Re: [PATCH v3 1/4] serial: mctrl_gpio: Avoid probe failures in case of missing gpiolib

[Geert Uytterhoeven <geert@linux-m68k.org>]

On Fri, Aug 2, 2019 at 12:04 PM Schrempf Frieder
<frieder.schrempf@kontron.de> wrote:
> From: Frieder Schrempf <frieder.schrempf@kontron.de>
>
> If CONFIG_GPIOLIB is not enabled, mctrl_gpio_init() and
> mctrl_gpio_init_noauto() will currently return an error pointer with
> -ENOSYS. As the mctrl GPIOs are usually optional, drivers need to
> check for this condition to allow continue probing.
>
> To avoid the need for this check in each driver, we return NULL
> instead, as all the mctrl_gpio_*() functions are skipped anyway.
> We also adapt mctrl_gpio_to_gpiod() to be in line with this change.
>
> Reviewed-by: Fabio Estevam <festevam@gmail.com>
> Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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