Simplify the code by using devm_regulator_get_enable_read_voltage().

Signed-off-by: David Lechner <dlechner@baylibre.com>
---
 drivers/iio/dac/ad5624r.h     |  1 -
 drivers/iio/dac/ad5624r_spi.c | 62 +++++++++----------------------------------
 2 files changed, 13 insertions(+), 50 deletions(-)

diff --git a/drivers/iio/dac/ad5624r.h b/drivers/iio/dac/ad5624r.h
index 13964f3a22a4..14a439b06eb6 100644
--- a/drivers/iio/dac/ad5624r.h
+++ b/drivers/iio/dac/ad5624r.h
@@ -54,7 +54,6 @@ struct ad5624r_chip_info {
 struct ad5624r_state {
 	struct spi_device		*us;
 	const struct ad5624r_chip_info	*chip_info;
-	struct regulator		*reg;
 	unsigned short			vref_mv;
 	unsigned			pwr_down_mask;
 	unsigned			pwr_down_mode;
diff --git a/drivers/iio/dac/ad5624r_spi.c b/drivers/iio/dac/ad5624r_spi.c
index 9304d0499bae..5a952b45f488 100644
--- a/drivers/iio/dac/ad5624r_spi.c
+++ b/drivers/iio/dac/ad5624r_spi.c
@@ -223,50 +223,27 @@ static int ad5624r_probe(struct spi_device *spi)
 {
 	struct ad5624r_state *st;
 	struct iio_dev *indio_dev;
-	int ret, voltage_uv = 0;
+	bool external_vref;
+	int ret;
 
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (!indio_dev)
 		return -ENOMEM;
 	st = iio_priv(indio_dev);
-	st->reg = devm_regulator_get_optional(&spi->dev, "vref");
-	if (!IS_ERR(st->reg)) {
-		ret = regulator_enable(st->reg);
-		if (ret)
-			return ret;
-
-		ret = regulator_get_voltage(st->reg);
-		if (ret < 0)
-			goto error_disable_reg;
-
-		voltage_uv = ret;
-	} else {
-		if (PTR_ERR(st->reg) != -ENODEV)
-			return PTR_ERR(st->reg);
+	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");
+	if (ret == -ENODEV)
 		/* Backwards compatibility. This naming is not correct */
-		st->reg = devm_regulator_get_optional(&spi->dev, "vcc");
-		if (!IS_ERR(st->reg)) {
-			ret = regulator_enable(st->reg);
-			if (ret)
-				return ret;
-
-			ret = regulator_get_voltage(st->reg);
-			if (ret < 0)
-				goto error_disable_reg;
-
-			voltage_uv = ret;
-		}
-	}
+		ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vcc");
+	if (ret < 0 && ret != -ENODEV)
+		return ret;
+
+	external_vref = ret != -ENODEV;
+	st->vref_mv = external_vref ? ret / 1000 : st->chip_info->int_vref_mv;
 
 	spi_set_drvdata(spi, indio_dev);
 	st->chip_info =
 		&ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
 
-	if (voltage_uv)
-		st->vref_mv = voltage_uv / 1000;
-	else
-		st->vref_mv = st->chip_info->int_vref_mv;
-
 	st->us = spi;
 
 	indio_dev->name = spi_get_device_id(spi)->name;
@@ -276,31 +253,18 @@ static int ad5624r_probe(struct spi_device *spi)
 	indio_dev->num_channels = AD5624R_DAC_CHANNELS;
 
 	ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
-				!!voltage_uv, 16);
+				external_vref, 16);
 	if (ret)
-		goto error_disable_reg;
-
-	ret = iio_device_register(indio_dev);
-	if (ret)
-		goto error_disable_reg;
-
-	return 0;
-
-error_disable_reg:
-	if (!IS_ERR(st->reg))
-		regulator_disable(st->reg);
+		return ret;
 
-	return ret;
+	return iio_device_register(indio_dev);
 }
 
 static void ad5624r_remove(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev = spi_get_drvdata(spi);
-	struct ad5624r_state *st = iio_priv(indio_dev);
 
 	iio_device_unregister(indio_dev);
-	if (!IS_ERR(st->reg))
-		regulator_disable(st->reg);
 }
 
 static const struct spi_device_id ad5624r_id[] = {

-- 
2.43.0