On Mon, Nov 23, 2020 at 11:48:07AM +0800, Hsin-Hsiung Wang wrote:

+static int mt6359_get_linear_voltage_sel(struct regulator_dev *rdev)
+{
+	struct mt6359_regulator_info *info = rdev_get_drvdata(rdev);
+	int ret, regval;
+
+	ret = regmap_read(rdev->regmap, info->da_vsel_reg, &regval);
+	if (ret != 0) {
+		dev_err(&rdev->dev,
+			"Failed to get mt6359 Buck %s vsel reg: %d\n",
+			info->desc.name, ret);
+		return ret;
+	}
+
+	ret = (regval >> info->da_vsel_shift) & info->da_vsel_mask;
+
+	return ret;
+}

This looks like it could just be regmap_get_voltage_sel_regmap()?
Otherwise the driver looks good.