linux-kernel - Re: [PATCH v3 3/4] dt-bindings: serial: renesas,scif: Document R9A09G057 support

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Date: Wed, 20 Mar 2024 09:37:09 -0500
From: Rob Herring <robh@...nel.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v3 3/4] dt-bindings: serial: renesas,scif: Document
 R9A09G057 support

On Mon, Mar 18, 2024 at 05:21:01PM +0000, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Document support for the Serial Communication Interface with FIFO (SCIF)
> available in the Renesas RZ/V2H(P) (R9A09G057) SoC. The SCIF interface in
> the Renesas RZ/V2H(P) is similar to that available in the RZ/G2L
> (R9A07G044) SoC, with the only difference being that the RZ/V2H(P) SoC has
> three additional interrupts: one for Tx end/Rx ready and the other two for
> Rx and Tx buffer full, which are edge-triggered.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v2->v3
> - Added SoC specific compat string
> ---
>  .../bindings/serial/renesas,scif.yaml         | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/serial/renesas,scif.yaml b/Documentation/devicetree/bindings/serial/renesas,scif.yaml
> index 53f18e9810fd..e4ce13e20cd7 100644
> --- a/Documentation/devicetree/bindings/serial/renesas,scif.yaml
> +++ b/Documentation/devicetree/bindings/serial/renesas,scif.yaml
> @@ -79,6 +79,8 @@ properties:
>                - renesas,scif-r9a08g045      # RZ/G3S
>            - const: renesas,scif-r9a07g044   # RZ/G2{L,LC} fallback
>  
> +      - const: renesas,scif-r9a09g057       # RZ/V2H(P)

I don't understand why there's not a fallback. Looks like the existing 
driver would work if you had one. It should be fine to ignore the new 
interrupts. Though with Geert's comments, it seems there are more 
differences than you say. 

Rob