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

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

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

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

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

1 files changed, 232 insertions, 225 deletions

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 4b43aa62fbc7..e7d9215c9201 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -39,6 +39,7 @@ enum ds_type {
 	ds_1338,
 	ds_1339,
 	ds_1340,
+	ds_1341,
 	ds_1388,
 	ds_3231,
 	m41t0,
@@ -50,7 +51,6 @@ enum ds_type {
 	/* rs5c372 too?  different address... */
 };
 
-
 /* RTC registers don't differ much, except for the century flag */
 #define DS1307_REG_SECS		0x00	/* 00-59 */
 #	define DS1307_BIT_CH		0x80
@@ -113,11 +113,7 @@ enum ds_type {
 #	define RX8025_BIT_VDET		0x40
 #	define RX8025_BIT_XST		0x20
 
-
 struct ds1307 {
-	u8			offset; /* register's offset */
-	u8			regs[11];
-	u16			nvram_offset;
 	struct nvmem_config	nvmem_cfg;
 	enum ds_type		type;
 	unsigned long		flags;
@@ -126,7 +122,6 @@ struct ds1307 {
 	struct device		*dev;
 	struct regmap		*regmap;
 	const char		*name;
-	int			irq;
 	struct rtc_device	*rtc;
 #ifdef CONFIG_COMMON_CLK
 	struct clk_hw		clks[2];
@@ -137,18 +132,47 @@ struct chip_desc {
 	unsigned		alarm:1;
 	u16			nvram_offset;
 	u16			nvram_size;
+	u8			offset; /* register's offset */
 	u8			century_reg;
 	u8			century_enable_bit;
 	u8			century_bit;
+	u8			bbsqi_bit;
+	irq_handler_t		irq_handler;
+	const struct rtc_class_ops *rtc_ops;
 	u16			trickle_charger_reg;
-	u8			trickle_charger_setup;
-	u8			(*do_trickle_setup)(struct ds1307 *, uint32_t,
+	u8			(*do_trickle_setup)(struct ds1307 *, u32,
 						    bool);
 };
 
-static u8 do_trickle_setup_ds1339(struct ds1307 *, uint32_t ohms, bool diode);
+static int ds1307_get_time(struct device *dev, struct rtc_time *t);
+static int ds1307_set_time(struct device *dev, struct rtc_time *t);
+static u8 do_trickle_setup_ds1339(struct ds1307 *, u32 ohms, bool diode);
+static irqreturn_t rx8130_irq(int irq, void *dev_id);
+static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled);
+static irqreturn_t mcp794xx_irq(int irq, void *dev_id);
+static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled);
 
-static struct chip_desc chips[last_ds_type] = {
+static const struct rtc_class_ops rx8130_rtc_ops = {
+	.read_time      = ds1307_get_time,
+	.set_time       = ds1307_set_time,
+	.read_alarm     = rx8130_read_alarm,
+	.set_alarm      = rx8130_set_alarm,
+	.alarm_irq_enable = rx8130_alarm_irq_enable,
+};
+
+static const struct rtc_class_ops mcp794xx_rtc_ops = {
+	.read_time      = ds1307_get_time,
+	.set_time       = ds1307_set_time,
+	.read_alarm     = mcp794xx_read_alarm,
+	.set_alarm      = mcp794xx_set_alarm,
+	.alarm_irq_enable = mcp794xx_alarm_irq_enable,
+};
+
+static const struct chip_desc chips[last_ds_type] = {
 	[ds_1307] = {
 		.nvram_offset	= 8,
 		.nvram_size	= 56,
@@ -170,6 +194,7 @@ static struct chip_desc chips[last_ds_type] = {
 		.alarm		= 1,
 		.century_reg	= DS1307_REG_MONTH,
 		.century_bit	= DS1337_BIT_CENTURY,
+		.bbsqi_bit	= DS1339_BIT_BBSQI,
 		.trickle_charger_reg = 0x10,
 		.do_trickle_setup = &do_trickle_setup_ds1339,
 	},
@@ -179,25 +204,36 @@ static struct chip_desc chips[last_ds_type] = {
 		.century_bit	= DS1340_BIT_CENTURY,
 		.trickle_charger_reg = 0x08,
 	},
+	[ds_1341] = {
+		.century_reg	= DS1307_REG_MONTH,
+		.century_bit	= DS1337_BIT_CENTURY,
+	},
 	[ds_1388] = {
+		.offset		= 1,
 		.trickle_charger_reg = 0x0a,
 	},
 	[ds_3231] = {
 		.alarm		= 1,
 		.century_reg	= DS1307_REG_MONTH,
 		.century_bit	= DS1337_BIT_CENTURY,
+		.bbsqi_bit	= DS3231_BIT_BBSQW,
 	},
 	[rx_8130] = {
 		.alarm		= 1,
 		/* this is battery backed SRAM */
 		.nvram_offset	= 0x20,
 		.nvram_size	= 4,	/* 32bit (4 word x 8 bit) */
+		.offset		= 0x10,
+		.irq_handler = rx8130_irq,
+		.rtc_ops = &rx8130_rtc_ops,
 	},
 	[mcp794xx] = {
 		.alarm		= 1,
 		/* this is battery backed SRAM */
 		.nvram_offset	= 0x20,
 		.nvram_size	= 0x40,
+		.irq_handler = mcp794xx_irq,
+		.rtc_ops = &mcp794xx_rtc_ops,
 	},
 };
 
