linux-kernel - Re: [V3 1/2] ASoC: max98390: Add reset gpio control

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Date:   Mon, 28 Mar 2022 21:50:59 +0900
From:   Lee Steve <steve.lee.analog@...il.com>
To:     "Sa, Nuno" <Nuno.Sa@...log.com>
Cc:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "ryans.lee@...imintegrated.com" <ryans.lee@...imintegrated.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "krzk@...nel.org" <krzk@...nel.org>
Subject: Re: [V3 1/2] ASoC: max98390: Add reset gpio control

On Mon, Mar 28, 2022 at 4:42 PM Sa, Nuno <Nuno.Sa@...log.com> wrote:
>
> > From: Steve Lee <steve.lee.analog@...il.com>
> > Sent: Monday, March 28, 2022 4:12 AM
> > To: lgirdwood@...il.com; broonie@...nel.org; perex@...ex.cz;
> > tiwai@...e.com; ryans.lee@...imintegrated.com; linux-
> > kernel@...r.kernel.org; alsa-devel@...a-project.org
> > Cc: krzk@...nel.org; Sa, Nuno <Nuno.Sa@...log.com>; Steve Lee
> > <steve.lee.analog@...il.com>
> > Subject: [V3 1/2] 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@...il.com>
> > ---
> >  sound/soc/codecs/max98390.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/sound/soc/codecs/max98390.c
> > b/sound/soc/codecs/max98390.c
> > index 40fd6f363f35..05df9b85d9b0 100644
> > --- a/sound/soc/codecs/max98390.c
> > +++ b/sound/soc/codecs/max98390.c
> > @@ -1022,6 +1022,7 @@ static int max98390_i2c_probe(struct
> > i2c_client *i2c,
> >
> >       struct max98390_priv *max98390 = NULL;
> >       struct i2c_adapter *adapter = i2c->adapter;
> > +     struct gpio_desc *reset_gpio;
> >
> >       ret = i2c_check_functionality(adapter,
> >               I2C_FUNC_SMBUS_BYTE
> > @@ -1073,6 +1074,17 @@ static int max98390_i2c_probe(struct
> > i2c_client *i2c,
> >               return ret;
> >       }
> >
> > +     reset_gpio = devm_gpiod_get_optional(&i2c->dev,
> > +                                          "reset", GPIOD_OUT_LOW);
> > +
> > +     /* Power on device */
> > +     if (reset_gpio) {
> > +             usleep_range(1000, 2000);
> > +             /* bring out of reset */
> > +             gpiod_set_value_cansleep(reset_gpio, 1);
>
> Note this will set the gpio in the asserted state. Being it active low, this will
> do the opposite thing that you are trying to accomplish...
>
> - Nuno Sá

I agree with your comment. I will update next version patch if there
is other concern.