linux-kernel - Re: [PATCH v3 05/10] clk: renesas: r8a779h0: Add display clocks

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Message-ID: <CAMuHMdUmAbnbJ-UouN+dnodVg7+Lw47to-O4rTAcDanQ=NCGpg@mail.gmail.com>
Date: Mon, 9 Dec 2024 08:49:18 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
	Kieran Bingham <kieran.bingham+renesas@...asonboard.com>, 
	Andrzej Hajda <andrzej.hajda@...el.com>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Robert Foss <rfoss@...nel.org>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	LUU HOAI <hoai.luu.ub@...esas.com>, Jagan Teki <jagan@...rulasolutions.com>, 
	Sam Ravnborg <sam@...nborg.org>, Biju Das <biju.das.jz@...renesas.com>, 
	dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>, linux-clk@...r.kernel.org, 
	Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Subject: Re: [PATCH v3 05/10] clk: renesas: r8a779h0: Add display clocks

Hi Tomi,

On Mon, Dec 9, 2024 at 6:26 AM Tomi Valkeinen
<tomi.valkeinen@...asonboard.com> wrote:
> On 06/12/2024 15:43, Geert Uytterhoeven wrote:
> > On Fri, Dec 6, 2024 at 10:33 AM Tomi Valkeinen
> > <tomi.valkeinen@...asonboard.com> wrote:
> >> From: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> >>
> >> Add display related clocks for DU, DSI, FCPVD, and VSPD.
> >>
> >> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> >> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> >> Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > i.e. will queue in renesas-clk for v6.14.
> >
> >> --- a/drivers/clk/renesas/r8a779h0-cpg-mssr.c
> >> +++ b/drivers/clk/renesas/r8a779h0-cpg-mssr.c
> >> @@ -179,6 +179,9 @@ static const struct mssr_mod_clk r8a779h0_mod_clks[] __initconst = {
> >>          DEF_MOD("canfd0",       328,    R8A779H0_CLK_SASYNCPERD2),
> >>          DEF_MOD("csi40",        331,    R8A779H0_CLK_CSI),
> >>          DEF_MOD("csi41",        400,    R8A779H0_CLK_CSI),
> >> +       DEF_MOD("dis0",         411,    R8A779H0_CLK_S0D3),
> >> +       DEF_MOD("dsitxlink0",   415,    R8A779H0_CLK_DSIREF),
> >> +       DEF_MOD("fcpvd0",       508,    R8A779H0_CLK_S0D3),
> >>          DEF_MOD("hscif0",       514,    R8A779H0_CLK_SASYNCPERD1),
> >>          DEF_MOD("hscif1",       515,    R8A779H0_CLK_SASYNCPERD1),
> >>          DEF_MOD("hscif2",       516,    R8A779H0_CLK_SASYNCPERD1),
> >> @@ -227,6 +230,7 @@ static const struct mssr_mod_clk r8a779h0_mod_clks[] __initconst = {
> >>          DEF_MOD("vin15",        811,    R8A779H0_CLK_S0D4_VIO),
> >>          DEF_MOD("vin16",        812,    R8A779H0_CLK_S0D4_VIO),
> >>          DEF_MOD("vin17",        813,    R8A779H0_CLK_S0D4_VIO),
> >> +       DEF_MOD("vspd0",        830,    R8A779H0_CLK_S0D1_VIO),
> >>          DEF_MOD("wdt1:wdt0",    907,    R8A779H0_CLK_R),
> >>          DEF_MOD("cmt0",         910,    R8A779H0_CLK_R),
> >>          DEF_MOD("cmt1",         911,    R8A779H0_CLK_R),
> >
> > As mentioned by Laurent during his review on v1, all clock parents
> > should probably be some form of R8A779H0_CLK_S0Dx_VIO.
> > So I'm inclined to replace all of them by R8A779H0_CLK_VIOBUSD2 while
> > applying, which would match R-Car V4H.
>
> What do you mean with the above? First you say the clock parents should
> be some form of S0Dx_VIO, but then you say you'll use VIOBUSD2. Aren't
> those unrelated clocks, from different PLLs?

Oops, copy-'n-paste went wrong. I did mean R8A779H0_VIOBUSD*.

> > Are you OK with that?
>
> I'm fine with that. I can't really get much out of the docs wrt.
> clocking, and the clocks I used were from the BSP. Afaics, it looks
> similar to V4H, so it's probably best have the same clocks, as you suggest.

Agreed.

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