
 	.set_mmss64 = mc13xxx_rtc_set_mmss,
@@ -307,11 +295,6 @@ static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_irq_request;
 
-	ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_1HZ,
-			mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
-	if (ret)
-		goto err_irq_request;
-
 	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA,
 			mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv);
 	if (ret)
@@ -326,7 +309,6 @@ static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
 
 err_irq_request:
 	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
-	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
 	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
 
 	mc13xxx_unlock(mc13xxx);
@@ -341,7 +323,6 @@ static int mc13xxx_rtc_remove(struct platform_device *pdev)
 	mc13xxx_lock(priv->mc13xxx);
 
 	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv);
-	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv);
 	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv);
 
 	mc13xxx_unlock(priv->mc13xxx);

drivers/rtc/rtc-mrst.c

@@ -266,7 +266,7 @@ static int mrst_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 }
 
 
-#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
+#if IS_ENABLED(CONFIG_RTC_INTF_PROC)
 
 static int mrst_procfs(struct device *dev, struct seq_file *seq)
 {

drivers/rtc/rtc-mxc.c

@@ -240,9 +240,6 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
 		mxc_rtc_irq_enable(&pdev->dev, RTC_ALM_BIT, 0);
 	}
 
-	if (status & RTC_1HZ_BIT)
-		events |= (RTC_UF | RTC_IRQF);
-
 	if (status & PIT_ALL_ON)
 		events |= (RTC_PF | RTC_IRQF);
 

drivers/rtc/rtc-pcf2123.c

@@ -46,8 +46,6 @@
 #include <linux/module.h>
 #include <linux/sysfs.h>
 
-#define DRV_VERSION "0.6"
-
 /* REGISTERS */
 #define PCF2123_REG_CTRL1	(0x00)	/* Control Register 1 */
 #define PCF2123_REG_CTRL2	(0x01)	/* Control Register 2 */
@@ -395,7 +393,6 @@ static int pcf2123_probe(struct spi_device *spi)
 		}
 	}
 
-	dev_info(&spi->dev, "chip found, driver version " DRV_VERSION "\n");
 	dev_info(&spi->dev, "spiclk %u KHz.\n",
 			(spi->max_speed_hz + 500) / 1000);
 
@@ -474,4 +471,3 @@ module_spi_driver(pcf2123_driver);
 MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>");
 MODULE_DESCRIPTION("NXP PCF2123 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-pcf8563.c

@@ -23,8 +23,6 @@
 #include <linux/of.h>
 #include <linux/err.h>
 
-#define DRV_VERSION "0.4.4"
-
 #define PCF8563_REG_ST1		0x00 /* status */
 #define PCF8563_REG_ST2		0x01
 #define PCF8563_BIT_AIE		(1 << 1)
@@ -535,7 +533,7 @@ static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
 
 	init.name = "pcf8563-clkout";
 	init.ops = &pcf8563_clkout_ops;
-	init.flags = CLK_IS_ROOT;
+	init.flags = 0;
 	init.parent_names = NULL;
 	init.num_parents = 0;
 	pcf8563->clkout_hw.init = &init;
@@ -580,8 +578,6 @@ static int pcf8563_probe(struct i2c_client *client,
 	if (!pcf8563)
 		return -ENOMEM;
 
-	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
-
 	i2c_set_clientdata(client, pcf8563);
 	pcf8563->client = client;
 	device_set_wakeup_capable(&client->dev, 1);
@@ -662,4 +658,3 @@ module_i2c_driver(pcf8563_driver);
 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-rs5c313.c

@@ -50,7 +50,6 @@
 #include <linux/io.h>
 
 #define DRV_NAME	"rs5c313"
-#define DRV_VERSION	"1.13"
 
 #ifdef CONFIG_SH_LANDISK
 /*****************************************************/
@@ -407,7 +406,6 @@ static void __exit rs5c313_rtc_exit(void)
 module_init(rs5c313_rtc_init);
 module_exit(rs5c313_rtc_exit);
 
-MODULE_VERSION(DRV_VERSION);
 MODULE_AUTHOR("kogiidena , Nobuhiro Iwamatsu <iwamatsu@nigauri.org>");
 MODULE_DESCRIPTION("Ricoh RS5C313 RTC device driver");
 MODULE_LICENSE("GPL");

drivers/rtc/rtc-rs5c348.c

@@ -25,8 +25,6 @@
 #include <linux/spi/spi.h>
 #include <linux/module.h>
 
-#define DRV_VERSION "0.2"
-
 #define RS5C348_REG_SECS	0
 #define RS5C348_REG_MINS	1
 #define RS5C348_REG_HOURS	2
@@ -171,7 +169,6 @@ static int rs5c348_probe(struct spi_device *spi)
 		goto kfree_exit;
 	}
 
