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

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Message-ID: <20241209214035.GB26531@pendragon.ideasonboard.com>
Date: Mon, 9 Dec 2024 23:40:35 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Tomi Valkeinen <tomi.valkeinen@...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,
	linux-clk@...r.kernel.org,
	Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Subject: Re: [PATCH v3 05/10] clk: renesas: r8a779h0: Add display clocks

On Mon, Dec 09, 2024 at 08:49:18AM +0100, Geert Uytterhoeven wrote:
> On Mon, Dec 9, 2024 at 6:26 AM Tomi Valkeinen wrote:
> > On 06/12/2024 15:43, Geert Uytterhoeven wrote:
> > > On Fri, Dec 6, 2024 at 10:33 AM Tomi Valkeinen 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.

Works for me too.

-- 
Regards,

Laurent Pinchart