On Mon, Jul 07, 2025 at 09:01:03PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.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@bp.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@kernel.org>