@@ -209,6 +245,7 @@ static const struct i2c_device_id ds1307_id[] = {
 	{ "ds1339", ds_1339 },
 	{ "ds1388", ds_1388 },
 	{ "ds1340", ds_1340 },
+	{ "ds1341", ds_1341 },
 	{ "ds3231", ds_3231 },
 	{ "m41t0", m41t0 },
 	{ "m41t00", m41t00 },
@@ -253,6 +290,10 @@ static const struct of_device_id ds1307_of_match[] = {
 		.data = (void *)ds_1340
 	},
 	{
+		.compatible = "dallas,ds1341",
+		.data = (void *)ds_1341
+	},
+	{
 		.compatible = "maxim,ds3231",
 		.data = (void *)ds_3231
 	},
@@ -298,6 +339,7 @@ static const struct acpi_device_id ds1307_acpi_ids[] = {
 	{ .id = "DS1339", .driver_data = ds_1339 },
 	{ .id = "DS1388", .driver_data = ds_1388 },
 	{ .id = "DS1340", .driver_data = ds_1340 },
+	{ .id = "DS1341", .driver_data = ds_1341 },
 	{ .id = "DS3231", .driver_data = ds_3231 },
 	{ .id = "M41T0", .driver_data = m41t0 },
 	{ .id = "M41T00", .driver_data = m41t00 },
@@ -352,34 +394,36 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
 	struct ds1307	*ds1307 = dev_get_drvdata(dev);
 	int		tmp, ret;
 	const struct chip_desc *chip = &chips[ds1307->type];
+	u8 regs[7];
 
 	/* read the RTC date and time registers all at once */
-	ret = regmap_bulk_read(ds1307->regmap, ds1307->offset, ds1307->regs, 7);
+	ret = regmap_bulk_read(ds1307->regmap, chip->offset, regs,
+			       sizeof(regs));
 	if (ret) {
 		dev_err(dev, "%s error %d\n", "read", ret);
 		return ret;
 	}
 
-	dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs);
+	dev_dbg(dev, "%s: %7ph\n", "read", regs);
 
 	/* if oscillator fail bit is set, no data can be trusted */
 	if (ds1307->type == m41t0 &&
-	    ds1307->regs[DS1307_REG_MIN] & M41T0_BIT_OF) {
+	    regs[DS1307_REG_MIN] & M41T0_BIT_OF) {
 		dev_warn_once(dev, "oscillator failed, set time!\n");
 		return -EINVAL;
 	}
 
-	t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f);
-	t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f);
-	tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f;
+	t->tm_sec = bcd2bin(regs[DS1307_REG_SECS] & 0x7f);
+	t->tm_min = bcd2bin(regs[DS1307_REG_MIN] & 0x7f);
+	tmp = regs[DS1307_REG_HOUR] & 0x3f;
 	t->tm_hour = bcd2bin(tmp);
-	t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1;
-	t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f);
-	tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f;
+	t->tm_wday = bcd2bin(regs[DS1307_REG_WDAY] & 0x07) - 1;
+	t->tm_mday = bcd2bin(regs[DS1307_REG_MDAY] & 0x3f);
+	tmp = regs[DS1307_REG_MONTH] & 0x1f;
 	t->tm_mon = bcd2bin(tmp) - 1;
-	t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
+	t->tm_year = bcd2bin(regs[DS1307_REG_YEAR]) + 100;
 
-	if (ds1307->regs[chip->century_reg] & chip->century_bit &&
+	if (regs[chip->century_reg] & chip->century_bit &&
 	    IS_ENABLED(CONFIG_RTC_DRV_DS1307_CENTURY))
 		t->tm_year += 100;
 
@@ -399,7 +443,7 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 	const struct chip_desc *chip = &chips[ds1307->type];
 	int		result;
 	int		tmp;
-	u8		*buf = ds1307->regs;
+	u8		regs[7];
 
 	dev_dbg(dev, "%s secs=%d, mins=%d, "
 		"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
@@ -418,35 +462,36 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 		return -EINVAL;
 #endif
 
-	buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
-	buf[DS1307_REG_MIN] = bin2bcd(t->tm_min);
-	buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
-	buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1);
-	buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday);
-	buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1);
+	regs[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
+	regs[DS1307_REG_MIN] = bin2bcd(t->tm_min);
+	regs[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
+	regs[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1);
+	regs[DS1307_REG_MDAY] = bin2bcd(t->tm_mday);
+	regs[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1);
 
 	/* assume 20YY not 19YY */
 	tmp = t->tm_year - 100;
-	buf[DS1307_REG_YEAR] = bin2bcd(tmp);
+	regs[DS1307_REG_YEAR] = bin2bcd(tmp);
 
 	if (chip->century_enable_bit)
-		buf[chip->century_reg] |= chip->century_enable_bit;
+		regs[chip->century_reg] |= chip->century_enable_bit;
 	if (t->tm_year > 199 && chip->century_bit)
-		buf[chip->century_reg] |= chip->century_bit;
+		regs[chip->century_reg] |= chip->century_bit;
 
 	if (ds1307->type == mcp794xx) {
 		/*
 		 * these bits were cleared when preparing the date/time
 		 * values and need to be set again before writing the
-		 * buffer out to the device.
+		 * regsfer out to the device.
 		 */
-		buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
-		buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
+		regs[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
+		regs[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
 	}
 
-	dev_dbg(dev, "%s: %7ph\n", "write", buf);
+	dev_dbg(dev, "%s: %7ph\n", "write", regs);
 
