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Date:   Mon, 18 May 2020 10:16:06 +0100
From:   "Lad, Prabhakar" <>
To:     Wolfram Sang <>
Cc:     Lad Prabhakar <>,
        Geert Uytterhoeven <>,
        Jens Axboe <>, Rob Herring <>,
        Wolfram Sang <>,
        Ulf Hansson <>,
        Sergei Shtylyov <>,
        "David S. Miller" <>,
        Wim Van Sebroeck <>,
        Guenter Roeck <>,,
        <>, LKML <>,,
        Linux MMC List <>,
        netdev <>,
        Linux-Renesas <>,
Subject: Re: [PATCH 17/17] ARM: dts: r8a7742: Add RWDT node

Hi Wolfram,

On Sun, May 17, 2020 at 10:08 PM Wolfram Sang <> wrote:
> On Fri, May 15, 2020 at 04:08:57PM +0100, Lad Prabhakar wrote:
> > Add a device node for the Watchdog Timer (RWDT) controller on the Renesas
> > RZ/G1H (r8a7742) SoC.
> >
> > Signed-off-by: Lad Prabhakar <>
> > Reviewed-by: Marian-Cristian Rotariu <>
> The DTS change looks fine, I checked it against similar SoCs (like the
> previous patched). So, for that:
> Reviewed-by: Wolfram Sang <>
Thank you for review.

> However, just to make sure, have you checked the WDT (especially reboot)
> with SMP and multiple CPU cores enabled? Some early Gen2 SoCs had issues
> there.
Its similar to as seen on Rcar-H2 where just the A15 cores are up and
A7 cores fail to boot. Attached is the boot log where reboot works as
expected with all A15 core up. Although I have tested the internal
release based on 3.10 where all the cores are up which used bootarg
apmu=multicluster ( So
there is some work involved to get all the A7's up and running.


View attachment "log.txt" of type "text/plain" (25436 bytes)

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