-	dev_info(&spi->dev, "chip found, driver version " DRV_VERSION "\n");
 	dev_info(&spi->dev, "spiclk %u KHz.\n",
 		 (spi->max_speed_hz + 500) / 1000);
 
@@ -230,5 +227,4 @@ module_spi_driver(rs5c348_driver);
 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 MODULE_DESCRIPTION("Ricoh RS5C348 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("spi:rtc-rs5c348");

drivers/rtc/rtc-rs5c372.c

@@ -16,9 +16,6 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 
-#define DRV_VERSION "0.6"
-
-
 /*
  * Ricoh has a family of I2C based RTCs, which differ only slightly from
  * each other.  Differences center on pinout (e.g. how many interrupts,
@@ -240,11 +237,11 @@ static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 	return 0;
 }
 
-#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
+#if IS_ENABLED(CONFIG_RTC_INTF_PROC)
 #define	NEED_TRIM
 #endif
 
-#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
+#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS)
 #define	NEED_TRIM
 #endif
 
@@ -412,7 +409,7 @@ static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	return 0;
 }
 
-#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
+#if IS_ENABLED(CONFIG_RTC_INTF_PROC)
 
 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
 {
@@ -441,7 +438,7 @@ static const struct rtc_class_ops rs5c372_rtc_ops = {
 	.alarm_irq_enable = rs5c_rtc_alarm_irq_enable,
 };
 
-#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
+#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS)
 
 static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
 				struct device_attribute *attr, char *buf)
@@ -509,9 +506,9 @@ static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
 	int addr, i, ret = 0;
 
 	if (rs5c372->type == rtc_r2025sd) {
-		if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST))
+		if (rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST)
 			return ret;
-		rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST;
+		rs5c372->regs[RS5C_REG_CTRL2] |= R2025_CTRL2_XST;
 	} else {
 		if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
 			return ret;
@@ -640,7 +637,7 @@ static int rs5c372_probe(struct i2c_client *client,
 	if (rs5c372_get_datetime(client, &tm) < 0)
 		dev_warn(&client->dev, "clock needs to be set\n");
 
-	dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
+	dev_info(&client->dev, "%s found, %s\n",
 			({ char *s; switch (rs5c372->type) {
 			case rtc_r2025sd:	s = "r2025sd"; break;
 			case rtc_r2221tl:	s = "r2221tl"; break;
@@ -696,4 +693,3 @@ MODULE_AUTHOR(
 		"Paul Mundt <lethal@linux-sh.org>");
 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-rx8581.c

@@ -18,8 +18,6 @@
 #include <linux/rtc.h>
 #include <linux/log2.h>
 
-#define DRV_VERSION "0.1"
-
 #define RX8581_REG_SC		0x00 /* Second in BCD */
 #define RX8581_REG_MN		0x01 /* Minute in BCD */
 #define RX8581_REG_HR		0x02 /* Hour in BCD */
@@ -292,8 +290,6 @@ static int rx8581_probe(struct i2c_client *client,
 		rx8581->write_block_data = rx8581_write_block_data;
 	}
 
-	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
-
 	rx8581->rtc = devm_rtc_device_register(&client->dev,
 		rx8581_driver.driver.name, &rx8581_rtc_ops, THIS_MODULE);
 
@@ -325,4 +321,3 @@ module_i2c_driver(rx8581_driver);
 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
 MODULE_DESCRIPTION("Epson RX-8581 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-sh.c

@@ -30,7 +30,6 @@
 #include <asm/rtc.h>
 
 #define DRV_NAME	"sh-rtc"
-#define DRV_VERSION	"0.2.3"
 
 #define RTC_REG(r)	((r) * rtc_reg_size)
 
@@ -790,7 +789,6 @@ static struct platform_driver sh_rtc_platform_driver = {
 module_platform_driver_probe(sh_rtc_platform_driver, sh_rtc_probe);
 
 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
-MODULE_VERSION(DRV_VERSION);
 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
 	      "Jamie Lenehan <lenehan@twibble.org>, "
 	      "Angelo Castello <angelo.castello@st.com>");

drivers/rtc/rtc-snvs.c

@@ -322,7 +322,7 @@ static int snvs_rtc_suspend(struct device *dev)
 	struct snvs_rtc_data *data = dev_get_drvdata(dev);
 
 	if (device_may_wakeup(dev))
-		enable_irq_wake(data->irq);
+		return enable_irq_wake(data->irq);
 
 	return 0;
 }

drivers/rtc/rtc-stk17ta8.c

@@ -23,8 +23,6 @@
 #include <linux/io.h>
 #include <linux/module.h>
 
-#define DRV_VERSION "0.1"
-
 #define RTC_REG_SIZE		0x20000
 #define RTC_OFFSET		0x1fff0
 