-	result = regmap_bulk_write(ds1307->regmap, ds1307->offset, buf, 7);
+	result = regmap_bulk_write(ds1307->regmap, chip->offset, regs,
+				   sizeof(regs));
 	if (result) {
 		dev_err(dev, "%s error %d\n", "write", result);
 		return result;
@@ -458,33 +503,34 @@ static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct ds1307		*ds1307 = dev_get_drvdata(dev);
 	int			ret;
+	u8			regs[9];
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
 	/* read all ALARM1, ALARM2, and status registers at once */
 	ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS,
-			       ds1307->regs, 9);
+			       regs, sizeof(regs));
 	if (ret) {
 		dev_err(dev, "%s error %d\n", "alarm read", ret);
 		return ret;
 	}
 
 	dev_dbg(dev, "%s: %4ph, %3ph, %2ph\n", "alarm read",
-		&ds1307->regs[0], &ds1307->regs[4], &ds1307->regs[7]);
+		&regs[0], &regs[4], &regs[7]);
 
 	/*
 	 * report alarm time (ALARM1); assume 24 hour and day-of-month modes,
 	 * and that all four fields are checked matches
 	 */
-	t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f);
-	t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f);
-	t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f);
-	t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f);
+	t->time.tm_sec = bcd2bin(regs[0] & 0x7f);
+	t->time.tm_min = bcd2bin(regs[1] & 0x7f);
+	t->time.tm_hour = bcd2bin(regs[2] & 0x3f);
+	t->time.tm_mday = bcd2bin(regs[3] & 0x3f);
 
 	/* ... and status */
-	t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE);
-	t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I);
+	t->enabled = !!(regs[7] & DS1337_BIT_A1IE);
+	t->pending = !!(regs[8] & DS1337_BIT_A1I);
 
 	dev_dbg(dev, "%s secs=%d, mins=%d, "
 		"hours=%d, mday=%d, enabled=%d, pending=%d\n",
@@ -498,7 +544,7 @@ static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct ds1307		*ds1307 = dev_get_drvdata(dev);
-	unsigned char		*buf = ds1307->regs;
+	unsigned char		regs[9];
 	u8			control, status;
 	int			ret;
 
@@ -512,33 +558,35 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* read current status of both alarms and the chip */
-	ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS, buf, 9);
+	ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS, regs,
+			       sizeof(regs));
 	if (ret) {
 		dev_err(dev, "%s error %d\n", "alarm write", ret);
 		return ret;
 	}
-	control = ds1307->regs[7];
-	status = ds1307->regs[8];
+	control = regs[7];
+	status = regs[8];
 
 	dev_dbg(dev, "%s: %4ph, %3ph, %02x %02x\n", "alarm set (old status)",
-		&ds1307->regs[0], &ds1307->regs[4], control, status);
+		&regs[0], &regs[4], control, status);
 
 	/* set ALARM1, using 24 hour and day-of-month modes */
-	buf[0] = bin2bcd(t->time.tm_sec);
-	buf[1] = bin2bcd(t->time.tm_min);
-	buf[2] = bin2bcd(t->time.tm_hour);
-	buf[3] = bin2bcd(t->time.tm_mday);
+	regs[0] = bin2bcd(t->time.tm_sec);
+	regs[1] = bin2bcd(t->time.tm_min);
+	regs[2] = bin2bcd(t->time.tm_hour);
+	regs[3] = bin2bcd(t->time.tm_mday);
 
 	/* set ALARM2 to non-garbage */
-	buf[4] = 0;
-	buf[5] = 0;
-	buf[6] = 0;
+	regs[4] = 0;
+	regs[5] = 0;
+	regs[6] = 0;
 
 	/* disable alarms */
-	buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
-	buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
+	regs[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
+	regs[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
 
-	ret = regmap_bulk_write(ds1307->regmap, DS1339_REG_ALARM1_SECS, buf, 9);
+	ret = regmap_bulk_write(ds1307->regmap, DS1339_REG_ALARM1_SECS, regs,
+				sizeof(regs));
 	if (ret) {
 		dev_err(dev, "can't set alarm time\n");
 		return ret;
@@ -547,8 +595,8 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	/* optionally enable ALARM1 */
 	if (t->enabled) {
 		dev_dbg(dev, "alarm IRQ armed\n");
-		buf[7] |= DS1337_BIT_A1IE;	/* only ALARM1 is used */
-		regmap_write(ds1307->regmap, DS1337_REG_CONTROL, buf[7]);
+		regs[7] |= DS1337_BIT_A1IE;	/* only ALARM1 is used */
+		regmap_write(ds1307->regmap, DS1337_REG_CONTROL, regs[7]);
 	}
 
 	return 0;
@@ -584,11 +632,11 @@ static const struct rtc_class_ops ds13xx_rtc_ops = {
 #define RX8130_REG_ALARM_HOUR		0x08
 #define RX8130_REG_ALARM_WEEK_OR_DAY	0x09
 #define RX8130_REG_EXTENSION		0x0c
-#define RX8130_REG_EXTENSION_WADA	(1 << 3)
+#define RX8130_REG_EXTENSION_WADA	BIT(3)
 #define RX8130_REG_FLAG			0x0d
-#define RX8130_REG_FLAG_AF		(1 << 3)
+#define RX8130_REG_FLAG_AF		BIT(3)
 #define RX8130_REG_CONTROL0		0x0e
-#define RX8130_REG_CONTROL0_AIE		(1 << 3)
+#define RX8130_REG_CONTROL0_AIE		BIT(3)
 
 static irqreturn_t rx8130_irq(int irq, void *dev_id)
 {
@@ -600,7 +648,8 @@ static irqreturn_t rx8130_irq(int irq, void *dev_id)
 	mutex_lock(lock);
 
