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>
diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index 7f1ca10..28330e8 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -370,7 +370,7 @@
 			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 @@
 			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 @@
 		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,