linux-kernel - Re: [PATCH 06/15 v3] regulator: max8973: Let core handle GPIO descriptor

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Date:   Wed, 5 Dec 2018 15:42:06 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH 06/15 v3] regulator: max8973: Let core handle GPIO descriptor

On Wed, Dec 5, 2018 at 2:43 PM Charles Keepax
<ckeepax@...nsource.cirrus.com> wrote:
> On Wed, Dec 05, 2018 at 01:47:12PM +0100, Linus Walleij wrote:
> > Use the gpiod_get() rather than the devm_* version so that the
> > regulator core can handle the lifecycle of these descriptors.
> >
> > Fixes: e7d2be696faa ("regulator: max8973: Pass descriptor instead of GPIO number")
> > Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> > ---
> > ChangeLog v2->v3:
> > - Resending.
> > ChangeLog v1->v2:
> > - Drop the gpiod_put() on the errorpath after devm_regulator_register()
> >   as this will be handled by the regulator core.
> > - Fix the second case of devm_gpiod_get()
> > - Put a comment in the code so maintainers knows not to
> >   use managed resources (devm*)
> > ---
> > @@ -775,10 +779,13 @@ static int max8973_probe(struct i2c_client *client,
> >               /*
> >                * We do not let the core switch this regulator on/off,
> >                * we just leave it on.
> > +              *
> > +              * Do not use devm* here: the regulator core takes over the
> > +              * lifecycle management of the GPIO descriptor.
> >                */
> > -             gpiod = devm_gpiod_get_optional(&client->dev,
> > -                                             "maxim,enable",
> > -                                             GPIOD_OUT_HIGH);
> > +             gpiod = gpiod_get_optional(&client->dev,
> > +                                        "maxim,enable",
> > +                                        GPIOD_OUT_HIGH);
>
> My comment on v2 still stands here, the GPIO is not passed to
> the regulator core on this path.

Patch 01 should take care of that, did you check it?

Yours,
Linus Walleij