RE: [PATCH v5 09/20] dt-bindings: display: renesas,rzg2l-du: Add support for RZ/G3E SoC

[Biju Das]

Hi Tommaso,

Thanks for the patch.

> -----Original Message-----
> From: Tommaso Merciai <tommaso.merciai.xr@xxxxxxxxxxxxxx>
> Sent: 13 February 2026 16:28
> Subject: [PATCH v5 09/20] dt-bindings: display: renesas,rzg2l-du: Add support for RZ/G3E SoC
> 
> The RZ/G3E Soc has 2 LCD controller (LCDC), contain a Frame Compression Processor (FCPVD), a Video
> Signal Processor (VSPD), Video Signal Processor (VSPD), and Display Unit (DU).
> 
>  - LCDC0 supports DSI and LVDS (single or dual-channel) outputs.
>  - LCDC1 supports DSI, LVDS (single-channel), and RGB outputs.
> 
> Add new SoC-specific compatible string 'renesas,r9a09g047-du'.
> 
> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@xxxxxxxxxxxxxx>
> ---
> v4->v5:
>  - Dropped renesas,id property and updated bindings
>    accordingly.
> 
> v2->v3:
>  - No changes.
> 
> v2->v3:
>  - No changes.
> 
> v1->v2:
>  - Use single compatible string instead of multiple compatible strings
>    for the two DU instances, leveraging a 'renesas,id' property to
>    differentiate between DU0 and DU1.
>  - Updated commit message accordingly.
> 
>  .../bindings/display/renesas,rzg2l-du.yaml    | 22 +++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
> b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
> index 2cc66dcef870..be50b153d651 100644
> --- a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
> +++ b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
> @@ -20,6 +20,7 @@ properties:
>        - enum:
>            - renesas,r9a07g043u-du # RZ/G2UL
>            - renesas,r9a07g044-du # RZ/G2{L,LC}
> +          - renesas,r9a09g047-du # RZ/G3E
>            - renesas,r9a09g057-du # RZ/V2H(P)
>        - items:
>            - enum:
> @@ -137,6 +138,27 @@ allOf:
> 
>            required:
>              - port@0
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r9a09g047-du
> +    then:
> +      properties:
> +        ports:
> +          properties:
> +            port@0:
> +              description: DSI
> +            port@1:
> +              description: LVDS Channel 0
> +            port@2:
> +              description: LVDS Channel 1
> +            port@3:
> +              description: DPAD
> +
> +          required:
> +            - port@0
> +            - port@1


LCDC0 has port@0, port@1 and port@2
LCDC1 has port@0, port@1 and port@3

Looks like from the above port@2 and port@3 are optional??

Also not sure to make port@1 for DPAD for consistency with RZ/G2L??
Do you see any advantage by making port@1 for LVDS0?

Cheers,
Biju