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 11:44:34 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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

Hello Geert,

On 4/13/22 10:04, Geert Uytterhoeven wrote:
> Hi Javier,
> 
> 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.

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat