rtc: ds1307: use regmap_update_bits where applicable

After the switch to regmap we can now make use of regmap_update_bits
to simplify read/modify/write ops.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-ds1307.c

@@ -297,7 +297,7 @@ static irqreturn_t ds1307_irq(int irq, void *dev_id)
 {
 	struct ds1307		*ds1307 = dev_id;
 	struct mutex		*lock = &ds1307->rtc->ops_lock;
-	int			stat, control, ret;
+	int			stat, ret;
 
 	mutex_lock(lock);
 	ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &stat);
@@ -308,13 +308,11 @@ static irqreturn_t ds1307_irq(int irq, void *dev_id)
 		stat &= ~DS1337_BIT_A1I;
 		regmap_write(ds1307->regmap, DS1337_REG_STATUS, stat);
 
-		ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control);
+		ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+					 DS1337_BIT_A1IE, 0);
 		if (ret)
 			goto out;
 
-		control &= ~DS1337_BIT_A1IE;
-		regmap_write(ds1307->regmap, DS1337_REG_CONTROL, control);
-
 		rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
 	}
 
@@ -567,21 +565,13 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct ds1307		*ds1307 = dev_get_drvdata(dev);
-	int			control, ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -ENOTTY;
 
-	ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control);
-	if (ret)
-		return ret;
-
-	if (enabled)
-		control |= DS1337_BIT_A1IE;
-	else
-		control &= ~DS1337_BIT_A1IE;
-
-	return regmap_write(ds1307->regmap, DS1337_REG_CONTROL, control);
+	return regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+				  DS1337_BIT_A1IE,
+				  enabled ? DS1337_BIT_A1IE : 0);
 }
 
 static const struct rtc_class_ops ds13xx_rtc_ops = {
@@ -795,11 +785,8 @@ static irqreturn_t mcp794xx_irq(int irq, void *dev_id)
 		goto out;
 
 	/* Disable alarm 0. */
-	ret = regmap_read(ds1307->regmap, MCP794XX_REG_CONTROL, &reg);
-	if (ret)
-		goto out;
-	reg &= ~MCP794XX_BIT_ALM0_EN;
-	ret = regmap_write(ds1307->regmap, MCP794XX_REG_CONTROL, reg);
+	ret = regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL,
+				 MCP794XX_BIT_ALM0_EN, 0);
 	if (ret)
 		goto out;
 
@@ -897,21 +884,13 @@ static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct ds1307 *ds1307 = dev_get_drvdata(dev);
-	int reg, ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
-	ret = regmap_read(ds1307->regmap, MCP794XX_REG_CONTROL, &reg);
-	if (ret)
-		return ret;
-
-	if (enabled)
-		reg |= MCP794XX_BIT_ALM0_EN;
-	else
-		reg &= ~MCP794XX_BIT_ALM0_EN;
-
-	return regmap_write(ds1307->regmap, MCP794XX_REG_CONTROL, reg);
+	return regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL,
+				  MCP794XX_BIT_ALM0_EN,
+				  enabled ? MCP794XX_BIT_ALM0_EN : 0);
 }
 
 static const struct rtc_class_ops mcp794xx_rtc_ops = {
@@ -1114,20 +1093,11 @@ static int ds3231_clk_sqw_rates[] = {
 static int ds1337_write_control(struct ds1307 *ds1307, u8 mask, u8 value)
 {
 	struct mutex *lock = &ds1307->rtc->ops_lock;
-	int control;
 	int ret;
 
 	mutex_lock(lock);
-
-	ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control);
-	if (ret)
-		goto out;
-
-	control &= ~mask;
-	control |= value;
-
-	ret = regmap_write(ds1307->regmap, DS1337_REG_CONTROL, control);
-out:
+	ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+				 mask, value);
 	mutex_unlock(lock);
 
 	return ret;
@@ -1233,22 +1203,12 @@ static unsigned long ds3231_clk_32khz_recalc_rate(struct clk_hw *hw,
 static int ds3231_clk_32khz_control(struct ds1307 *ds1307, bool enable)
 {
 	struct mutex *lock = &ds1307->rtc->ops_lock;
-	int status;
 	int ret;
 
 	mutex_lock(lock);
-
-	ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &status);
-	if (ret)
-		goto out;
-
-	if (enable)
-		status |= DS3231_BIT_EN32KHZ;
-	else
-		status &= ~DS3231_BIT_EN32KHZ;
-
-	ret = regmap_write(ds1307->regmap, DS1337_REG_STATUS, status);
-out:
+	ret = regmap_update_bits(ds1307->regmap, DS1337_REG_STATUS,
+				 DS3231_BIT_EN32KHZ,
+				 enable ? DS3231_BIT_EN32KHZ : 0);
 	mutex_unlock(lock);
 
 	return ret;
@@ -1712,12 +1672,10 @@ static int ds1307_probe(struct i2c_client *client,
 	 * If different then set the wday which we computed using
 	 * timestamp
 	 */
-	if (wday != tm.tm_wday) {
-		regmap_read(ds1307->regmap, MCP794XX_REG_WEEKDAY, &wday);
-		wday = wday & ~MCP794XX_REG_WEEKDAY_WDAY_MASK;
-		wday = wday | (tm.tm_wday + 1);
-		regmap_write(ds1307->regmap, MCP794XX_REG_WEEKDAY, wday);
-	}
+	if (wday != tm.tm_wday)
+		regmap_update_bits(ds1307->regmap, MCP794XX_REG_WEEKDAY,
+				   MCP794XX_REG_WEEKDAY_WDAY_MASK,
+				   tm.tm_wday + 1);
 
 	if (want_irq) {
 		device_set_wakeup_capable(ds1307->dev, true);