 	/* Read control registers. */
-	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+			       sizeof(ctl));
 	if (ret < 0)
 		goto out;
 	if (!(ctl[1] & RX8130_REG_FLAG_AF))
@@ -608,7 +657,8 @@ static irqreturn_t rx8130_irq(int irq, void *dev_id)
 	ctl[1] &= ~RX8130_REG_FLAG_AF;
 	ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
 
-	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+				sizeof(ctl));
 	if (ret < 0)
 		goto out;
 
@@ -630,12 +680,14 @@ static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 		return -EINVAL;
 
 	/* Read alarm registers. */
-	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3);
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald,
+			       sizeof(ald));
 	if (ret < 0)
 		return ret;
 
 	/* Read control registers. */
-	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+			       sizeof(ctl));
 	if (ret < 0)
 		return ret;
 
@@ -676,7 +728,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* Read control registers. */
-	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+			       sizeof(ctl));
 	if (ret < 0)
 		return ret;
 
@@ -684,7 +737,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	ctl[1] |= RX8130_REG_FLAG_AF;
 	ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
 
-	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+				sizeof(ctl));
 	if (ret < 0)
 		return ret;
 
@@ -693,7 +747,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	ald[1] = bin2bcd(t->time.tm_hour);
 	ald[2] = bin2bcd(t->time.tm_mday);
 
-	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3);
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald,
+				sizeof(ald));
 	if (ret < 0)
 		return ret;
 
@@ -702,7 +757,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 
 	ctl[2] |= RX8130_REG_CONTROL0_AIE;
 
-	return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
+				 sizeof(ctl));
 }
 
 static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
@@ -725,14 +781,6 @@ static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
 	return regmap_write(ds1307->regmap, RX8130_REG_CONTROL0, reg);
 }
 
-static const struct rtc_class_ops rx8130_rtc_ops = {
-	.read_time	= ds1307_get_time,
-	.set_time	= ds1307_set_time,
-	.read_alarm	= rx8130_read_alarm,
-	.set_alarm	= rx8130_set_alarm,
-	.alarm_irq_enable = rx8130_alarm_irq_enable,
-};
-
 /*----------------------------------------------------------------------*/
 
 /*
@@ -748,11 +796,11 @@ static const struct rtc_class_ops rx8130_rtc_ops = {
 #define MCP794XX_REG_ALARM0_CTRL	0x0d
 #define MCP794XX_REG_ALARM1_BASE	0x11
 #define MCP794XX_REG_ALARM1_CTRL	0x14
-#	define MCP794XX_BIT_ALMX_IF	(1 << 3)
-#	define MCP794XX_BIT_ALMX_C0	(1 << 4)
-#	define MCP794XX_BIT_ALMX_C1	(1 << 5)
-#	define MCP794XX_BIT_ALMX_C2	(1 << 6)
-#	define MCP794XX_BIT_ALMX_POL	(1 << 7)
+#	define MCP794XX_BIT_ALMX_IF	BIT(3)
+#	define MCP794XX_BIT_ALMX_C0	BIT(4)
+#	define MCP794XX_BIT_ALMX_C1	BIT(5)
+#	define MCP794XX_BIT_ALMX_C2	BIT(6)
+#	define MCP794XX_BIT_ALMX_POL	BIT(7)
 #	define MCP794XX_MSK_ALMX_MATCH	(MCP794XX_BIT_ALMX_C0 | \
 					 MCP794XX_BIT_ALMX_C1 | \
 					 MCP794XX_BIT_ALMX_C2)
@@ -793,37 +841,38 @@ out:
 static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct ds1307 *ds1307 = dev_get_drvdata(dev);
-	u8 *regs = ds1307->regs;
+	u8 regs[10];
 	int ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
 	/* Read control and alarm 0 registers. */
-	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
+			       sizeof(regs));
 	if (ret)
 		return ret;
 
 	t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN);
 
 	/* Report alarm 0 time assuming 24-hour and day-of-month modes. */
-	t->time.tm_sec = bcd2bin(ds1307->regs[3] & 0x7f);
-	t->time.tm_min = bcd2bin(ds1307->regs[4] & 0x7f);
-	t->time.tm_hour = bcd2bin(ds1307->regs[5] & 0x3f);
-	t->time.tm_wday = bcd2bin(ds1307->regs[6] & 0x7) - 1;
-	t->time.tm_mday = bcd2bin(ds1307->regs[7] & 0x3f);
-	t->time.tm_mon = bcd2bin(ds1307->regs[8] & 0x1f) - 1;
+	t->time.tm_sec = bcd2bin(regs[3] & 0x7f);
+	t->time.tm_min = bcd2bin(regs[4] & 0x7f);
+	t->time.tm_hour = bcd2bin(regs[5] & 0x3f);
+	t->time.tm_wday = bcd2bin(regs[6] & 0x7) - 1;
+	t->time.tm_mday = bcd2bin(regs[7] & 0x3f);
+	t->time.tm_mon = bcd2bin(regs[8] & 0x1f) - 1;
 	t->time.tm_year = -1;
 	t->time.tm_yday = -1;
 	t->time.tm_isdst = -1;
 
