On Sat, 16 Dec 2023 14:49:07 -0300
Marcelo Schmitt <marcelo.schmitt@xxxxxxxxxx> wrote:
> The ADC needs a voltage reference to work correctly.
> Enable AD7091R internal voltage reference if no external vref is supplied.
>
> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@xxxxxxxxxx>
This one sounds to me like it should have a fixes tag and be
much earlier in the set to perhaps simplify backports.
Jonathan
> ---
> drivers/iio/adc/ad7091r-base.c | 7 +++++++
> drivers/iio/adc/ad7091r-base.h | 1 +
> 2 files changed, 8 insertions(+)
>
> diff --git a/drivers/iio/adc/ad7091r-base.c b/drivers/iio/adc/ad7091r-base.c
> index aead72ef55b6..9d0b489966f5 100644
> --- a/drivers/iio/adc/ad7091r-base.c
> +++ b/drivers/iio/adc/ad7091r-base.c
> @@ -217,7 +217,14 @@ int ad7091r_probe(struct device *dev, const struct ad7091r_init_info *init_info,
> if (IS_ERR(st->vref)) {
> if (PTR_ERR(st->vref) == -EPROBE_DEFER)
> return -EPROBE_DEFER;
> +
> st->vref = NULL;
> + /* Enable internal vref */
> + ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
> + AD7091R_REG_CONF_INT_VREF, BIT(0));
> + if (ret)
> + return dev_err_probe(st->dev, ret,
> + "Error on enable internal reference\n");
> } else {
> ret = regulator_enable(st->vref);
> if (ret)
> diff --git a/drivers/iio/adc/ad7091r-base.h b/drivers/iio/adc/ad7091r-base.h
> index 81b8a4bbb929..9cfb362a00a4 100644
> --- a/drivers/iio/adc/ad7091r-base.h
> +++ b/drivers/iio/adc/ad7091r-base.h
> @@ -20,6 +20,7 @@
> #define AD7091R_REG_CH_HYSTERESIS(ch) ((ch) * 3 + 6)
>
> /* AD7091R_REG_CONF */
> +#define AD7091R_REG_CONF_INT_VREF BIT(0)
> #define AD7091R_REG_CONF_ALERT_EN BIT(4)
> #define AD7091R_REG_CONF_AUTO BIT(8)
> #define AD7091R_REG_CONF_CMD BIT(10)
