linux-kernel - Re: [PATCH] clk: renesas: r9a07g044: Add WDT2 clocks to critical list

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Date:   Mon, 19 Sep 2022 14:37:50 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...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] clk: renesas: r9a07g044: Add WDT2 clocks to critical list

Hi Biju,

On Mon, Sep 19, 2022 at 2:35 PM Biju Das <biju.das.jz@...renesas.com> wrote:
>
> Hi Prabhakar,
>
> > Subject: [PATCH] clk: renesas: r9a07g044: Add WDT2 clocks to critical
> > list
> >
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Add the WDT2 clocks to r9a07g044_crit_mod_clks[] list as WDT CH2 is
> > specifically to check the operation of Cortex-M33 CPU on the RZ/{G2L,
> > G2LC, V2L} SoCs and we dont want to turn off the clocks of
> > WDT2 if it isn't enabled by Cortex-A55.
> >
> > This patch is in preparation to disable WDT CH2 from the RZ/G2L (alike
> > SoCs) DTS/I by default.
> >
> > Reported-by: Biju Das <biju.das.jz@...renesas.com>
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >  drivers/clk/renesas/r9a07g044-cpg.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/clk/renesas/r9a07g044-cpg.c
> > b/drivers/clk/renesas/r9a07g044-cpg.c
> > index 02a4fc41bb6e..cf9b1bd73792 100644
> > --- a/drivers/clk/renesas/r9a07g044-cpg.c
> > +++ b/drivers/clk/renesas/r9a07g044-cpg.c
> > @@ -412,6 +412,8 @@ static const unsigned int
> > r9a07g044_crit_mod_clks[] __initconst = {
> >       MOD_CLK_BASE + R9A07G044_GIC600_GICCLK,
> >       MOD_CLK_BASE + R9A07G044_IA55_CLK,
> >       MOD_CLK_BASE + R9A07G044_DMAC_ACLK,
> > +     MOD_CLK_BASE + R9A07G044_WDT2_PCLK,
> > +     MOD_CLK_BASE + R9A07G044_WDT2_CLK,
>
> Do we need to turn on this clock unnecessarily?
>
No, this is in preparation to disable WDT2 by default from RZ/G2L{C} DTS/I.

Cheers,
Prabhakar