 	dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
-		"enabled=%d polarity=%d irq=%d match=%d\n", __func__,
+		"enabled=%d polarity=%d irq=%d match=%lu\n", __func__,
 		t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
 		t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled,
-		!!(ds1307->regs[6] & MCP794XX_BIT_ALMX_POL),
-		!!(ds1307->regs[6] & MCP794XX_BIT_ALMX_IF),
-		(ds1307->regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4);
+		!!(regs[6] & MCP794XX_BIT_ALMX_POL),
+		!!(regs[6] & MCP794XX_BIT_ALMX_IF),
+		(regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4);
 
 	return 0;
 }
@@ -831,7 +880,7 @@ static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct ds1307 *ds1307 = dev_get_drvdata(dev);
-	unsigned char *regs = ds1307->regs;
+	unsigned char regs[10];
 	int ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
@@ -844,7 +893,8 @@ static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* Read control and alarm 0 registers. */
-	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
+			       sizeof(regs));
 	if (ret)
 		return ret;
 
@@ -863,7 +913,8 @@ static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	/* Disable interrupt. We will not enable until completely programmed */
 	regs[0] &= ~MCP794XX_BIT_ALM0_EN;
 
-	ret = regmap_bulk_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	ret = regmap_bulk_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs,
+				sizeof(regs));
 	if (ret)
 		return ret;
 
@@ -885,22 +936,15 @@ static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
 				  enabled ? MCP794XX_BIT_ALM0_EN : 0);
 }
 
-static const struct rtc_class_ops mcp794xx_rtc_ops = {
-	.read_time	= ds1307_get_time,
-	.set_time	= ds1307_set_time,
-	.read_alarm	= mcp794xx_read_alarm,
-	.set_alarm	= mcp794xx_set_alarm,
-	.alarm_irq_enable = mcp794xx_alarm_irq_enable,
-};
-
 /*----------------------------------------------------------------------*/
 
 static int ds1307_nvram_read(void *priv, unsigned int offset, void *val,
 			     size_t bytes)
 {
 	struct ds1307 *ds1307 = priv;
+	const struct chip_desc *chip = &chips[ds1307->type];
 
-	return regmap_bulk_read(ds1307->regmap, ds1307->nvram_offset + offset,
+	return regmap_bulk_read(ds1307->regmap, chip->nvram_offset + offset,
 				val, bytes);
 }
 
@@ -908,15 +952,16 @@ static int ds1307_nvram_write(void *priv, unsigned int offset, void *val,
 			      size_t bytes)
 {
 	struct ds1307 *ds1307 = priv;
+	const struct chip_desc *chip = &chips[ds1307->type];
 
-	return regmap_bulk_write(ds1307->regmap, ds1307->nvram_offset + offset,
+	return regmap_bulk_write(ds1307->regmap, chip->nvram_offset + offset,
 				 val, bytes);
 }
 
 /*----------------------------------------------------------------------*/
 
 static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307,
-				  uint32_t ohms, bool diode)
+				  u32 ohms, bool diode)
 {
 	u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE :
 		DS1307_TRICKLE_CHARGER_NO_DIODE;
@@ -939,23 +984,23 @@ static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307,
 	return setup;
 }
 
-static void ds1307_trickle_init(struct ds1307 *ds1307,
-				struct chip_desc *chip)
+static u8 ds1307_trickle_init(struct ds1307 *ds1307,
+			      const struct chip_desc *chip)
 {
-	uint32_t ohms = 0;
+	u32 ohms;
 	bool diode = true;
 
 	if (!chip->do_trickle_setup)
-		goto out;
+		return 0;
+
 	if (device_property_read_u32(ds1307->dev, "trickle-resistor-ohms",
 				     &ohms))
-		goto out;
+		return 0;
+
 	if (device_property_read_bool(ds1307->dev, "trickle-diode-disable"))
 		diode = false;
-	chip->trickle_charger_setup = chip->do_trickle_setup(ds1307,
-							     ohms, diode);
-out:
-	return;
+
+	return chip->do_trickle_setup(ds1307, ohms, diode);
 }
 
 /*----------------------------------------------------------------------*/
@@ -995,7 +1040,7 @@ static int ds3231_hwmon_read_temp(struct device *dev, s32 *mC)
 }
 
 static ssize_t ds3231_hwmon_show_temp(struct device *dev,
-				struct device_attribute *attr, char *buf)
+				      struct device_attribute *attr, char *buf)
 {
 	int ret;
 	s32 temp;
@@ -1006,8 +1051,8 @@ static ssize_t ds3231_hwmon_show_temp(struct device *dev,
 
 	return sprintf(buf, "%d\n", temp);
 }
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ds3231_hwmon_show_temp,
-			NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_input, 0444, ds3231_hwmon_show_temp,
+			  NULL, 0);
 
 static struct attribute *ds3231_hwmon_attrs[] = {
 	&sensor_dev_attr_temp1_input.dev_attr.attr,
@@ -1023,7 +1068,8 @@ static void ds1307_hwmon_register(struct ds1307 *ds1307)
 		return;
 
 	dev = devm_hwmon_device_register_with_groups(ds1307->dev, ds1307->name,
-						ds1307, ds3231_hwmon_groups);
+						     ds1307,
+						     ds3231_hwmon_groups);
 	if (IS_ERR(dev)) {
 		dev_warn(ds1307->dev, "unable to register hwmon device %ld\n",
 			 PTR_ERR(dev));
@@ -1095,7 +1141,7 @@ static unsigned long ds3231_clk_sqw_recalc_rate(struct clk_hw *hw,
 }
 
 static long ds3231_clk_sqw_round_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long *prate)
+				      unsigned long *prate)
 {
 	int i;
 
