rtc: rv3029: remove open coded regmap_update_bits

rv3029_update_bits open codes regmap_update_bits and forgets to properly
lock the register range while doing so. Use regmap_update_bits instead.

Link: https://lore.kernel.org/r/20191214221022.622482-4-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-rv3029c2.c

@@ -137,23 +137,6 @@ static int rv3029_write_regs(struct device *dev, u8 reg, u8 const buf[],
 	return regmap_bulk_write(rv3029->regmap, reg, buf, len);
 }
 
-static int rv3029_update_bits(struct device *dev, u8 reg, u8 mask, u8 set)
-{
-	u8 buf;
-	int ret;
-
-	ret = rv3029_read_regs(dev, reg, &buf, 1);
-	if (ret < 0)
-		return ret;
-	buf &= ~mask;
-	buf |= set & mask;
-	ret = rv3029_write_regs(dev, reg, &buf, 1);
-	if (ret < 0)
-		return ret;
-
-	return 0;
-}
-
 static int rv3029_get_sr(struct device *dev, u8 *buf)
 {
 	int ret = rv3029_read_regs(dev, RV3029_STATUS, buf, 1);
@@ -200,14 +183,17 @@ static int rv3029_eeprom_busywait(struct device *dev)
 
 static int rv3029_eeprom_exit(struct device *dev)
 {
+	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
+
 	/* Re-enable eeprom refresh */
-	return rv3029_update_bits(dev, RV3029_ONOFF_CTRL,
+	return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
 				  RV3029_ONOFF_CTRL_EERE,
 				  RV3029_ONOFF_CTRL_EERE);
 }
 
 static int rv3029_eeprom_enter(struct device *dev)
 {
+	struct rv3029_data *rv3029 = dev_get_drvdata(dev);
 	int ret;
 	u8 sr;
 
@@ -236,8 +222,8 @@ static int rv3029_eeprom_enter(struct device *dev)
 	}
 
 	/* Disable eeprom refresh. */
-	ret = rv3029_update_bits(dev, RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE,
-				 0);
+	ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
+				 RV3029_ONOFF_CTRL_EERE, 0);
 	if (ret < 0)
 		return ret;