@@ -366,4 +364,3 @@ module_platform_driver(stk17ta8_rtc_driver);
 MODULE_AUTHOR("Thomas Hommel <thomas.hommel@ge.com>");
 MODULE_DESCRIPTION("Simtek STK17TA8 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-stmp3xxx.c

@@ -107,14 +107,19 @@ static struct stmp3xxx_wdt_pdata wdt_pdata = {
 
 static void stmp3xxx_wdt_register(struct platform_device *rtc_pdev)
 {
+	int rc = -1;
 	struct platform_device *wdt_pdev =
 		platform_device_alloc("stmp3xxx_rtc_wdt", rtc_pdev->id);
 
 	if (wdt_pdev) {
 		wdt_pdev->dev.parent = &rtc_pdev->dev;
 		wdt_pdev->dev.platform_data = &wdt_pdata;
-		platform_device_add(wdt_pdev);
+		rc = platform_device_add(wdt_pdev);
 	}
+
+	if (rc)
+		dev_err(&rtc_pdev->dev,
+			"failed to register stmp3xxx_rtc_wdt\n");
 }
 #else
 static void stmp3xxx_wdt_register(struct platform_device *rtc_pdev)

drivers/rtc/rtc-tps6586x.c

@@ -344,7 +344,7 @@ static struct platform_driver tps6586x_rtc_driver = {
 };
 module_platform_driver(tps6586x_rtc_driver);
 
-MODULE_ALIAS("platform:rtc-tps6586x");
+MODULE_ALIAS("platform:tps6586x-rtc");
 MODULE_DESCRIPTION("TI TPS6586x RTC driver");
 MODULE_AUTHOR("Laxman dewangan <ldewangan@nvidia.com>");
 MODULE_LICENSE("GPL v2");

drivers/rtc/rtc-x1205.c

@@ -24,8 +24,6 @@
 #include <linux/module.h>
 #include <linux/bitops.h>
 
-#define DRV_VERSION "1.0.8"
-
 /* offsets into CCR area */
 
 #define CCR_SEC			0
@@ -634,8 +632,6 @@ static int x1205_probe(struct i2c_client *client,
 	if (x1205_validate_client(client) < 0)
 		return -ENODEV;
 
-	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
-
 	rtc = devm_rtc_device_register(&client->dev, x1205_driver.driver.name,
 					&x1205_rtc_ops, THIS_MODULE);
 
@@ -693,4 +689,3 @@ MODULE_AUTHOR(
 	"Alessandro Zummo <a.zummo@towertech.it>");
 MODULE_DESCRIPTION("Xicor/Intersil X1205 RTC driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);

drivers/rtc/rtc-zynqmp.c

@@ -45,6 +45,7 @@
 #define RTC_INT_SEC		BIT(0)
 #define RTC_INT_ALRM		BIT(1)
 #define RTC_OSC_EN		BIT(24)
+#define RTC_BATT_EN		BIT(31)
 
 #define RTC_CALIB_DEF		0x198233
 #define RTC_CALIB_MASK		0x1FFFFF
@@ -55,6 +56,7 @@ struct xlnx_rtc_dev {
 	void __iomem		*reg_base;
 	int			alarm_irq;
 	int			sec_irq;
+	int			calibval;
 };
 
 static int xlnx_rtc_set_time(struct device *dev, struct rtc_time *tm)
@@ -62,21 +64,63 @@ static int xlnx_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	struct xlnx_rtc_dev *xrtcdev = dev_get_drvdata(dev);
 	unsigned long new_time;
 
-	new_time = rtc_tm_to_time64(tm);
+	/*
+	 * The value written will be updated after 1 sec into the
+	 * seconds read register, so we need to program time +1 sec
+	 * to get the correct time on read.
+	 */
+	new_time = rtc_tm_to_time64(tm) + 1;
 
 	if (new_time > RTC_SEC_MAX_VAL)
 		return -EINVAL;
 
+	/*
+	 * Writing into calibration register will clear the Tick Counter and
+	 * force the next second to be signaled exactly in 1 second period
+	 */
+	xrtcdev->calibval &= RTC_CALIB_MASK;
+	writel(xrtcdev->calibval, (xrtcdev->reg_base + RTC_CALIB_WR));
+
 	writel(new_time, xrtcdev->reg_base + RTC_SET_TM_WR);
 
