On 12/17, Jonathan Cameron wrote:
> 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.
Could be. If we stick to the fact that the dt-binding does not require a voltage
regulator then this can be seen as a fix.
Though, if users can provide an external reference this patch makes no
difference them.
I am using the internal reference for testing so having this one makes a
difference for me.
>
> 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)
>
>