@@ -1108,7 +1154,7 @@ static long ds3231_clk_sqw_round_rate(struct clk_hw *hw, unsigned long rate,
 }
 
 static int ds3231_clk_sqw_set_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long parent_rate)
+				   unsigned long parent_rate)
 {
 	struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
 	int control = 0;
@@ -1168,7 +1214,7 @@ static const struct clk_ops ds3231_clk_sqw_ops = {
 };
 
 static unsigned long ds3231_clk_32khz_recalc_rate(struct clk_hw *hw,
-						unsigned long parent_rate)
+						  unsigned long parent_rate)
 {
 	return 32768;
 }
@@ -1259,7 +1305,7 @@ static int ds3231_clks_register(struct ds1307 *ds1307)
 
 		/* optional override of the clockname */
 		of_property_read_string_index(node, "clock-output-names", i,
-						&init.name);
+					      &init.name);
 		ds1307->clks[i].init = &init;
 
 		onecell->clks[i] = devm_clk_register(ds1307->dev,
@@ -1309,22 +1355,14 @@ static int ds1307_probe(struct i2c_client *client,
 	struct ds1307		*ds1307;
 	int			err = -ENODEV;
 	int			tmp, wday;
-	struct chip_desc	*chip;
-	bool			want_irq = false;
+	const struct chip_desc	*chip;
+	bool			want_irq;
 	bool			ds1307_can_wakeup_device = false;
-	unsigned char		*buf;
+	unsigned char		regs[8];
 	struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct rtc_time		tm;
 	unsigned long		timestamp;
-
-	irq_handler_t	irq_handler = ds1307_irq;
-
-	static const int	bbsqi_bitpos[] = {
-		[ds_1337] = 0,
-		[ds_1339] = DS1339_BIT_BBSQI,
-		[ds_3231] = DS3231_BIT_BBSQW,
-	};
-	const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops;
+	u8			trickle_charger_setup = 0;
 
 	ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL);
 	if (!ds1307)
@@ -1333,7 +1371,6 @@ static int ds1307_probe(struct i2c_client *client,
 	dev_set_drvdata(&client->dev, ds1307);
 	ds1307->dev = &client->dev;
 	ds1307->name = client->name;
-	ds1307->irq = client->irq;
 
 	ds1307->regmap = devm_regmap_init_i2c(client, &regmap_config);
 	if (IS_ERR(ds1307->regmap)) {
@@ -1361,23 +1398,22 @@ static int ds1307_probe(struct i2c_client *client,
 		ds1307->type = acpi_id->driver_data;
 	}
 
+	want_irq = client->irq > 0 && chip->alarm;
+
 	if (!pdata)
-		ds1307_trickle_init(ds1307, chip);
+		trickle_charger_setup = ds1307_trickle_init(ds1307, chip);
 	else if (pdata->trickle_charger_setup)
-		chip->trickle_charger_setup = pdata->trickle_charger_setup;
+		trickle_charger_setup = pdata->trickle_charger_setup;
 
-	if (chip->trickle_charger_setup && chip->trickle_charger_reg) {
+	if (trickle_charger_setup && chip->trickle_charger_reg) {
+		trickle_charger_setup |= DS13XX_TRICKLE_CHARGER_MAGIC;
 		dev_dbg(ds1307->dev,
 			"writing trickle charger info 0x%x to 0x%x\n",
-		    DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup,
-		    chip->trickle_charger_reg);
+			trickle_charger_setup, chip->trickle_charger_reg);
 		regmap_write(ds1307->regmap, chip->trickle_charger_reg,
-		    DS13XX_TRICKLE_CHARGER_MAGIC |
-		    chip->trickle_charger_setup);
+			     trickle_charger_setup);
 	}
 
-	buf = ds1307->regs;
-
 #ifdef CONFIG_OF
 /*
  * For devices with no IRQ directly connected to the SoC, the RTC chip
@@ -1387,31 +1423,27 @@ static int ds1307_probe(struct i2c_client *client,
  * This will guarantee the 'wakealarm' sysfs entry is available on the device,
  * if supported by the RTC.
  */
-	if (of_property_read_bool(client->dev.of_node, "wakeup-source")) {
-		ds1307_can_wakeup_device = true;
-	}
-	/* Intersil ISL12057 DT backward compatibility */
-	if (of_property_read_bool(client->dev.of_node,
-				  "isil,irq2-can-wakeup-machine")) {
+	if (chip->alarm && of_property_read_bool(client->dev.of_node,
+						 "wakeup-source"))
 		ds1307_can_wakeup_device = true;
-	}
 #endif
 
 	switch (ds1307->type) {
 	case ds_1337:
 	case ds_1339:
+	case ds_1341:
 	case ds_3231:
 		/* get registers that the "rtc" read below won't read... */
 		err = regmap_bulk_read(ds1307->regmap, DS1337_REG_CONTROL,
-				       buf, 2);
+				       regs, 2);
 		if (err) {
 			dev_dbg(ds1307->dev, "read error %d\n", err);
 			goto exit;
 		}
 
 		/* oscillator off?  turn it on, so clock can tick. */
-		if (ds1307->regs[0] & DS1337_BIT_nEOSC)
-			ds1307->regs[0] &= ~DS1337_BIT_nEOSC;
+		if (regs[0] & DS1337_BIT_nEOSC)
+			regs[0] &= ~DS1337_BIT_nEOSC;
 
