linux-kernel - Re: [PATCH v4 09/20] dt-bindings: display: renesas,rzg2l-du: Add support for RZ/G3E SoC

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Message-ID: <20260210001108.GA2165386-robh@kernel.org>
Date: Mon, 9 Feb 2026 18:11:08 -0600
From: Rob Herring <robh@...nel.org>
To: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
Cc: tomm.merciai@...il.com, geert@...ux-m68k.org,
	laurent.pinchart@...asonboard.com,
	linux-renesas-soc@...r.kernel.org, biju.das.jz@...renesas.com,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v4 09/20] dt-bindings: display: renesas,rzg2l-du: Add
 support for RZ/G3E SoC

On Mon, Feb 02, 2026 at 12:57:40PM +0100, Tommaso Merciai wrote:
> 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@...renesas.com>
> ---
> 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.
> 
> v2->v3:
>  - No changes.
> 
> v3->v4:
>  - No changes.
> 
>  .../bindings/display/renesas,rzg2l-du.yaml    | 54 +++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
> index 2cc66dcef870..55e3fcff7030 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:
> @@ -53,6 +54,12 @@ properties:
>    power-domains:
>      maxItems: 1
>  
> +  renesas,id:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1]
> +    description: |
> +      DU instance number.

If we wanted instance numbers, there would be a common property. So why 
is this needed? What's the difference between instances besides the 
ports?

Rob