linux-kernel - Re: [PATCH RFC] gpio: Add Virtual Aggregator GPIO Driver

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Message-ID: <CAMuHMdXOhrc1o5Jh3TN+JT4VFSSMg8Wy-rsgH=b8hNZQd8rXiA@mail.gmail.com>
Date:   Fri, 6 Sep 2019 13:09:39 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexander Graf <agraf@...e.de>,
        Peter Maydell <peter.maydell@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Magnus Damm <magnus.damm@...il.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        QEMU Developers <qemu-devel@...gnu.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] gpio: Add Virtual Aggregator GPIO Driver

On Tue, Jul 9, 2019 at 4:59 PM Bartosz Golaszewski
<bgolaszewski@...libre.com> wrote:
> pon., 8 lip 2019 o 12:24 Geert Uytterhoeven <geert@...ux-m68k.org> napisał(a):
> > On Mon, Jul 8, 2019 at 11:45 AM Bartosz Golaszewski
> > <bgolaszewski@...libre.com> wrote:
> > > pt., 5 lip 2019 o 18:05 Geert Uytterhoeven <geert+renesas@...der.be> napisał(a):
> > > > +static int gpio_virt_agg_set_config(struct gpio_chip *chip,
> > > > +                                   unsigned int offset, unsigned long config)
> > > > +{
> > > > +       struct gpio_virt_agg_priv *priv = gpiochip_get_data(chip);
> > > > +
> > > > +       chip = priv->desc[offset]->gdev->chip;
> > > > +       if (chip->set_config)
> > > > +               return chip->set_config(chip, offset, config);
> > > > +
> > > > +       // FIXME gpiod_set_transitory() expects success if not implemented
> >
> > BTW, do you have a comment about this FIXME?
>
> Ha! Interesting. I'll give it a thought and respond elsewhere as it's
> a different subject.
>
> > > > +       return -ENOTSUPP;

Upon closer look, this turns out to be a red herring: gpiod_set_transitory()
converts -ENOTSUPP to zero, so there is no issue.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds