[PATCH 4/4] dt-bindings: display: bridge: renesas, dsi-csi2-tx: Allow panel@ subnode

[Dmitry Baryshkov]

On Thu, Sep 04, 2025 at 10:03:08PM +0200, Marek Vasut wrote:
> This controller can have both bridges and panels connected to it. In
> order to describe panels properly in DT, pull in dsi-controller.yaml
> and disallow only unevaluatedProperties, because the panel node is
> optional. Include example binding with panel.
> 
> Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
> ---
> Cc: Conor Dooley <conor+dt at kernel.org>
> Cc: David Airlie <airlied at gmail.com>
> Cc: Geert Uytterhoeven <geert+renesas at glider.be>
> Cc: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
> Cc: Krzysztof Kozlowski <krzk+dt at kernel.org>
> Cc: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
> Cc: Neil Armstrong <neil.armstrong at linaro.org>
> Cc: Rob Herring <robh at kernel.org>
> Cc: Robert Foss <rfoss at kernel.org>
> Cc: Simona Vetter <simona at ffwll.ch>
> Cc: Thomas Zimmermann <tzimmermann at suse.de>
> Cc: Tomi Valkeinen <tomi.valkeinen+renesas at ideasonboard.com>
> Cc: devicetree at vger.kernel.org
> Cc: dri-devel at lists.freedesktop.org
> Cc: linux-renesas-soc at vger.kernel.org
> ---
>  .../display/bridge/renesas,dsi-csi2-tx.yaml   | 53 ++++++++++++++++++-
>  1 file changed, 51 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/renesas,dsi-csi2-tx.yaml b/Documentation/devicetree/bindings/display/bridge/renesas,dsi-csi2-tx.yaml
> index c167795c63f64..f663bc6a6f831 100644
> --- a/Documentation/devicetree/bindings/display/bridge/renesas,dsi-csi2-tx.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/renesas,dsi-csi2-tx.yaml
> @@ -14,6 +14,9 @@ description: |
>    R-Car Gen4 SoCs. The encoder can operate in either DSI or CSI-2 mode, with up
>    to four data lanes.
>  
> +allOf:
> +  - $ref: /schemas/display/dsi-controller.yaml#
> +
>  properties:
>    compatible:
>      enum:
> @@ -80,14 +83,14 @@ required:
>    - resets
>    - ports
>  
> -additionalProperties: false
> +unevaluatedProperties: false
>  
>  examples:
>    - |
>      #include <dt-bindings/clock/r8a779a0-cpg-mssr.h>
>      #include <dt-bindings/power/r8a779a0-sysc.h>
>  
> -    dsi0: dsi-encoder at fed80000 {
> +    dsi0: dsi at fed80000 {

As you are touching this, you can drop the label too.

>          compatible = "renesas,r8a779a0-dsi-csi2-tx";
>          reg = <0xfed80000 0x10000>;
>          power-domains = <&sysc R8A779A0_PD_ALWAYS_ON>;
> @@ -117,4 +120,50 @@ examples:
>              };
>          };
>      };
> +
> +  - |
> +    #include <dt-bindings/clock/r8a779g0-cpg-mssr.h>
> +    #include <dt-bindings/power/r8a779g0-sysc.h>
> +
> +    dsi1: dsi at fed80000 {

No need for the label (dsi1:)

> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        compatible = "renesas,r8a779g0-dsi-csi2-tx";
> +        reg = <0xfed80000 0x10000>;
> +        clocks = <&cpg CPG_MOD 415>,
> +                 <&cpg CPG_CORE R8A779G0_CLK_DSIEXT>,
> +                 <&cpg CPG_CORE R8A779G0_CLK_DSIREF>;
> +        clock-names = "fck", "dsi", "pll";
> +        power-domains = <&sysc R8A779G0_PD_ALWAYS_ON>;
> +        resets = <&cpg 415>;
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port at 0 {
> +                reg = <0>;
> +            };
> +
> +            port at 1 {
> +                reg = <1>;
> +
> +                dsi0port1_out: endpoint {
> +                    remote-endpoint = <&panel_in>;
> +                    data-lanes = <1 2>;
> +                };
> +            };
> +        };
> +
> +        panel at 0 {
> +            reg = <0>;
> +            compatible = "raspberrypi,dsi-7inch";
> +
> +            port {
> +                panel_in: endpoint {
> +                    remote-endpoint = <&dsi0port1_out>;
> +                };
> +            };
> +        };
> +    };
>  ...
> -- 
> 2.50.1
> 

-- 
With best wishes
Dmitry