 		/*
 		 * Using IRQ or defined as wakeup-source?
@@ -1419,114 +1451,92 @@ static int ds1307_probe(struct i2c_client *client,
 		 * For some variants, be sure alarms can trigger when we're
 		 * running on Vbackup (BBSQI/BBSQW)
 		 */
-		if (chip->alarm && (ds1307->irq > 0 ||
-				    ds1307_can_wakeup_device)) {
-			ds1307->regs[0] |= DS1337_BIT_INTCN
-					| bbsqi_bitpos[ds1307->type];
-			ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
-
-			want_irq = true;
+		if (want_irq || ds1307_can_wakeup_device) {
+			regs[0] |= DS1337_BIT_INTCN | chip->bbsqi_bit;
+			regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
 		}
 
 		regmap_write(ds1307->regmap, DS1337_REG_CONTROL,
-			     ds1307->regs[0]);
+			     regs[0]);
 
 		/* oscillator fault?  clear flag, and warn */
-		if (ds1307->regs[1] & DS1337_BIT_OSF) {
+		if (regs[1] & DS1337_BIT_OSF) {
 			regmap_write(ds1307->regmap, DS1337_REG_STATUS,
-				     ds1307->regs[1] & ~DS1337_BIT_OSF);
+				     regs[1] & ~DS1337_BIT_OSF);
 			dev_warn(ds1307->dev, "SET TIME!\n");
 		}
 		break;
 
 	case rx_8025:
 		err = regmap_bulk_read(ds1307->regmap,
-				       RX8025_REG_CTRL1 << 4 | 0x08, buf, 2);
+				       RX8025_REG_CTRL1 << 4 | 0x08, regs, 2);
 		if (err) {
 			dev_dbg(ds1307->dev, "read error %d\n", err);
 			goto exit;
 		}
 
 		/* oscillator off?  turn it on, so clock can tick. */
-		if (!(ds1307->regs[1] & RX8025_BIT_XST)) {
-			ds1307->regs[1] |= RX8025_BIT_XST;
+		if (!(regs[1] & RX8025_BIT_XST)) {
+			regs[1] |= RX8025_BIT_XST;
 			regmap_write(ds1307->regmap,
 				     RX8025_REG_CTRL2 << 4 | 0x08,
-				     ds1307->regs[1]);
+				     regs[1]);
 			dev_warn(ds1307->dev,
 				 "oscillator stop detected - SET TIME!\n");
 		}
 
-		if (ds1307->regs[1] & RX8025_BIT_PON) {
-			ds1307->regs[1] &= ~RX8025_BIT_PON;
+		if (regs[1] & RX8025_BIT_PON) {
+			regs[1] &= ~RX8025_BIT_PON;
 			regmap_write(ds1307->regmap,
 				     RX8025_REG_CTRL2 << 4 | 0x08,
-				     ds1307->regs[1]);
+				     regs[1]);
 			dev_warn(ds1307->dev, "power-on detected\n");
 		}
 
-		if (ds1307->regs[1] & RX8025_BIT_VDET) {
-			ds1307->regs[1] &= ~RX8025_BIT_VDET;
+		if (regs[1] & RX8025_BIT_VDET) {
+			regs[1] &= ~RX8025_BIT_VDET;
 			regmap_write(ds1307->regmap,
 				     RX8025_REG_CTRL2 << 4 | 0x08,
-				     ds1307->regs[1]);
+				     regs[1]);
 			dev_warn(ds1307->dev, "voltage drop detected\n");
 		}
 
 		/* make sure we are running in 24hour mode */
-		if (!(ds1307->regs[0] & RX8025_BIT_2412)) {
+		if (!(regs[0] & RX8025_BIT_2412)) {
 			u8 hour;
 
 			/* switch to 24 hour mode */
 			regmap_write(ds1307->regmap,
 				     RX8025_REG_CTRL1 << 4 | 0x08,
-				     ds1307->regs[0] | RX8025_BIT_2412);
+				     regs[0] | RX8025_BIT_2412);
 
 			err = regmap_bulk_read(ds1307->regmap,
 					       RX8025_REG_CTRL1 << 4 | 0x08,
-					       buf, 2);
+					       regs, 2);
 			if (err) {
 				dev_dbg(ds1307->dev, "read error %d\n", err);
 				goto exit;
 			}
 
 			/* correct hour */
-			hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]);
+			hour = bcd2bin(regs[DS1307_REG_HOUR]);
 			if (hour == 12)
 				hour = 0;
-			if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
+			if (regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
 				hour += 12;
 
 			regmap_write(ds1307->regmap,
 				     DS1307_REG_HOUR << 4 | 0x08, hour);
 		}
 		break;
-	case rx_8130:
-		ds1307->offset = 0x10; /* Seconds starts at 0x10 */
-		rtc_ops = &rx8130_rtc_ops;
-		if (chip->alarm && ds1307->irq > 0) {
-			irq_handler = rx8130_irq;
-			want_irq = true;
-		}
-		break;
-	case ds_1388:
-		ds1307->offset = 1; /* Seconds starts at 1 */
-		break;
-	case mcp794xx:
-		rtc_ops = &mcp794xx_rtc_ops;
-		if (chip->alarm && (ds1307->irq > 0 ||
-				    ds1307_can_wakeup_device)) {
-			irq_handler = mcp794xx_irq;
-			want_irq = true;
-		}
-		break;
 	default:
 		break;
 	}
 
