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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Thu, 6 Dec 2018 09:58:30 +0100
Message-ID: <CACRpkdaSuU+v1yZm-GXBH693JbVZysXm6_1939ct50arKJn2qw@mail.gmail.com>
Subject: Re: [PATCH 06/15 v3] regulator: max8973: Let core handle GPIO descriptor
To:     Charles Keepax <ckeepax@opensource.cirrus.com>
Cc:     Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>
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On Wed, Dec 5, 2018 at 4:33 PM Charles Keepax
<ckeepax@opensource.cirrus.com> wrote:
> On Wed, Dec 05, 2018 at 03:42:06PM +0100, Linus Walleij wrote:
> > On Wed, Dec 5, 2018 at 2:43 PM Charles Keepax
> > <ckeepax@opensource.cirrus.com> wrote:
> > > On Wed, Dec 05, 2018 at 01:47:12PM +0100, Linus Walleij wrote:
> > > > @@ -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?
>
> Yeah, patch 1 makes the regulator core consistently handle GPIOs
> that are passed into it.

Sorry. I confused this patch for the max77686 patch. That
one was fixed with patch 01...

> However, on the MAX77621 path in this
> switch statement the GPIO is never passed into the regulator
> core, so the core never takes ownership of it, so the driver still
> needs to manage the lifetime.
>
> It should be a pretty easy fix though as commented on v2, again
> apologies for the slow review.

OK I switch it to devm_ as you suggested, as we implemented
gpiod_unhinge it's a piece of cake nowadays.

Thanks a lot!
Linus Walleij