rtc: max77686: use rtc regmap to access RTC registers

rtc_regmap should be used to access all RTC registers instead
of parent regmap regardless of what chip or property have it.

This makes the register access uniform and extendible for other
chips.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-max77686.c

@@ -370,7 +370,7 @@ static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 			goto out;
 		}
 
-		ret = regmap_read(info->max77686->regmap,
+		ret = regmap_read(info->max77686->rtc_regmap,
 				  map[REG_RTC_AE1], &val);
 		if (ret < 0) {
 			dev_err(info->dev,
@@ -426,7 +426,8 @@ static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
 			goto out;
 		}
 
-		ret = regmap_write(info->max77686->regmap, map[REG_RTC_AE1], 0);
+		ret = regmap_write(info->max77686->rtc_regmap,
+				   map[REG_RTC_AE1], 0);
 	} else {
 		ret = regmap_bulk_read(info->max77686->rtc_regmap,
 				       map[REG_ALARM1_SEC], data,
@@ -471,7 +472,7 @@ static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
 		goto out;
 
 	if (info->drv_data->alarm_enable_reg) {
-		ret = regmap_write(info->max77686->regmap, map[REG_RTC_AE1],
+		ret = regmap_write(info->max77686->rtc_regmap, map[REG_RTC_AE1],
 				   MAX77802_ALARM_ENABLE_VALUE);
 	} else {
 		ret = regmap_bulk_read(info->max77686->rtc_regmap,