linux-kernel - Re: [PATCH 2/5] dt-bindings: display: ssd1307fb: Remove default width and height values

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Date:   Mon, 5 Jun 2023 11:25:19 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 2/5] dt-bindings: display: ssd1307fb: Remove default
 width and height values

Hi,

On Mon, Jun 05, 2023 at 09:47:50AM +0200, Javier Martinez Canillas wrote:
> A default resolution in the ssd130x driver isn't set to an arbitrary 96x16
> anymore. Instead is set to a width and height that's controller dependent.
> 
> Update DT schema to reflect what the driver does and make its users aware.
> 
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
> 
>  .../devicetree/bindings/display/solomon,ssd1307fb.yaml    | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
> index 94bb5ef567c6..e8ed642dc144 100644
> --- a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
> +++ b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
> @@ -49,15 +49,15 @@ properties:
>  
>    solomon,height:
>      $ref: /schemas/types.yaml#/definitions/uint32
> -    default: 16
>      description:
> -      Height in pixel of the screen driven by the controller
> +      Height in pixel of the screen driven by the controller.
> +      The default value is controller-dependent.
>  
>    solomon,width:
>      $ref: /schemas/types.yaml#/definitions/uint32
> -    default: 96
>      description:
> -      Width in pixel of the screen driven by the controller
> +      Width in pixel of the screen driven by the controller.
> +      The default value is controller-dependent.

I think we should document it still, either in the comment itself, or
through a conditional and different default values based on the
compatible.

Maxime

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