linux-kernel - Re: [PATCH v2 3/4] dt-bindings: can: renesas,rcar-canfd: Document RZ/T2H and RZ/N2H SoCs

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Message-ID: <20260102-petite-gentle-wasp-81bbb8@quoll>
Date: Fri, 2 Jan 2026 12:20:51 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Marc Kleine-Budde <mkl@...gutronix.de>, 
	Vincent Mailhol <mailhol@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>, 
	Biju Das <biju.das.jz@...renesas.com>, linux-can@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 3/4] dt-bindings: can: renesas,rcar-canfd: Document
 RZ/T2H and RZ/N2H SoCs

On Tue, Dec 30, 2025 at 11:58:13AM +0000, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Document the CAN-FD controller used on the RZ/T2H and RZ/N2H SoCs. The
> CAN-FD IP is largely compatible with the R-Car Gen4 block, but differs
> in that AFLPN and CFTML are different, there is no reset line for the IP,
> and it only supports two channels.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v1->v2:
> - No changes made.
> ---
>  .../bindings/net/can/renesas,rcar-canfd.yaml  | 26 ++++++++++++++++++-
>  1 file changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> index fb709cfd26d7..4a83e9e34d67 100644
> --- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> +++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> @@ -50,6 +50,12 @@ properties:
>                - renesas,r9a09g057-canfd     # RZ/V2H(P)
>            - const: renesas,r9a09g047-canfd
>  
> +      - const: renesas,r9a09g077-canfd      # RZ/T2H


That's part of other enum with single compatibles.

> +
> +      - items:
> +          - const: renesas,r9a09g087-canfd  # RZ/N2H
> +          - const: renesas,r9a09g077-canfd
> +
>    reg:
>      maxItems: 1
>  
> @@ -179,7 +185,6 @@ required:
>    - clocks
>    - clock-names
>    - power-domains
> -  - resets
>    - assigned-clocks
>    - assigned-clock-rates
>    - channel0
> @@ -243,11 +248,30 @@ allOf:
>            minItems: 2
>            maxItems: 2
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r9a09g077-canfd
> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 8
> +
> +        interrupt-names:
> +          maxItems: 8
> +
> +        resets: false
> +    else:
> +      required:
> +        - resets

Why is this de-synced with reset-names? Properties are supposed to
behave the same way, not once requiring resets other time requiring
reset-names.

Best regards,
Krzysztof