linux-kernel - Re: [PATCH 4/7] clk: renesas: r9a08g045: Drop power domain instantiation

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Message-ID: <f3a0e26d-70ba-4f19-a10b-e60cb5a0bf6d@tuxon.dev>
Date: Fri, 9 May 2025 14:03:28 +0300
From: Claudiu Beznea <claudiu.beznea@...on.dev>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
 krzk+dt@...nel.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 4/7] clk: renesas: r9a08g045: Drop power domain
 instantiation

Hi, Geert,

On 07.05.2025 20:10, Geert Uytterhoeven wrote:
> Hi Claudiu,
> 
> On Thu, 10 Apr 2025 at 16:06, Claudiu <claudiu.beznea@...on.dev> wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Since the configuration order between the individual MSTOP and CLKON bits
>> cannot be preserved with the power domain abstraction, drop the power
>> domain instantiations.
>>
>> 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
>> @@ -192,59 +192,105 @@ static const struct cpg_core_clk r9a08g045_core_clks[] __initconst = {
>>  };
>>
>>  static const struct rzg2l_mod_clk r9a08g045_mod_clks[] = {
> 
>> +       DEF_MOD("dmac_aclk",            R9A08G045_DMAC_ACLK, R9A08G045_CLK_P3, 0x52c, 0,
>> +                                       MSTOP(BUS_REG1, BIT(2))),
>> +       DEF_MOD("dmac_pclk",            R9A08G045_DMAC_PCLK, CLK_P3_DIV2, 0x52c, 1,
>> +                                       MSTOP(BUS_REG1, BIT(3))),
> 
> The documentation is not very clear about the mapping to the 4 MSTOP
> bits related to DMA. Can you enlighten me?

I chose it like these thinking that the bits 0 and 1 are secure specific
variants of bits 2 and 3, thinking that they should be controlled from
secure world.

> 
>> @@ -294,78 +340,6 @@ static const unsigned int r9a08g045_crit_mod_clks[] __initconst = {
>>         MOD_CLK_BASE + R9A08G045_VBAT_BCLK,
>>  };
>>
>> -static const struct rzg2l_cpg_pm_domain_init_data r9a08g045_pm_domains[] = {
>> -       /* Keep always-on domain on the first position for proper domains registration. */
>> -       DEF_PD("always-on",     R9A08G045_PD_ALWAYS_ON,
>> -                               DEF_REG_CONF(0, 0),
>> -                               GENPD_FLAG_ALWAYS_ON | GENPD_FLAG_IRQ_SAFE),
>> -       DEF_PD("gic",           R9A08G045_PD_GIC,
>> -                               DEF_REG_CONF(CPG_BUS_ACPU_MSTOP, BIT(3)),
>> -                               GENPD_FLAG_ALWAYS_ON),
>> -       DEF_PD("ia55",          R9A08G045_PD_IA55,
>> -                               DEF_REG_CONF(CPG_BUS_PERI_CPU_MSTOP, BIT(13)),
>> -                               GENPD_FLAG_ALWAYS_ON),
>> -       DEF_PD("dmac",          R9A08G045_PD_DMAC,
>> -                               DEF_REG_CONF(CPG_BUS_REG1_MSTOP, GENMASK(3, 0)),
>> -                               GENPD_FLAG_ALWAYS_ON),
> 
> [...]
> 
>> -       DEF_PD("rtc",           R9A08G045_PD_RTC,
>> -                               DEF_REG_CONF(CPG_BUS_MCPU3_MSTOP, BIT(7)), 0),
> 
> These MSTOP bits are no longer controlled. Is that intentional?

No, that's a mistake from me. Thank you for pointing it.

Claudiu

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
>