linux-kernel - Re: [PATCH v3 2/5] dt-bindings: display: ssd1307fb: Extend schema for SPI controllers

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Date:   Wed, 13 Apr 2022 12:38:26 +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>,
        Neil Armstrong <narmstrong@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Mark Brown <broonie@...nel.org>,
        Chen-Yu Tsai <wens@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        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 v3 2/5] dt-bindings: display: ssd1307fb: Extend schema for
 SPI controllers

Hi Javier,

On Wed, Apr 13, 2022 at 11:44 AM Javier Martinez Canillas
<javierm@...hat.com> wrote:
> On 4/13/22 10:04, Geert Uytterhoeven wrote:
> > On Tue, Apr 12, 2022 at 6:27 PM Javier Martinez Canillas
> > <javierm@...hat.com> wrote:
> >> The Solomon SSD130x OLED displays can either have an I2C or SPI interface,
> >> add to the schema the properties and examples for OLED devices under SPI.
> >>
> >> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> >> Acked-by: Mark Brown <broonie@...nel.org>
> >> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >> ---
> >>
> >> Changes in v3:
> >> - Add a comment to the properties required for SPI (Geert Uytterhoeven)
> >
> > Thanks for the update!
> >
> >> --- a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
> >> +++ b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
> >> @@ -38,9 +38,16 @@ properties:
> >>    reset-gpios:
> >>      maxItems: 1
> >>
> >> +  # Only required for SPI
> >> +  dc-gpios:
> >> +    maxItems: 1
> >
> > Actually I meant to also add a description, like for vbat-supply below,
> > to explain the meaning of "dc".
> >
>
> Ahh, sorry for misunderstanding you! Something like the following looks good ?
>
>   # Only required for SPI
>   dc-gpios:
>     description:
>       GPIO connected to the controller's D/C# (Data/Command) pin,
>       that is needed for 4-wire SPI to tell the controller if the
>       data sent is for a command register or the display data RAM
>     maxItems: 1
>
> If you agree with that, then can squash before pushing or add it to a v4
> if another revision is needed.

Thanks, LGTM.

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