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

Hi Geert,

From: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Sent: 01 March 2021 15:01
Subject: RE: [PATCH 2/7] clk: renesas: r8a77965: Add DAB clock

Hi Laurent,

Thanks for your feedback!

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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Sent: 26 February 2021 12:49
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:

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On Thu, Feb 25, 2021 at 11:53 PM Fabrizio Castro wrote:

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This patch adds the DAB clock to the R8A77965 SoC.

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

Thanks for your patch!

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--- 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 = {

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        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

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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.

I hear you, but you know how these sort of things go, a bit was left
behind, now they are aware of this bit missing from the documentation
and at some point they will release a document addressing this particular
point. Meanwhile, we have received written confirmation for this, so
it should be okay.

I think this patch is worth taking.

Thanks,
Fab

Thanks,
Fab

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        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