linux-kernel - Re: [PATCH 4/6] clk: renesas: r8a779a0: Add VIN[00-31] clocks

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Date:   Thu, 15 Oct 2020 18:30:03 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] clk: renesas: r8a779a0: Add VIN[00-31] clocks

Hi Jacopo,

On Thu, Oct 15, 2020 at 9:32 AM Jacopo Mondi <jacopo@...ndi.org> wrote:
> On Wed, Oct 14, 2020 at 09:55:32PM +0300, Sergei Shtylyov wrote:
> > On 10/14/20 12:44 PM, Jacopo Mondi wrote:
> > > Add clock definitions of the VIN instances for R-Car V3U.
> > >
> > > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> > >
> > > ---
> > > Clocks at indexes 730 and 731 are named 'vin0' and 'vin1'.
> > > I assumed it's a typographic error and renamed them 'vin00' and 'vin01'
> > > ---
> > >  drivers/clk/renesas/r8a779a0-cpg-mssr.c | 32 +++++++++++++++++++++++++
> > >  1 file changed, 32 insertions(+)
> > >
> > > diff --git a/drivers/clk/renesas/r8a779a0-cpg-mssr.c b/drivers/clk/renesas/r8a779a0-cpg-mssr.c
> > > index bd54a28c50ee..2a00eb82013f 100644
> > > --- a/drivers/clk/renesas/r8a779a0-cpg-mssr.c
> > > +++ b/drivers/clk/renesas/r8a779a0-cpg-mssr.c
> > > @@ -149,6 +149,38 @@ static const struct mssr_mod_clk r8a779a0_mod_clks[] __initconst = {
> > >     DEF_MOD("scif1",        703,    R8A779A0_CLK_S1D8),
> > >     DEF_MOD("scif3",        704,    R8A779A0_CLK_S1D8),
> > >     DEF_MOD("scif4",        705,    R8A779A0_CLK_S1D8),
> > > +   DEF_MOD("vin00",        730,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin01",        731,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin02",        800,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin03",        801,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin04",        802,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin05",        803,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin06",        804,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin07",        805,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin10",        806,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin11",        807,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin12",        808,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin13",        809,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin14",        810,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin15",        811,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin16",        812,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin17",        813,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin20",        814,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin21",        815,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin22",        816,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin23",        817,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin24",        818,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin25",        819,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin26",        820,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin27",        821,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin30",        822,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin31",        823,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin32",        824,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin33",        825,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin34",        826,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin35",        827,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin36",        828,    R8A779A0_CLK_S1D1),
> > > +   DEF_MOD("vin37",        829,    R8A779A0_CLK_S1D1),
>
> >    The subject says VIN[0-31]?
>
> There are 32 VIN instances (hence the [0-31] in the subject), grouped
> in 4 units of 8 channels each.
>
> I can drop the [0-31] in the subject if it's confusing.

The VIN naming in the R-Car V3U documentation is very confusing.
E.g. all of the following are used, and refer to the same channel:
  1. VIN37,
  2. VIN31,
  3. vin3 ch7.

Looks good to me, but I cannot verify the parent clocks
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

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