Re: [PATCH 1/2] dt-bindings: i3c: renesas,i3c: Add binding for Renesas I3C controller

[Rob Herring <robh@kernel.org>]

On Mon, Jul 14, 2025 at 11:12:08AM +0200, Wolfram Sang wrote:
> From: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
> 
> Available in R9A08G045 (RZ/G3S), R9A09G047 (RZ/G3E) SoCs.
> 
> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> ---
> 
> Changes since RFC:
> * resorted the clks, so G3S can only have the first two while G3E needs
>     needs all three
> 
>  .../devicetree/bindings/i3c/renesas,i3c.yaml  | 180 ++++++++++++++++++
>  1 file changed, 180 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i3c/renesas,i3c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/i3c/renesas,i3c.yaml b/Documentation/devicetree/bindings/i3c/renesas,i3c.yaml
> new file mode 100644
> index 000000000000..f53a176cad2c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i3c/renesas,i3c.yaml
> @@ -0,0 +1,180 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i3c/renesas,i3c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas RZ/G3S and RZ/G3E I3C Bus Interface
> +
> +maintainers:
> +  - Wolfram Sang <wsa+renesas@sang-engineering.com>
> +  - Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - renesas,r9a08g045-i3c # RZ/G3S
> +          - renesas,r9a09g047-i3c # RZ/G3E

You already have to have differences between these 2. So how are they 
the same and compatible with this:

> +      - const: renesas,i3c

Even without a difference, this seems like it will be short lived for 
how many SoC will be compatible with it (though we get to keep it 
forever). 

Rob