linux-kernel - Re: [PATCH] gpio: rcar: Remove redundant compatible values

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Date:   Mon, 4 Jan 2021 11:36:25 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH] gpio: rcar: Remove redundant compatible values

Hi Prabhakar,

On Thu, Dec 31, 2020 at 4:31 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> The mandatory compatible values 'renesas,rcar-gen{1,2,3}-gpio' have been
> already added to all the respective R-Car Gen{1,2,3} SoC DTSI files,
> remove the redundant device specific values from the driver.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Thanks for your patch!

> --- a/drivers/gpio/gpio-rcar.c
> +++ b/drivers/gpio/gpio-rcar.c
> @@ -392,33 +392,6 @@ static const struct gpio_rcar_info gpio_rcar_info_gen2 = {
>
>  static const struct of_device_id gpio_rcar_of_table[] = {
>         {
> -               .compatible = "renesas,gpio-r8a7743",
> -               /* RZ/G1 GPIO is identical to R-Car Gen2. */
> -               .data = &gpio_rcar_info_gen2,
> -       }, {
> -               .compatible = "renesas,gpio-r8a7790",
> -               .data = &gpio_rcar_info_gen2,
> -       }, {
> -               .compatible = "renesas,gpio-r8a7791",
> -               .data = &gpio_rcar_info_gen2,
> -       }, {
> -               .compatible = "renesas,gpio-r8a7792",
> -               .data = &gpio_rcar_info_gen2,
> -       }, {
> -               .compatible = "renesas,gpio-r8a7793",
> -               .data = &gpio_rcar_info_gen2,
> -       }, {
> -               .compatible = "renesas,gpio-r8a7794",
> -               .data = &gpio_rcar_info_gen2,
> -       }, {
> -               .compatible = "renesas,gpio-r8a7795",
> -               /* Gen3 GPIO is identical to Gen2. */
> -               .data = &gpio_rcar_info_gen2,
> -       }, {
> -               .compatible = "renesas,gpio-r8a7796",
> -               /* Gen3 GPIO is identical to Gen2. */
> -               .data = &gpio_rcar_info_gen2,
> -       }, {
>                 .compatible = "renesas,rcar-gen1-gpio",
>                 .data = &gpio_rcar_info_gen1,
>         }, {

The reason the driver matches on these SoC-specific compatible values is
that originally the family-specific compatible values did not exist, and
the device nodes in the initial DTS files thus did not use them.  The
family-specific compatible values were added to the DTS files in v4.15.
However, as this was backported to all v4.14-based R-Car BSP releases
(3.6.0 and later), I think it is safe to apply this.

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

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