linux-kernel - Re: [PATCH 1/9] dt-bindings: watchdog: renesas,wdt: Add support for RZ/T2H and RZ/N2H

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Message-ID: <20250708201806.GA897559-robh@kernel.org>
Date: Tue, 8 Jul 2025 15:18:06 -0500
From: Rob Herring <robh@...nel.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Wim Van Sebroeck <wim@...ux-watchdog.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-renesas-soc@...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>
Subject: Re: [PATCH 1/9] dt-bindings: watchdog: renesas,wdt: Add support for
 RZ/T2H and RZ/N2H

On Mon, Jul 07, 2025 at 09:01:03PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Extend the Renesas WDT device tree bindings to support the watchdog timer
> found on the RZ/T2H (R9A09G077) and RZ/N2H (R9A09G087) SoCs.
> 
> The RZ/T2H WDT is mostly compatible with the one found on the RZ/V2H(P),
> but includes an additional register and differs in the clock division
> ratio settings for the WDTCR[CKS] field. To reflect these differences,
> introduce a new compatible string, "renesas,r9a09g077-wdt".
> 
> The binding schema is updated accordingly. On RZ/T2H, the WDT does not
> require the "resets" property. It also requires two register regions and
> the presence of a "power-domains" property. The "clock-names" property is
> limited to a single entry, "pclk", for this SoC.
> 
> The RZ/N2H SoC uses the same WDT IP as the RZ/T2H. It is supported by
> using "renesas,r9a09g087-wdt" as the primary compatible string, with
> "renesas,r9a09g077-wdt" listed as a fallback to describe the shared
> hardware features.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  .../bindings/watchdog/renesas,wdt.yaml        | 37 +++++++++++++++++--
>  1 file changed, 34 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
> index 78874b90c88c..ce439a401c12 100644
> --- a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
> @@ -81,10 +81,17 @@ properties:
>                - renesas,r9a09g056-wdt # RZ/V2N
>            - const: renesas,r9a09g057-wdt # RZ/V2H(P)
>  
> -      - const: renesas,r9a09g057-wdt       # RZ/V2H(P)
> +      - enum:
> +          - renesas,r9a09g057-wdt    # RZ/V2H(P)
> +          - renesas,r9a09g077-wdt    # RZ/T2H
> +
> +      - items:
> +          - const: renesas,r9a09g087-wdt # RZ/N2H
> +          - const: renesas,r9a09g077-wdt # RZ/T2H
>  
>    reg:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
>  
>    interrupts:
>      minItems: 1
> @@ -132,6 +139,7 @@ allOf:
>            compatible:
>              contains:
>                enum:
> +                - renesas,r9a09g077-wdt
>                  - renesas,rza-wdt
>                  - renesas,rzn1-wdt
>      then:
> @@ -183,7 +191,9 @@ allOf:
>        properties:
>          compatible:
>            contains:
> -            const: renesas,r9a09g057-wdt
> +            enum:
> +              - renesas,r9a09g057-wdt
> +              - renesas,r9a09g077-wdt
>      then:
>        properties:
>          interrupts: false
> @@ -192,6 +202,27 @@ allOf:
>        required:
>          - interrupts
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r9a09g077-wdt
> +    then:
> +      properties:
> +        resets: false
> +        clock-names:
> +          items:
> +            - const: pclk

Just 'maxItems: 1' as pclk is already the defined name.

With that,

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>