Re: [PATCH v6 10/21] dt-bindings: display: renesas,rzg2l-du: Add support for RZ/G3E SoC

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Wed, Apr 08, 2026 at 12:36:55PM +0200, Tommaso Merciai wrote:
> The RZ/G3E SoC has 2 LCD controllers (LCDC), each containing a Frame
> Compression Processor (FCPVD), a Video Signal Processor (VSPD), and a
> Display Unit (DU).
> 
>  - LCDC0 supports DSI and LVDS (single or dual-channel) outputs.
>  - LCDC1 supports DSI, LVDS (single-channel), and RGB outputs.
> 
> Add a new SoC-specific compatible string 'renesas,r9a09g047-du'.
> 
> Extend patternProperties from "^port@[0-1]$" to "^port@[0-3]$" to
> allow up to four output ports, and explicitly disable port@2 and port@3
> for existing SoCs that do not expose them.
> 
> Describe the four output ports of the RZ/G3E DU:
> 
>  - port@0: DSI (available on both LCDC instances)
>  - port@1: DPAD / parallel RGB (LCDC1 only)
>  - port@2: LVDS channel 0 (LCDC0 only)
>  - port@3: LVDS channel 1 (available on both LCDC instances)
> 
> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
> ---
> v5->v6:
>  - Extend patternProperties from "^port@[0-1]$" to "^port@[0-3]$" and
>    explicitly disable port@2 and port@3 for existing SoCs that do not expose
>    them.
>  - Reworked ports numbering + improved/fixed ports descriptions in the
>    bindings documentation.
>  - Improved commit body.
> 
> 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    | 30 ++++++++++++++++++-
>  1 file changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
> index 5add3b832eab..32da0b5ec88c 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:
> @@ -61,7 +62,7 @@ properties:
>        model-dependent. Each port shall have a single endpoint.
>  
>      patternProperties:
> -      "^port@[0-1]$":
> +      "^port@[0-3]$":
>          $ref: /schemas/graph.yaml#/properties/port
>          unevaluatedProperties: false
>  
> @@ -103,6 +104,8 @@ allOf:
>              port@0:
>                description: DPI
>              port@1: false
> +            port@2: false
> +            port@3: false
>  
>            required:
>              - port@0
> @@ -119,6 +122,8 @@ allOf:
>                description: DSI
>              port@1:
>                description: DPI
> +            port@2: false
> +            port@3: false
>  
>            required:
>              - port@0
> @@ -135,9 +140,32 @@ allOf:
>              port@0:
>                description: DSI
>              port@1: false
> +            port@2: false
> +            port@3: false
>  
>            required:
>              - port@0
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r9a09g047-du
> +    then:
> +      properties:
> +        ports:
> +          properties:
> +            port@0:
> +              description: DSI
> +            port@1:
> +              description: DPAD
> +            port@2:
> +              description: LVDS, Channel 0
> +            port@3:
> +              description: LVDS, Channel 1
> +
> +          required:
> +            - port@0
> +            - port@3

Why are ports 1 and 2 not required ?

>  
>  examples:
>    # RZ/G2L DU

-- 
Regards,

Laurent Pinchart