[PATCH 1/7] dt-bindings: display: renesas,du: Document Renesas R-Car R8A779MD M3Le

[Geert Uytterhoeven]

Hi Marek,

Thanks for your patch!

On Sun, 19 Apr 2026 at 21:37, Marek Vasut
<marek.vasut+renesas at mailbox.org> wrote:
> Extend the Renesas DU display bindings to support the Renesas R-Car
> R8A779MD M3Le SoC. This SoC is similar to R-Car R8A77965 M3-N SoC,
> except the HDMI port at 1 is not present.

"and DU1 is unused." (whatever that may mean...)

>
> Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>

> --- a/Documentation/devicetree/bindings/display/renesas,du.yaml
> +++ b/Documentation/devicetree/bindings/display/renesas,du.yaml
> @@ -42,6 +42,7 @@ properties:
>        - renesas,du-r8a779a0 # for R-Car V3U compatible DU
>        - renesas,du-r8a779g0 # for R-Car V4H compatible DU
>        - renesas,du-r8a779h0 # for R-Car V4M compatible DU
> +      - renesas,du-r8a779md # for R-Car M3Le compatible DU

I am not sure you need a new compatible value: is the DU really
different than on R-Car M3-N, or does it just lack some wiring? ...

>
>    reg:
>      maxItems: 1
> @@ -890,6 +891,75 @@ allOf:
>          - reset-names
>          - renesas,vsps
>
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - renesas,du-r8a779md
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 3
> +          items:
> +            - description: Functional clock for DU0
> +            - description: Functional clock for DU1

... E.g. you still have a module clock for DU1 (the documentation
for R-Car M3Le does not mention any changes in clocks).

> +            - description: Functional clock for DU3
> +            - description: DU_DOTCLKIN0 input clock
> +            - description: DU_DOTCLKIN1 input clock

... E.g. the package is documented to have pin DU_DOTCLKIN1.

> +            - description: DU_DOTCLKIN3 input clock
> +
> +        clock-names:
> +          minItems: 3
> +          items:
> +            - const: du.0
> +            - const: du.1
> +            - const: du.3
> +            - pattern: '^dclkin\.[013]$'
> +            - pattern: '^dclkin\.[013]$'
> +            - pattern: '^dclkin\.[013]$'
> +
> +        interrupts:
> +          minItems: 3
> +          maxItems: 3

... E.g. you still have an interrupt for DU1 (the documentation
for R-Car M3Le does not mention any changes in interrupts).

> +
> +        resets:
> +          minItems: 2
> +          maxItems: 2
> +
> +        reset-names:
> +          items:
> +            - const: du.0
> +            - const: du.3
> +
> +        ports:
> +          properties:
> +            port at 0:
> +              description: DPAD 0
> +            port at 1: false

Perhaps port at 1 can be present (and thus required), but left unconnected
instead?

> +            port at 2:
> +              description: LVDS 0
> +            port at 3: false
> +
> +          required:
> +            - port at 0
> +            - port at 2
> +
> +        renesas,cmms:
> +          minItems: 3
> +          maxItems: 3
> +
> +        renesas,vsps:
> +          minItems: 3
> +          maxItems: 3

Your arch/arm64/boot/dts/renesas/r8a779md.dtsi only has two entries
in renesas,cmms and renesas,vsps?

> +
> +      required:
> +        - clock-names
> +        - interrupts
> +        - resets
> +        - reset-names
> +        - renesas,vsps
> +
>  additionalProperties: false
>
>  examples:

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds