linux-kernel - Re: [PATCH v2 7/9] gpio: mockup: pass the chip label as device property

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Date:   Mon, 28 Sep 2020 15:13:53 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Kent Gibson <warthog618@...il.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        linux-doc <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 7/9] gpio: mockup: pass the chip label as device property

On Mon, Sep 28, 2020 at 3:00 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Mon, Sep 28, 2020 at 12:41:53PM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > While we do check the "chip-name" property in probe(), we never actually
> > use it. Let's pass the chip label to the driver using device properties
> > as we'll want to allow users to define their own once dynamically
> > created chips are supported.
> >
> > The property is renamed to "chip-label" to not cause any confusion with
> > the actual chip name which is of the form: "gpiochipX".
> >

^^^ here, see below

> > If the "chip-label" property is missing, let's do what most devices in
> > drivers/gpio/ do and use dev_name().
>
> ...
>
> > +             snprintf(chip_label, sizeof(chip_label),
> > +                      "gpio-mockup-%c", i + 'A');
> > +             properties[prop++] = PROPERTY_ENTRY_STRING("chip-label",
> > +                                                        chip_label);
>
> You added new property, now count is up to 4. But at the same time
>
>         #define GPIO_MOCKUP_MAX_PROP  4
>
> how do you avoid overflow?
>

I renamed the property, the previous "chip-name" is no longer used. In
fact it was never used but was accounted for in GPIO_MOCKUP_MAX_PROP.

Bart