+	/*
+	 * Clear the rtc interrupt status register after setting the
+	 * time. During a read_time function, the code should read the
+	 * RTC_INT_STATUS register and if bit 0 is still 0, it means
+	 * that one second has not elapsed yet since RTC was set and
+	 * the current time should be read from SET_TIME_READ register;
+	 * otherwise, CURRENT_TIME register is read to report the time
+	 */
+	writel(RTC_INT_SEC, xrtcdev->reg_base + RTC_INT_STS);
+
 	return 0;
 }
 
 static int xlnx_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
+	u32 status;
+	unsigned long read_time;
 	struct xlnx_rtc_dev *xrtcdev = dev_get_drvdata(dev);
 
-	rtc_time64_to_tm(readl(xrtcdev->reg_base + RTC_CUR_TM), tm);
+	status = readl(xrtcdev->reg_base + RTC_INT_STS);
+
+	if (status & RTC_INT_SEC) {
+		/*
+		 * RTC has updated the CURRENT_TIME with the time written into
+		 * SET_TIME_WRITE register.
+		 */
+		rtc_time64_to_tm(readl(xrtcdev->reg_base + RTC_CUR_TM), tm);
+	} else {
+		/*
+		 * Time written in SET_TIME_WRITE has not yet updated into
+		 * the seconds read register, so read the time from the
+		 * SET_TIME_WRITE instead of CURRENT_TIME register.
+		 * Since we add +1 sec while writing, we need to -1 sec while
+		 * reading.
+		 */
+		read_time = readl(xrtcdev->reg_base + RTC_SET_TM_RD) - 1;
+		rtc_time64_to_tm(read_time, tm);
+	}
 
 	return rtc_valid_tm(tm);
 }
@@ -120,16 +164,23 @@ static int xlnx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	return 0;
 }
 
-static void xlnx_init_rtc(struct xlnx_rtc_dev *xrtcdev, u32 calibval)
+static void xlnx_init_rtc(struct xlnx_rtc_dev *xrtcdev)
 {
+	u32 rtc_ctrl;
+
+	/* Enable RTC switch to battery when VCC_PSAUX is not available */
+	rtc_ctrl = readl(xrtcdev->reg_base + RTC_CTRL);
+	rtc_ctrl |= RTC_BATT_EN;
+	writel(rtc_ctrl, xrtcdev->reg_base + RTC_CTRL);
+
 	/*
 	 * Based on crystal freq of 33.330 KHz
 	 * set the seconds counter and enable, set fractions counter
 	 * to default value suggested as per design spec
 	 * to correct RTC delay in frequency over period of time.
 	 */
-	calibval &= RTC_CALIB_MASK;
-	writel(calibval, (xrtcdev->reg_base + RTC_CALIB_WR));
+	xrtcdev->calibval &= RTC_CALIB_MASK;
+	writel(xrtcdev->calibval, (xrtcdev->reg_base + RTC_CALIB_WR));
 }
 
 static const struct rtc_class_ops xlnx_rtc_ops = {
@@ -150,11 +201,9 @@ static irqreturn_t xlnx_rtc_interrupt(int irq, void *id)
 	if (!(status & (RTC_INT_SEC | RTC_INT_ALRM)))
 		return IRQ_NONE;
 
-	/* Clear interrupt */
-	writel(status, xrtcdev->reg_base + RTC_INT_STS);
+	/* Clear RTC_INT_ALRM interrupt only */
+	writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_STS);
 
-	if (status & RTC_INT_SEC)
-		rtc_update_irq(xrtcdev->rtc, 1, RTC_IRQF | RTC_UF);
 	if (status & RTC_INT_ALRM)
 		rtc_update_irq(xrtcdev->rtc, 1, RTC_IRQF | RTC_AF);
 
@@ -166,7 +215,6 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 	struct xlnx_rtc_dev *xrtcdev;
 	struct resource *res;
 	int ret;
-	unsigned int calibvalue;
 
 	xrtcdev = devm_kzalloc(&pdev->dev, sizeof(*xrtcdev), GFP_KERNEL);
 	if (!xrtcdev)
@@ -207,11 +255,11 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 	}
 
 	ret = of_property_read_u32(pdev->dev.of_node, "calibration",
-				   &calibvalue);
+				   &xrtcdev->calibval);
 	if (ret)
-		calibvalue = RTC_CALIB_DEF;
+		xrtcdev->calibval = RTC_CALIB_DEF;
 
-	xlnx_init_rtc(xrtcdev, calibvalue);
+	xlnx_init_rtc(xrtcdev);
 
 	device_init_wakeup(&pdev->dev, 1);