linux-kernel - Re: [PATCH 1/4] dt-bindings: display: panel: ili9881c: Add dsi-lanes property

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Message-ID: <20250409112846.2fb20426@kmaincent-XPS-13-7390>
Date: Wed, 9 Apr 2025 11:28:46 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang
 <quic_jesszhan@...cinc.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann
 <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter
 <simona@...ll.ch>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: display: panel: ili9881c: Add
 dsi-lanes property

On Tue, 8 Apr 2025 17:44:32 +0200
Maxime Ripard <mripard@...nel.org> wrote:

> hi,
> 
> On Tue, Apr 08, 2025 at 05:27:00PM +0200, Kory Maincent wrote:
> > Add the dsi-lanes property to specify the number of DSI lanes used by the
> > panel. This allows configuring the panel for either two, three or four
> > lanes.
> > 
> > Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
> > ---
> >  Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml | 5
> > +++++ 1 file changed, 5 insertions(+)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
> > b/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml
> > index
> > baf5dfe5f5ebdd92f460a78d0e56e1b45e7dd323..e36550616f6aac86c79832a48132ce8c11ebcf7a
> > 100644 ---
> > a/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml +++
> > b/Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml @@
> > -27,6 +27,11 @@ properties: reg: maxItems: 1 
> > +  dsi-lanes:
> > +    description: Number of DSI lanes to be used must be <2>, <3> or <4>
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    enum: [2, 3, 4]
> > +  
> 
> We have the data-lanes property for that already

Indeed but there is no such usage in panel bindings, only in bridge bindings.

You are saying that I should add something like that:
  port:                                                                        
    $ref: /schemas/graph.yaml#/properties/port

    properties:                                                             
      endpoint:                                                             
        $ref: /schemas/media/video-interfaces.yaml#                         
        unevaluatedProperties: false                                        

        data-lanes:
          minItems: 2
          maxItems: 4                                               

And use drm_of_get_data_lanes_count in the drivers.

If we do so, maybe this binding should land in panel-common.yaml instead?

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com