linux-kernel - Re: [PATCH V2 2/6] soc: amlogic: add driver to support power parent node

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Date:   Thu, 24 Aug 2023 16:42:59 +0800
From:   Xianwei Zhao <xianwei.zhao@...ogic.com>
To:     neil.armstrong@...aro.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>
Subject: Re: [PATCH V2 2/6] soc: amlogic: add driver to support power parent
 node

Hi Neil,
    Thanks for your reply.

On 2023/8/24 16:27, Neil Armstrong wrote:
> [ EXTERNAL EMAIL ]
> 
> Hi,
> 
> On 24/08/2023 07:59, Xianwei Zhao wrote:
>> From: "xianwei.zhao" <xianwei.zhao@...ogic.com>
>>
>> Some power domains depends on other domains, Such as Amlogic T7 SoC.
>> Add parent node to support this case.
>>
>> Signed-off-by: xianwei.zhao <xianwei.zhao@...ogic.com>
>> ---
>> V1 -> V2: None
>> ---
>>   drivers/genpd/amlogic/meson-secure-pwrc.c | 26 ++++++++++++++++++++++-
>>   1 file changed, 25 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/genpd/amlogic/meson-secure-pwrc.c 
>> b/drivers/genpd/amlogic/meson-secure-pwrc.c
>> index 5ac2437ab8ad..76527f4946b4 100644
>> --- a/drivers/genpd/amlogic/meson-secure-pwrc.c
>> +++ b/drivers/genpd/amlogic/meson-secure-pwrc.c
>> @@ -19,10 +19,12 @@
>>
>>   #define PWRC_ON             1
>>   #define PWRC_OFF    0
>> +#define PWRC_NO_PARENT  ((1UL << (sizeof(unsigned int) * 8)) - 1)
> 
> This is fishy, just use UINT_MAX
Will do, use UINT_MAX define (~0U).
> 
>>
>>   struct meson_secure_pwrc_domain {
>>       struct generic_pm_domain base;
>>       unsigned int index;
>> +     unsigned int parent;
>>       struct meson_secure_pwrc *pwrc;
>>   };
>>
>> @@ -34,6 +36,7 @@ struct meson_secure_pwrc {
>>
>>   struct meson_secure_pwrc_domain_desc {
>>       unsigned int index;
>> +     unsigned int parent;
>>       unsigned int flags;
>>       char *name;
>>       bool (*is_off)(struct meson_secure_pwrc_domain *pwrc_domain);
>> @@ -90,8 +93,19 @@ static int meson_secure_pwrc_on(struct 
>> generic_pm_domain *domain)
>>   {                                           \
>>       .name = #__name,                        \
>>       .index = PWRC_##__name##_ID,            \
>> -     .is_off = pwrc_secure_is_off,   \
>> +     .is_off = pwrc_secure_is_off,           \
>>       .flags = __flag,                        \
>> +     .parent = PWRC_NO_PARENT,               \
>> +}
>> +
>> +#define TOP_PD(__name, __flag, __parent)     \
>> +[PWRC_##__name##_ID] =                               \
>> +{                                            \
>> +     .name = #__name,                        \
>> +     .index = PWRC_##__name##_ID,            \
>> +     .is_off = pwrc_secure_is_off,           \
>> +     .flags = __flag,                        \
>> +     .parent = __parent,                     \
>>   }
>>
>>   static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
>> @@ -202,6 +216,7 @@ static int meson_secure_pwrc_probe(struct 
>> platform_device *pdev)
>>
>>               dom->pwrc = pwrc;
>>               dom->index = match->domains[i].index;
>> +             dom->parent = match->domains[i].parent;
>>               dom->base.name = match->domains[i].name;
>>               dom->base.flags = match->domains[i].flags;
>>               dom->base.power_on = meson_secure_pwrc_on;
>> @@ -212,6 +227,15 @@ static int meson_secure_pwrc_probe(struct 
>> platform_device *pdev)
>>               pwrc->xlate.domains[i] = &dom->base;
>>       }
>>
>> +     for (i = 0; i < match->count; i++) {
>> +             struct meson_secure_pwrc_domain *dom = pwrc->domains;
>> +
>> +             if (!match->domains[i].name || match->domains[i].parent 
>> == PWRC_NO_PARENT)
>> +                     continue;
>> +
>> +             pm_genpd_add_subdomain(&dom[dom[i].parent].base, 
>> &dom[i].base);
>> +     }
>> +
>>       return of_genpd_add_provider_onecell(pdev->dev.of_node, 
>> &pwrc->xlate);
>>   }
>>
>