regulator: anatop: Remove checking control_reg in [set|get]_voltage_sel

Remove checking control_reg in [set|get]_voltage_sel and then convert to use
regulator_[set|get]_voltage_sel_regmap for [set|get]_voltage_sel callbacks.

The anatop-reg-offset property is a required property rather than optional
property. So the question is what is the meaning of setting anatop-reg-offset
to 0? If 0 is a valid setting for anatop-reg-offset and it has special meaning,
we had better document it in the binding document. Otherwise, remove the testing
for control_reg in the driver.

No anatop voltage regulator node in the dts files set anatop-reg-offset to 0.
So I think it's safe to remove testing if control_reg is 0.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/anatop-regulator.c

@@ -55,17 +55,6 @@ struct anatop_regulator {
 	int sel;
 };
 
-static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
-					unsigned selector)
-{
-	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
-
-	if (!anatop_reg->control_reg)
-		return -ENOTSUPP;
-
-	return regulator_set_voltage_sel_regmap(reg, selector);
-}
-
 static int anatop_regmap_set_voltage_time_sel(struct regulator_dev *reg,
 	unsigned int old_sel,
 	unsigned int new_sel)
@@ -92,16 +81,6 @@ static int anatop_regmap_set_voltage_time_sel(struct regulator_dev *reg,
 	return ret;
 }
 
-static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
-{
-	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
-
-	if (!anatop_reg->control_reg)
-		return -ENOTSUPP;
-
-	return regulator_get_voltage_sel_regmap(reg);
-}
-
 static int anatop_regmap_enable(struct regulator_dev *reg)
 {
 	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
@@ -178,8 +157,8 @@ static int anatop_regmap_set_bypass(struct regulator_dev *reg, bool enable)
 }
 
 static struct regulator_ops anatop_rops = {
-	.set_voltage_sel = anatop_regmap_set_voltage_sel,
-	.get_voltage_sel = anatop_regmap_get_voltage_sel,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.list_voltage = regulator_list_voltage_linear,
 	.map_voltage = regulator_map_voltage_linear,
 };