linux-kernel - Re: [PATCH v3 04/11] gpiolib: provide gpio_device_find_by

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Message-ID: <ZRQhIqpb6Ho9ifgz@smile.fi.intel.com>
Date:   Wed, 27 Sep 2023 15:33:38 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
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 v3 04/11] gpiolib: provide gpio_device_find_by_label()

On Wed, Sep 27, 2023 at 01:22:36PM +0200, Bartosz Golaszewski wrote:
> On Mon, Sep 18, 2023 at 9:19 AM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> >
> > On Fri, Sep 15, 2023 at 05:03:19PM +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.

...

> > > +static int gpio_chip_match_by_label(struct gpio_chip *gc, void *label)
> > > +{
> > > +     return gc->label && !strcmp(gc->label, label);
> > > +}
> >
> > I am still wondering if we can oblige providers to have label to be non-empty.
> 
> Of course we can. Just bail out of gpiochip_add_data_with_key() if it
> is. But that's material for a different patch.

Yes, but my point here is that
1) the current users are already following this requirement;
2) the enforcement can be done explicitly somewhere (in the register function).

Is the 1) incorrect assumption?

-- 
With Best Regards,
Andy Shevchenko