linux-kernel - Re: [PATCH v2 2/6] dt-bindings: i2c: renesas,riic: Document RZ/T2H support

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Message-ID: <CAMuHMdUCYjPP326g9MsnH8p6gM-vy33L4OsFFMGzsZbLbucTUA@mail.gmail.com>
Date: Thu, 12 Jun 2025 14:16:49 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Chris Brandt <chris.brandt@...esas.com>, Andi Shyti <andi.shyti@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Andy Shevchenko <andy@...nel.org>, Magnus Damm <magnus.damm@...il.com>, 
	Wolfram Sang <wsa+renesas@...g-engineering.com>, linux-renesas-soc@...r.kernel.org, 
	linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>, 
	Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v2 2/6] dt-bindings: i2c: renesas,riic: Document RZ/T2H support

Hi Prabhakar,

On Mon, 9 Jun 2025 at 20:41, Prabhakar <prabhakar.csengg@...il.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Document support for the I2C Bus Interface (RIIC) found on the Renesas
> RZ/T2H (R9A09G077) SoC. The RIIC IP on this SoC is similar to that on
> the RZ/V2H(P) SoC but supports fewer interrupts, lacks FM+ support and
> does not require resets. Due to these differences, add a new compatible
> string `renesas,riic-r9a09g077` for the RZ/T2H SoC.
>
> Unlike earlier SoCs that use eight distinct interrupts, the RZ/T2H uses
> only four, including a combined error/event interrupt. Update the binding
> schema to reflect this interrupt layout and skip the `resets` property
> check, as it is not required on these SoCs.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Acked-by: Conor Dooley <conor.dooley@...rochip.com>
> Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---
> v1-> v2:
> - Listed the interrupts in the order as mentioned in the
>   HW manual.
> - Renamed the interrupt names to match the HW manual.
> - Added Acked-by and Reviewed-by tags.

Thanks for the update!

> --- a/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
> +++ b/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
> @@ -29,32 +29,46 @@ properties:
>                - renesas,riic-r9a09g056   # RZ/V2N
>            - const: renesas,riic-r9a09g057   # RZ/V2H(P)
>
> -      - const: renesas,riic-r9a09g057   # RZ/V2H(P)
> +      - enum:
> +          - renesas,riic-r9a09g057   # RZ/V2H(P)
> +          - renesas,riic-r9a09g077   # RZ/T2H
>
>    reg:
>      maxItems: 1
>
>    interrupts:
> -    items:
> -      - description: Transmit End Interrupt
> -      - description: Receive Data Full Interrupt
> -      - description: Transmit Data Empty Interrupt
> -      - description: Stop Condition Detection Interrupt
> -      - description: Start Condition Detection Interrupt
> -      - description: NACK Reception Interrupt
> -      - description: Arbitration-Lost Interrupt
> -      - description: Timeout Interrupt
> +    oneOf:
> +      - items:
> +          - description: Transmit End Interrupt
> +          - description: Receive Data Full Interrupt
> +          - description: Transmit Data Empty Interrupt
> +          - description: Stop Condition Detection Interrupt
> +          - description: Start Condition Detection Interrupt
> +          - description: NACK Reception Interrupt
> +          - description: Arbitration-Lost Interrupt
> +          - description: Timeout Interrupt
> +      - items:
> +          - description: Transmit Error Or Event Generation

s/Transmit/Transfer/

> +          - description: Receive Data Full Interrupt
> +          - description: Transmit End Interrupt
> +          - description: Transmit Data Empty Interrupt

The last two don't match the order in the documentation, and the
order in interrupt-names below.

>
>    interrupt-names:
> -    items:
> -      - const: tei
> -      - const: ri
> -      - const: ti
> -      - const: spi
> -      - const: sti
> -      - const: naki
> -      - const: ali
> -      - const: tmoi
> +    oneOf:
> +      - items:
> +          - const: tei
> +          - const: ri
> +          - const: ti
> +          - const: spi
> +          - const: sti
> +          - const: naki
> +          - const: ali
> +          - const: tmoi
> +      - items:
> +          - const: eei
> +          - const: rxi
> +          - const: txi
> +          - const: tei
>
>    clock-frequency:
>      description:

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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