RE: [PATCH v2 2/3] arm64: dts: renesas: r9a09g057: Remove wdt{0,2,3} nodes

[Fabrizio Castro]

Hi Geert,

Thanks for your reply.

> From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Sent: 03 March 2026 13:29
> To: Fabrizio Castro <fabrizio.castro.jz@xxxxxxxxxxx>
> Cc: Rob Herring <robh@xxxxxxxxxx>; Guenter Roeck <linux@xxxxxxxxxxxx>; Michael Turquette
> <mturquette@xxxxxxxxxxxx>; Stephen Boyd <sboyd@xxxxxxxxxx>; Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>;
> Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>; Geert Uytterhoeven <geert+renesas@xxxxxxxxx>; Conor Dooley
> <conor+dt@xxxxxxxxxx>; magnus.damm <magnus.damm@xxxxxxxxx>; Prabhakar Mahadev Lad <prabhakar.mahadev-
> lad.rj@xxxxxxxxxxxxxx>; linux-watchdog@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-renesas-
> soc@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-clk@xxxxxxxxxxxxxxx; Biju Das
> <biju.das.jz@xxxxxxxxxxxxxx>
> Subject: Re: [PATCH v2 2/3] arm64: dts: renesas: r9a09g057: Remove wdt{0,2,3} nodes
> 
> Hi Fabrizio,
> 
> On Tue, 3 Feb 2026 at 13:43, Fabrizio Castro
> <fabrizio.castro.jz@xxxxxxxxxxx> wrote:
> > The HW user manual for the Renesas RZ/V2H(P) SoC (a.k.a r9a09g057)
> > states that only WDT1 is supposed to be accessed by the CA55 cores.
> > WDT0 is supposed to be used by the CM33 core, WDT2 is supposed
> > to be used by the CR8 core 0, and WDT3 is supposed to be used
> > by the CR8 core 1.
> >
> > Remove wdt{0,2,3} from the SoC specific device tree to make it
> > compliant with the specification from the HW manual.
> >
> > This change is harmless as there are currently no users of the
> > wdt{0,2,3} device tree nodes, only the wdt1 node is actually used.
> >
> > Fixes: 095105496e7d ("arm64: dts: renesas: r9a09g057: Add WDT0-WDT3 nodes")
> > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@xxxxxxxxxxx>
> 
> Thanks for your patch!
> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> i.e. will queue in renesas-fixes for v7.0.

Thanks!

> 
> Apparently the same applies to RZ/V2N.  Shall I just apply this patch
> to arch/arm64/boot/dts/renesas/r9a09g056.dtsi, too, with the SoC name
> and part numbers updated, and
> 
>     Fixes: 7db958983c8dd14d ("arm64: dts: renesas: r9a09g056: Add
> WDT0-WDT3 nodes")
> 
> ?

The manual for the Renesas RZ/V2N is not super clear on this matter,
I am waiting for further clarification.

I'll send another series for the RZ/V2N if appropriate, therefore let's
keep RZ/V2N as-is for now.

Thanks!

Fab

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
> 
> 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