linux-kernel - RE: [PATCH] arm64: dts: renesas: rzg2ul-smarc-som: Drop enabling wdt2

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Date:   Mon, 19 Sep 2022 10:15:20 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH] arm64: dts: renesas: rzg2ul-smarc-som: Drop enabling wdt2

Hi Geert,

Prabhakar Mahadev Lad <prabhakar.mahadev-
> lad.rj@...renesas.com>
> Subject: Re: [PATCH] arm64: dts: renesas: rzg2ul-smarc-som: Drop
> enabling wdt2
> 
> Hi Biju,
> 
> On Mon, Sep 19, 2022 at 12:06 PM Biju Das <biju.das.jz@...renesas.com>
> wrote:
> > > On Sun, Sep 18, 2022 at 10:04 AM Geert Uytterhoeven <geert@...ux-
> > > m68k.org> wrote:
> > > > On Wed, Sep 14, 2022 at 3:43 PM Prabhakar
> > > <prabhakar.csengg@...il.com> wrote:
> > > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > >
> > > > > WDT CH2 is specifically to check the operation of Cortex-M33
> CPU
> > > so
> > > > > don't enable WDT2 by default.
> > > > >
> > > For consistency I'll drop enabling WDT2 from the RZ/G2L{C} too.
> >
> > Does remove unused clocks turn off WDT2 clock during late init??
> >
> > If that is the case, we should remove entries from clock table as
> well?
> 
> Or add it to *_crit_mod_clks[]?
> 
> Note that drivers/clk/renesas/r9a07g043-cpg.c creates wdt2 clocks and
> resets, so that should probably be moved inside the #ifdef
> CONFIG_ARM64 section.

Yes, both will do, I guess otherwise WDT enabled by Cortex-M33 will be disabled by
CORTEX-A55 during boot.

Cheers,
Biju