netdev - Re: [PATCH 3/6] dt-bindings: clk: r9a07g044-cpg: Add entry for P0

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Date:   Fri, 16 Jul 2021 10:02:00 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-can@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH 3/6] dt-bindings: clk: r9a07g044-cpg: Add entry for
 P0_DIV2 core clock

Hi Geert,

On Fri, Jul 16, 2021 at 9:56 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Fri, Jul 16, 2021 at 10:45 AM Lad, Prabhakar
> <prabhakar.csengg@...il.com> wrote:
> > On Fri, Jul 16, 2021 at 9:08 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > On Thu, Jul 15, 2021 at 8:21 PM Lad Prabhakar
> > > <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > > > Add P0_DIV2 core clock required for CANFD module. CANFD core clock is
> > > > sourced from P0_DIV2 referenced from HW manual Rev.0.50.
> > >
> > > OK.
> > >
> > > > Also add R9A07G044_LAST_CORE_CLK entry to avoid changes in
> > > > r9a07g044-cpg.c file.
> > >
> > > I'm not so fond of adding this.  Unlike the other definitions, it is
> > > not really part of the bindings, but merely a convenience definition
> > > for the driver.  Furthermore it has to change when a new definition
> > > is ever added.
> > >
> > Agreed will drop this.
> >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> > > > ---
> > > >  include/dt-bindings/clock/r9a07g044-cpg.h | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > >
> > > > diff --git a/include/dt-bindings/clock/r9a07g044-cpg.h b/include/dt-bindings/clock/r9a07g044-cpg.h
> > > > index 0728ad07ff7a..2fd20db0b2f4 100644
> > > > --- a/include/dt-bindings/clock/r9a07g044-cpg.h
> > > > +++ b/include/dt-bindings/clock/r9a07g044-cpg.h
> > > > @@ -30,6 +30,8 @@
> > > >  #define R9A07G044_CLK_P2               19
> > > >  #define R9A07G044_CLK_AT               20
> > > >  #define R9A07G044_OSCCLK               21
> > > > +#define R9A07G044_CLK_P0_DIV2          22
> > > > +#define R9A07G044_LAST_CORE_CLK                23
> > >
> > > Third issue: off-by-one error, it should be 22 ;-)
> > >
> > 23 was intentionally as these numbers aren't used for core clock count
> > we use r9a07g044_core_clks[] instead.
>
> It ends up as an off-by-one bug in the range check in
> rzg2l_cpg_clk_src_twocell_get().
>
Ooops missed that!

Cheers,
Prabhakar

> > Said that I'll drop this.
>
> OK.
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> 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