On Tue, 17 Oct 2023 13:46:51 +0000
"Hennerich, Michael" <Michael.Hennerich@xxxxxxxxxx> wrote:
> > -----Original Message-----
> > From: David Lechner <dlechner@xxxxxxxxxxxx>
> > Sent: Montag, 16. Oktober 2023 17:43
> > To: linux-iio@xxxxxxxxxxxxxxx
> > Cc: David Lechner <dlechner@xxxxxxxxxxxx>; Jonathan Cameron
> > <jic23@xxxxxxxxxx>; Hennerich, Michael <Michael.Hennerich@xxxxxxxxxx>;
> > Sa, Nuno <Nuno.Sa@xxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx
> > Subject: [PATCH] iio: resolver: ad2s1210: add reset gpio support
> >
> >
> > This adds support for the optional reset gpio to the ad2s1210 resolver driver. If
> > the gpio is present in the device tree, it is toggled during driver probe before the
> > reset of the device initialization. As per the devicetree bindings, it is expected for
> > the gpio to configured as active low.
> >
> > Suggested-by: Michael Hennerich <Michael.Hennerich@xxxxxxxxxx>
> > Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx>
> > ---
>
> Acked-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Applied and pushed out as testing for 0-day to poke at it.
Thanks,
Jonathan
>
> > drivers/iio/resolver/ad2s1210.c | 12 ++++++++++++
> > 1 file changed, 12 insertions(+)
> >
> > diff --git a/drivers/iio/resolver/ad2s1210.c b/drivers/iio/resolver/ad2s1210.c
> > index 8646389ec88d..a414eef12e5e 100644
> > --- a/drivers/iio/resolver/ad2s1210.c
> > +++ b/drivers/iio/resolver/ad2s1210.c
> > @@ -1426,6 +1426,7 @@ static int ad2s1210_setup_gpios(struct
> > ad2s1210_state *st) {
> > struct device *dev = &st->sdev->dev;
> > struct gpio_descs *resolution_gpios;
> > + struct gpio_desc *reset_gpio;
> > DECLARE_BITMAP(bitmap, 2);
> > int ret;
> >
> > @@ -1481,6 +1482,17 @@ static int ad2s1210_setup_gpios(struct
> > ad2s1210_state *st)
> > "failed to set resolution gpios\n");
> > }
> >
> > + /* If the optional reset GPIO is present, toggle it to do a hard reset. */
> > + reset_gpio = devm_gpiod_get_optional(dev, "reset",
> > GPIOD_OUT_HIGH);
> > + if (IS_ERR(reset_gpio))
> > + return dev_err_probe(dev, PTR_ERR(reset_gpio),
> > + "failed to request reset GPIO\n");
> > +
> > + if (reset_gpio) {
> > + udelay(10);
> > + gpiod_set_value(reset_gpio, 0);
> > + }
> > +
> > return 0;
> > }
> >
> > --
> > 2.42.0
>
