linux-kernel - Re: [PATCH 1/5] dt-bindings: display: ssd1307fb: Deprecate fbdev compatible strings

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Date:   Mon, 11 Apr 2022 15:47:13 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Chen-Yu Tsai <wens@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/5] dt-bindings: display: ssd1307fb: Deprecate fbdev
 compatible strings

Hi Javier,

On Thu, Apr 7, 2022 at 10:03 PM Javier Martinez Canillas
<javierm@...hat.com> wrote:
> The current compatible strings for SSD130x I2C controllers contain an -fb
> suffix, this seems to indicate that are for a fbdev driver. But the DT is
> supposed to describe the hardware and not Linux implementation details.
>
> Let's deprecate those compatible strings and add a new enum that contains
> compatible strings that don't have a -fb suffix. These will be matched by
> the ssd130x-i2c DRM driver.
>
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>

> --- a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
> +++ b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
> @@ -12,12 +12,24 @@ maintainers:
>
>  properties:
>    compatible:
> -    enum:
> -      - sinowealth,sh1106-i2c
> -      - solomon,ssd1305fb-i2c
> -      - solomon,ssd1306fb-i2c
> -      - solomon,ssd1307fb-i2c
> -      - solomon,ssd1309fb-i2c
> +    oneOf:
> +      # Deprecated compatible strings
> +      - items:
> +          - enum:
> +              - solomon,ssd1305fb-i2c
> +              - solomon,ssd1306fb-i2c
> +              - solomon,ssd1307fb-i2c
> +              - solomon,ssd1309fb-i2c

Please drop the "-i2c" suffixes, too.
We already have plenty of IIO sensors and audio codecs using the
same compatible value for spi and i2c, cfr.
'git grep compatible -- "*-[si][p2][ic].c"'

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