linux-kernel - Re: [PATCH v4 04/11] gpiolib: provide gpio_device_find_by

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Date:   Tue, 3 Oct 2023 14:44:00 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v4 04/11] gpiolib: provide gpio_device_find_by_label()

On Mon, Oct 2, 2023 at 11:53 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> On Mon, Oct 2, 2023 at 11:44 AM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> >
> > On Wed, Sep 27, 2023 at 04:29:24PM +0200, Bartosz Golaszewski wrote:
> > > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > >
> > > By far the most common way of looking up GPIO devices is using their
> > > label. Provide a helpers for that to avoid every user implementing their
> > > own matching function.
> >
> > ...
> >
> > > +struct gpio_device *gpio_device_find_by_label(const char *label)
> > > +{
> > > +     return gpio_device_find((void *)label, gpio_chip_match_by_label);
> > > +}
> >
> > Are we expecting that data referenced by the first parameter to the
> > gpio_device_find() can be altered? If not, why not using const void *
> > there and here as well?
> >
>
> I guess it's a good idea.
>
> Bart

Scratch that. When we know that we're passing a label, it's fine to
have it const but almost treewide, various matching functions take
"void *data" as argument. I'll leave it this way.

Bart