Re: [PATCH v4 4/7] dt-bindings: watchdog: renesas,r9a09g057-wdt: Add CPG/MSSR syscon support

[Geert Uytterhoeven]

On Mon, 17 Aug 2026 at 21:26, Prabhakar <prabhakar.csengg@xxxxxxxxx> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
>
> On the Renesas RZ/T2H SoC, the Watchdog Timer Control Register (WDTDCR)
> resides within the CPG/MSSR block rather than the WDT address space
> itself.
>
> Previously, this was handled by including a second register range in the
> "reg" property. However, this is architecturally incorrect as the CPG/MSSR
> block consists of two distinct regions (0x80280000 and 0x81280000) that
> contain registers for multiple peripheral blocks.
>
> Since the CPG/MSSR block is a multi-function block, introduce the
> "renesas,sysc" phandle-array property to allow the WDT driver to access
> its control register via this shared regmap.
>
> Mark the use of a second "reg" entry as deprecated in favor of the
> new phandle-array approach for SoCs that require WDTDCR access.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>

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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