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

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Message-ID: <b0fffc87-a72e-4041-b3f6-7f2a4987916e@ideasonboard.com>
Date: Mon, 9 Dec 2024 07:26:41 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
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,

On 06/12/2024 15:43, Geert Uytterhoeven wrote:
> Hi Tomi,
> 
> 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?

> 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.

  Tomi