[PATCH] ASoC: max98390: Add reset gpio control

[Lee Steve]

On Thu, Mar 10, 2022 at 5:48 PM Sa, Nuno <Nuno.Sa at analog.com> wrote:
>
> Hi Steve,
>
> > From: Steve Lee <steve.lee.analog at gmail.com>
> > Sent: Thursday, March 10, 2022 9:16 AM
> > To: lgirdwood at gmail.com; broonie at kernel.org; perex at perex.cz;
> > tiwai at suse.com; ckeepax at opensource.cirrus.com; geert at linux-
> > m68k.org; rf at opensource.wolfsonmicro.com; shumingf at realtek.com;
> > srinivas.kandagatla at linaro.org; krzk at kernel.org; dmurphy at ti.com;
> > jack.yu at realtek.com; Sa, Nuno <Nuno.Sa at analog.com>;
> > steves.lee at maximintegrated.com; linux-kernel at vger.kernel.org;
> > alsa-devel at alsa-project.org
> > Cc: Steve Lee <steve.lee.analog at gmail.com>
> > Subject: [PATCH] ASoC: max98390: Add reset gpio control
> >
> > [External]
> >
> >  Add reset gpio control to support RESET PIN connected to gpio.
> >
> > Signed-off-by: Steve Lee <steve.lee.analog at gmail.com>
> > ---
> >  sound/soc/codecs/max98390.c | 18 ++++++++++++++++++
> >  sound/soc/codecs/max98390.h |  1 +
> >  2 files changed, 19 insertions(+)
> >
> > diff --git a/sound/soc/codecs/max98390.c
> > b/sound/soc/codecs/max98390.c
> > index b392567c2b3e..574d8d5f1119 100644
> > --- a/sound/soc/codecs/max98390.c
> > +++ b/sound/soc/codecs/max98390.c
> > @@ -1073,6 +1073,24 @@ static int max98390_i2c_probe(struct
> > i2c_client *i2c,
> >               return ret;
> >       }
> >
> > +     max98390->reset_gpio = of_get_named_gpio(i2c-
> > >dev.of_node,
> > +                                             "maxim,reset-gpios", 0);
>
> Why not using devm_gpiod_get_optional()? We could request the pin
> already in the asserted state and make the code slightly better...
>
> /* I guess there's no need to save it in our struct as we only use it here? */
> struct gpio_desc *reset_gpio;
>
> reset_gpio = devm_gpiod_get_optional(&i2c->dev, "reset", GPIOD_OUT_HIGH);
> if (reset_gpio) {
>       usleep_range(1000, 2000);
>      /* bring out of reset */
>       gpio_direction_output(max98390->reset_gpio, 0);
>       usleep_range(1000, 2000);
> }
>
> Also, do we have this on the bindings doc? If not, it should be done on a second
> patch on this series...
>
> - Nuno Sá
>

Thanks for comment on this patch. I will check and update as commented.