 read_rtc:
 	/* read RTC registers */
-	err = regmap_bulk_read(ds1307->regmap, ds1307->offset, buf, 8);
+	err = regmap_bulk_read(ds1307->regmap, chip->offset, regs,
+			       sizeof(regs));
 	if (err) {
 		dev_dbg(ds1307->dev, "read error %d\n", err);
 		goto exit;
@@ -1537,7 +1547,7 @@ read_rtc:
 	 * specify the extra bits as must-be-zero, but there are
 	 * still a few values that are clearly out-of-range.
 	 */
-	tmp = ds1307->regs[DS1307_REG_SECS];
+	tmp = regs[DS1307_REG_SECS];
 	switch (ds1307->type) {
 	case ds_1307:
 	case m41t0:
@@ -1556,10 +1566,10 @@ read_rtc:
 			regmap_write(ds1307->regmap, DS1307_REG_SECS, 0);
 
 		/* oscillator fault?  clear flag, and warn */
-		if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
+		if (regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
 			regmap_write(ds1307->regmap, DS1307_REG_CONTROL,
-					ds1307->regs[DS1307_REG_CONTROL] &
-					~DS1338_BIT_OSF);
+				     regs[DS1307_REG_CONTROL] &
+				     ~DS1338_BIT_OSF);
 			dev_warn(ds1307->dev, "SET TIME!\n");
 			goto read_rtc;
 		}
@@ -1583,9 +1593,9 @@ read_rtc:
 		break;
 	case mcp794xx:
 		/* make sure that the backup battery is enabled */
-		if (!(ds1307->regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) {
+		if (!(regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) {
 			regmap_write(ds1307->regmap, DS1307_REG_WDAY,
-				     ds1307->regs[DS1307_REG_WDAY] |
+				     regs[DS1307_REG_WDAY] |
 				     MCP794XX_BIT_VBATEN);
 		}
 
@@ -1602,7 +1612,7 @@ read_rtc:
 		break;
 	}
 
-	tmp = ds1307->regs[DS1307_REG_HOUR];
+	tmp = regs[DS1307_REG_HOUR];
 	switch (ds1307->type) {
 	case ds_1340:
 	case m41t0:
@@ -1625,9 +1635,9 @@ read_rtc:
 		tmp = bcd2bin(tmp & 0x1f);
 		if (tmp == 12)
 			tmp = 0;
-		if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
+		if (regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
 			tmp += 12;
-		regmap_write(ds1307->regmap, ds1307->offset + DS1307_REG_HOUR,
+		regmap_write(ds1307->regmap, chip->offset + DS1307_REG_HOUR,
 			     bin2bcd(tmp));
 	}
 
@@ -1650,19 +1660,16 @@ read_rtc:
 				   MCP794XX_REG_WEEKDAY_WDAY_MASK,
 				   tm.tm_wday + 1);
 
-	if (want_irq) {
+	if (want_irq || ds1307_can_wakeup_device) {
 		device_set_wakeup_capable(ds1307->dev, true);
 		set_bit(HAS_ALARM, &ds1307->flags);
 	}
 
 	ds1307->rtc = devm_rtc_allocate_device(ds1307->dev);
-	if (IS_ERR(ds1307->rtc)) {
+	if (IS_ERR(ds1307->rtc))
 		return PTR_ERR(ds1307->rtc);
-	}
 
-	if (ds1307_can_wakeup_device && ds1307->irq <= 0) {
-		/* Disable request for an IRQ */
-		want_irq = false;
+	if (ds1307_can_wakeup_device && !want_irq) {
 		dev_info(ds1307->dev,
 			 "'wakeup-source' is set, request for an IRQ is disabled!\n");
 		/* We cannot support UIE mode if we do not have an IRQ line */
@@ -1670,8 +1677,8 @@ read_rtc:
 	}
 
 	if (want_irq) {
-		err = devm_request_threaded_irq(ds1307->dev,
-						ds1307->irq, NULL, irq_handler,
+		err = devm_request_threaded_irq(ds1307->dev, client->irq, NULL,
+						chip->irq_handler ?: ds1307_irq,
 						IRQF_SHARED | IRQF_ONESHOT,
 						ds1307->name, ds1307);
 		if (err) {
@@ -1679,8 +1686,9 @@ read_rtc:
 			device_set_wakeup_capable(ds1307->dev, false);
 			clear_bit(HAS_ALARM, &ds1307->flags);
 			dev_err(ds1307->dev, "unable to request IRQ!\n");
-		} else
+		} else {
 			dev_dbg(ds1307->dev, "got IRQ %d\n", client->irq);
+		}
 	}
 
 	if (chip->nvram_size) {
@@ -1691,13 +1699,12 @@ read_rtc:
 		ds1307->nvmem_cfg.reg_read = ds1307_nvram_read;
 		ds1307->nvmem_cfg.reg_write = ds1307_nvram_write;
 		ds1307->nvmem_cfg.priv = ds1307;
-		ds1307->nvram_offset = chip->nvram_offset;
 
 		ds1307->rtc->nvmem_config = &ds1307->nvmem_cfg;
 		ds1307->rtc->nvram_old_abi = true;
 	}
 
-	ds1307->rtc->ops = rtc_ops;
+	ds1307->rtc->ops = chip->rtc_ops ?: &ds13xx_rtc_ops;
 	err = rtc_register_device(ds1307->rtc);
 	if (err)
 		return err;