linux-kernel - Re: [PATCH 2/7] clk: renesas: r8a77965: Add DAB clock

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Message-ID: <YDjuMRkU+g52I1gm@pendragon.ideasonboard.com>
Date:   Fri, 26 Feb 2021 14:48:49 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Dirk Behme <Dirk.Behme@...bosch.com>,
        Peter Erben <Peter.Erben@...bosch.com>
Subject: Re: [PATCH 2/7] clk: renesas: r8a77965: Add DAB clock

Hi Fabrizio,

Thank you for the patch.

On Fri, Feb 26, 2021 at 09:45:20AM +0100, Geert Uytterhoeven wrote:
> On Thu, Feb 25, 2021 at 11:53 PM Fabrizio Castro wrote:
> > This patch adds the DAB clock to the R8A77965 SoC.
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> 
> Thanks for your patch!
> 
> > --- a/drivers/clk/renesas/r8a77965-cpg-mssr.c
> > +++ b/drivers/clk/renesas/r8a77965-cpg-mssr.c
> > @@ -250,6 +250,7 @@ static const struct mssr_mod_clk r8a77965_mod_clks[] __initconst = {
> >         DEF_MOD("ssi2",                 1013,   MOD_CLK_ID(1005)),
> >         DEF_MOD("ssi1",                 1014,   MOD_CLK_ID(1005)),
> >         DEF_MOD("ssi0",                 1015,   MOD_CLK_ID(1005)),
> > +       DEF_MOD("dab",                  1016,   R8A77965_CLK_S0D6),
> 
> Unfortunately this bit is not documented in the R-Car Gen3 Hardware
> User's Manual, so I have to trust you on this.
> 
> While it's not unusual that the same module on R-Car E3 and M3-N
> has different parent clocks, it does strike me as odd that S0D6 on M3-N
> runs at 133 MHz, while S3D1 on E3 runs at 266 MHz.
> Probably it doesn't matter that much, as your driver doesn't care
> about the actual clock rate.

I have the exact same concerns, here and for 1/7.

> >         DEF_MOD("scu-all",              1017,   R8A77965_CLK_S3D4),
> >         DEF_MOD("scu-dvc1",             1018,   MOD_CLK_ID(1017)),
> >         DEF_MOD("scu-dvc0",             1019,   MOD_CLK_ID(1017)),

-- 
Regards,

Laurent Pinchart