Use devm_regulator_get_enable_read_voltage function as a standard and
concise way of reading the voltage from the regulator and keep the
regulator enabled. Replace the regulator descriptor with the direct
voltage value in the device struct.

Signed-off-by: Jonathan Santos <redacted>
---
 drivers/iio/adc/ad7768-1.c | 29 +++++++----------------------
 1 file changed, 7 insertions(+), 22 deletions(-)

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index 36ba208fc119..d0b9764a8f92 100644
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c

@@ -225,7 +225,7 @@ struct ad7768_state {
 	struct spi_device *spi;
 	struct regmap *regmap;
 	struct regmap *regmap24;
-	struct regulator *vref;
+	int vref_uv;
 	struct regulator_dev *vcm_rdev;
 	unsigned int vcm_output_sel;
 	struct clk *mclk;

@@ -809,7 +809,7 @@ static int ad7768_read_raw(struct iio_dev *indio_dev,
 		return IIO_VAL_INT;
 
 	case IIO_CHAN_INFO_SCALE:
-		scale_uv = regulator_get_voltage(st->vref);
+		scale_uv = st->vref_uv;
 		if (scale_uv < 0)
 			return scale_uv;