RE: [PATCH 2/7] clk: renesas: r8a77965: Add DAB clock

Hi Geert,


Thanks for your feedback!

From: Geert Uytterhoeven <geert@linux-m68k.org>
Sent: 26 February 2021 08:45
Subject: Re: [PATCH 2/7] clk: renesas: r8a77965: Add DAB clock

Hi Fabrizio,

On Thu, Feb 25, 2021 at 11:53 PM Fabrizio Castro
[off-list ref] wrote:

quoted

This patch adds the DAB clock to the R8A77965 SoC.

Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>

Thanks for your patch!

quoted

--- 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 = {

quoted

        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 had the same concerns but we have received confirmation for this.
Hopefully an official document will be released soon.

Thanks,
Fab

quoted

        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)),

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-
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