linux-kernel - Re: [PATCH 10/17] clk: renesas: r9a08g045: Add support for power domains

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Message-ID: <1a3c9ec5-69b9-4f55-bdf6-628fcf2b0268@tuxon.dev>
Date: Wed, 21 Feb 2024 15:35:35 +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, paul.walmsley@...ive.com, palmer@...belt.com,
 aou@...s.berkeley.edu, linux-renesas-soc@...r.kernel.org,
 linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 10/17] clk: renesas: r9a08g045: Add support for power
 domains

Hi, Geert,

On 16.02.2024 16:10, Geert Uytterhoeven wrote:
> Hi Claudiu,
> 
> On Thu, Feb 8, 2024 at 1:44 PM Claudiu <claudiu.beznea@...on.dev> wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Instantiate power domains for the currently enabled IPs of R9A08G045 SoC.
>>
>> 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
>> @@ -240,6 +240,28 @@ static const unsigned int r9a08g045_crit_mod_clks[] __initconst = {
>>         MOD_CLK_BASE + R9A08G045_DMAC_ACLK,
>>  };
>>
>> +static const struct rzg2l_cpg_pm_domain_init_data r9a08g045_pm_domains[] = {
>> +       DEF_PD("always-on",     R9A08G045_PD_ALWAYS_ON, 0, 0,
>> +                               RZG2L_PD_F_PARENT | RZG2L_PD_F_ALWAYS_ON),
>> +       DEF_PD("gic",           R9A08G045_PD_GIC, MSTOP(ACPU, BIT(3)), PWRDN(IP1, 2),
> 
> My docs document only bit 0 of the CPG_BUS_ACPU_MSTOP register.

Indeed, mine, too. I took as reference the table "Registers for Module
Standby Mode". I asked for clarifications. The TF-A software also uses
BIT(3) for setting this.

> 
>> +                               RZG2L_PD_F_ALWAYS_ON),
>> +       DEF_PD("ia55",          R9A08G045_PD_IA55, MSTOP(PERI_CPU, BIT(13)), PWRDN(IP1, 3),
>> +                               RZG2L_PD_F_ALWAYS_ON),
>> +       DEF_PD("dmac",          R9A08G045_PD_DMAC, MSTOP(REG1, GENMASK(3, 0)), 0,
>> +                               RZG2L_PD_F_ALWAYS_ON),
>> +       DEF_PD("ddr",           R9A08G045_PD_DDR, MSTOP(PERI_DDR, BIT(1)), PWRDN(IP2, 0),
> 
> Only BIT(1)? My docs suggest GENMASK(1, 0).

I wanted to keep PHY separated but there's no reason for doing that,
AFAICT. I'll update it.

> 
>> +                               RZG2L_PD_F_ALWAYS_ON),
>> +       DEF_PD("tzcddr",        R9A08G045_PD_TZCDDR, MSTOP(TZCDDR, GENMASK(2, 0)),
>> +                               PWRDN(IP2, 1), RZG2L_PD_F_ALWAYS_ON),
>> +       DEF_PD("otfde_ddr",     R9A08G045_PD_OTFDE_DDR, 0, PWRDN(IP2, 2), RZG2L_PD_F_ALWAYS_ON),
> 
> MSTOP(PERI_CPU2, BIT(2))?

OK.

Thank you,
Claudiu Beznea

> 
>> +       DEF_PD("sdhi0",         R9A08G045_PD_SDHI0, MSTOP(PERI_COM, BIT(0)), PWRDN(IP1, 13), 0),
>> +       DEF_PD("sdhi1",         R9A08G045_PD_SDHI1, MSTOP(PERI_COM, BIT(1)), PWRDN(IP1, 14), 0),
>> +       DEF_PD("sdhi2",         R9A08G045_PD_SDHI2, MSTOP(PERI_COM, BIT(11)), PWRDN(IP1, 15), 0),
>> +       DEF_PD("eth0",          R9A08G045_PD_ETHER0, MSTOP(PERI_COM, BIT(2)), PWRDN(IP1, 11), 0),
>> +       DEF_PD("eth1",          R9A08G045_PD_ETHER1, MSTOP(PERI_COM, BIT(3)), PWRDN(IP1, 12), 0),
>> +       DEF_PD("scif0",         R9A08G045_PD_SCIF0, MSTOP(MCPU2, BIT(1)), 0, 0),
>> +};
>> +
> 
> The rest LGTM.
> 
> 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