linux-kernel - Re: [PATCH v2 09/10] clk: renesas: r9a08g045: Add the RZG2L_PD_F

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Date: Fri, 15 Mar 2024 07:45:26 +0200
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 magnus.damm@...il.com, linux-renesas-soc@...r.kernel.org,
 linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v2 09/10] clk: renesas: r9a08g045: Add the
 RZG2L_PD_F_CONSOLE flag to scif0 PM domain

Hi, Geert,

On 14.03.2024 18:06, Geert Uytterhoeven wrote:
> Hi Claudiu,
> 
> On Thu, Mar 7, 2024 at 3:08 PM Claudiu <claudiu.beznea@...on.dev> wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> The RZG2L_PD_F_CONSOLE is used by the rzg2l-cpg driver to check if the
>> SCIF domain need to be powered off in suspend. This is necessary when
>> no_console_suspend is available in bootargs as we want to still see
>> output on console, thus scif0 domain should remain powered on.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Thanks for your patch!
> 
>> --- a/drivers/clk/renesas/r9a08g045-cpg.c
>> +++ b/drivers/clk/renesas/r9a08g045-cpg.c
>> @@ -293,7 +293,7 @@ static const struct rzg2l_cpg_pm_domain_init_data r9a08g045_pm_domains[] = {
>>         DEF_PD("scif0",         R9A08G045_PD_SCIF0,
>>                                 DEF_REG_CONF(CPG_BUS_MCPU2_MSTOP, BIT(1)),
>>                                 DEF_REG_CONF(0, 0),
>> -                               RZG2L_PD_F_NONE),
>> +                               RZG2L_PD_F_CONSOLE),
> 
> This is not really correct: if SCIF0 is used as the console depends on the
> use case, i.e. on chosen/stdout-path.
> So this flag should be set at run-time. You can check the power-domains
> property of the node pointed to by of_stdout to find the PM Domain that
> holds the console, cfr. drivers/pmdomain/renesas/rmobile-sysc.c.

OK, I'll double check.

Thank you,
Claudiu Beznea

> 
>>  };
>>
>>  const struct rzg2l_cpg_info r9a08g045_cpg_info = {
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
>