Re: [PATCH v2 2/5] iio: adc: ad7380: use devm_regulator_get_enable_read_voltage()

From: Nuno Sá
Date: Mon Oct 21 2024 - 07:05:12 EST


On Mon, 2024-10-21 at 12:00 +0200, Julien Stephan wrote:
> Use devm_regulator_get_enable_read_voltage() to simplify the code.
>
> Signed-off-by: Julien Stephan <jstephan@xxxxxxxxxxxx>
> ---

LGTM,

Reviewed-by: Nuno Sa <nuno.sa@xxxxxxxxxx>

>  drivers/iio/adc/ad7380.c | 81 +++++++++++++----------------------------------
> -
>  1 file changed, 21 insertions(+), 60 deletions(-)
>
> diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c
> index
> e8bddfb0d07dbcf3e2a43344a4e0516f4d617548..e033c734191143a25a490b09c730dbf95f79
> 6737 100644
> --- a/drivers/iio/adc/ad7380.c
> +++ b/drivers/iio/adc/ad7380.c
> @@ -956,7 +956,7 @@ static const struct iio_info ad7380_info = {
>   .debugfs_reg_access = &ad7380_debugfs_reg_access,
>  };
>  
> -static int ad7380_init(struct ad7380_state *st, struct regulator *vref)
> +static int ad7380_init(struct ad7380_state *st, bool external_ref_en)
>  {
>   int ret;
>  
> @@ -968,13 +968,13 @@ static int ad7380_init(struct ad7380_state *st, struct
> regulator *vref)
>   if (ret < 0)
>   return ret;
>  
> - /* select internal or external reference voltage */
> - ret = regmap_update_bits(st->regmap, AD7380_REG_ADDR_CONFIG1,
> - AD7380_CONFIG1_REFSEL,
> - FIELD_PREP(AD7380_CONFIG1_REFSEL,
> -     vref ? 1 : 0));
> - if (ret < 0)
> - return ret;
> + if (external_ref_en) {
> + /* select external reference voltage */
> + ret = regmap_set_bits(st->regmap, AD7380_REG_ADDR_CONFIG1,
> +       AD7380_CONFIG1_REFSEL);
> + if (ret < 0)
> + return ret;
> + }
>  
>   /* This is the default value after reset. */
>   st->oversampling_ratio = 1;
> @@ -987,16 +987,11 @@ static int ad7380_init(struct ad7380_state *st, struct
> regulator *vref)
>     FIELD_PREP(AD7380_CONFIG2_SDO, 1));
>  }
>  
> -static void ad7380_regulator_disable(void *p)
> -{
> - regulator_disable(p);
> -}
> -
>  static int ad7380_probe(struct spi_device *spi)
>  {
>   struct iio_dev *indio_dev;
>   struct ad7380_state *st;
> - struct regulator *vref;
> + bool external_ref_en;
>   int ret, i;
>  
>   indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> @@ -1009,37 +1004,17 @@ static int ad7380_probe(struct spi_device *spi)
>   if (!st->chip_info)
>   return dev_err_probe(&spi->dev, -EINVAL, "missing match
> data\n");
>  
> - vref = devm_regulator_get_optional(&spi->dev, "refio");
> - if (IS_ERR(vref)) {
> - if (PTR_ERR(vref) != -ENODEV)
> - return dev_err_probe(&spi->dev, PTR_ERR(vref),
> -      "Failed to get refio
> regulator\n");
> -
> - vref = NULL;
> - }
> -
>   /*
>   * If there is no REFIO supply, then it means that we are using
>   * the internal 2.5V reference, otherwise REFIO is reference voltage.
>   */
> - if (vref) {
> - ret = regulator_enable(vref);
> - if (ret)
> - return ret;
> + ret = devm_regulator_get_enable_read_voltage(&spi->dev, "refio");
> + if (ret < 0 && ret != -ENODEV)
> + return dev_err_probe(&spi->dev, ret,
> +      "Failed to get refio regulator\n");
>  
> - ret = devm_add_action_or_reset(&spi->dev,
> -        ad7380_regulator_disable,
> vref);
> - if (ret)
> - return ret;
> -
> - ret = regulator_get_voltage(vref);
> - if (ret < 0)
> - return ret;
> -
> - st->vref_mv = ret / 1000;
> - } else {
> - st->vref_mv = AD7380_INTERNAL_REF_MV;
> - }
> + external_ref_en = ret != -ENODEV;
> + st->vref_mv = external_ref_en ? ret / 1000 : AD7380_INTERNAL_REF_MV;
>  
>   if (st->chip_info->num_vcm_supplies > ARRAY_SIZE(st->vcm_mv))
>   return dev_err_probe(&spi->dev, -EINVAL,
> @@ -1050,27 +1025,13 @@ static int ad7380_probe(struct spi_device *spi)
>   * input pin.
>   */
>   for (i = 0; i < st->chip_info->num_vcm_supplies; i++) {
> - struct regulator *vcm;
> -
> - vcm = devm_regulator_get(&spi->dev,
> - st->chip_info->vcm_supplies[i]);
> - if (IS_ERR(vcm))
> - return dev_err_probe(&spi->dev, PTR_ERR(vcm),
> -      "Failed to get %s regulator\n",
> -      st->chip_info->vcm_supplies[i]);
> + const char *vcm = st->chip_info->vcm_supplies[i];
>  
> - ret = regulator_enable(vcm);
> - if (ret)
> - return ret;
> -
> - ret = devm_add_action_or_reset(&spi->dev,
> -        ad7380_regulator_disable,
> vcm);
> - if (ret)
> - return ret;
> -
> - ret = regulator_get_voltage(vcm);
> + ret = devm_regulator_get_enable_read_voltage(&spi->dev, vcm);
>   if (ret < 0)
> - return ret;
> + return dev_err_probe(&spi->dev, ret,
> +      "Failed to get %s regulator\n",
> +      vcm);
>  
>   st->vcm_mv[i] = ret / 1000;
>   }
> @@ -1135,7 +1096,7 @@ static int ad7380_probe(struct spi_device *spi)
>   if (ret)
>   return ret;
>  
> - ret = ad7380_init(st, vref);
> + ret = ad7380_init(st, external_ref_en);
>   if (ret)
>   return ret;
>  
>