Re: [PATCH] dt-bindings: watchdog: renesas,wdt: Document RZ/G3L support

[Geert Uytterhoeven]

Hi Biju,

On Fri, 6 Feb 2026 at 12:22, Biju <biju.das.au@xxxxxxxxx> wrote:
> From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
>
> Document the support for the watchdog IP available on RZ/G3L SoC. The
> watchdog IP available on RZ/G3L SoC is identical to the one found on
> RZ/G2L SoC.
>
> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>

Thanks for your patch!

> --- a/Documentation/devicetree/bindings/watchdog/renesas,rzg2l-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/renesas,rzg2l-wdt.yaml
> @@ -18,6 +18,7 @@ properties:
>                - renesas,r9a07g044-wdt    # RZ/G2{L,LC}
>                - renesas,r9a07g054-wdt    # RZ/V2L
>                - renesas,r9a08g045-wdt    # RZ/G3S
> +              - renesas,r9a08g046-wdt    # RZ/G3L
>            - const: renesas,rzg2l-wdt
>
>        - items:

However, there seems to be a small difference in the formulas for the
timeout register value on the various SoCs:

RZ/G2L, RZ/G2UL, and RZ/V2L:

    WDTTIME setting value = \frac{WDT cycle}{(WDTn_CLK (n = 0,1,2)
cycle × 1024 × 1024) − 1}

RZ/G3S and RZ/G3E:

    WDTTIME setting value = \frac{WDT cycle}{(WDTn_CLK (n = 0,1,2)
cycle × 1024 × 1024} − 1

I.e. on the former, the "- 1" offset is inside the denominator, while
on the former, it is outside the fraction.  I assume this is just a typo
in the documentation, and both formulas are supposed to be identical, so
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

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

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