linux-kernel - Re: [PATCH 2/3] soc: c3: Add support for power domains controller

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Message-ID: <37fe4ab3-323d-f025-5168-352b054faf8b@amlogic.com>
Date:   Tue, 4 Jul 2023 10:20:52 +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 2/3] soc: c3: Add support for power domains controller

Hi Neil,
     Thanks for your reply.

On 2023/7/3 21:29, Neil Armstrong wrote:
> [ EXTERNAL EMAIL ]
> 
> Hi,
> 
> On 03/07/2023 11:31, =Xianwei Zhao wrote:
>> From: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>
>> Add support for C3 Power controller. C3 power control
>> registers are in secure domain, and should be accessed by SMC.
>>
>> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
>> ---
>>   drivers/soc/amlogic/meson-secure-pwrc.c | 28 ++++++++++++++++++++++++-
>>   1 file changed, 27 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/soc/amlogic/meson-secure-pwrc.c 
>> b/drivers/soc/amlogic/meson-secure-pwrc.c
>> index 25b4b71df9b8..39ccc8f2e630 100644
>> --- a/drivers/soc/amlogic/meson-secure-pwrc.c
>> +++ b/drivers/soc/amlogic/meson-secure-pwrc.c
>> @@ -12,6 +12,7 @@
>>   #include <linux/pm_domain.h>
>>   #include <dt-bindings/power/meson-a1-power.h>
>>   #include <dt-bindings/power/meson-s4-power.h>
>> +#include <dt-bindings/power/amlogic-c3-power.h>
>>   #include <linux/arm-smccc.h>
>>   #include <linux/firmware/meson/meson_sm.h>
>>   #include <linux/module.h>
>> @@ -132,6 +133,22 @@ static struct meson_secure_pwrc_domain_desc 
>> s4_pwrc_domains[] = {
>>       SEC_PD(S4_AUDIO,        0),
>>   };
>>
>> +static struct meson_secure_pwrc_domain_desc c3_pwrc_domains[] = {
>> +     SEC_PD(C3_NNA,  0),
>> +     SEC_PD(C3_AUDIO,        GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_SDIOA,        GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_EMMC, GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_USB_COMB, GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_SDCARD,       GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_ETH,  GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_GE2D, GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_CVE,  GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_GDC_WRAP,     GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_ISP_TOP,              GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_MIPI_ISP_WRAP, GENPD_FLAG_ALWAYS_ON),
>> +     SEC_PD(C3_VCODEC,       0),
>> +};
> 
> Please move this struct before _s4_
> 
Will do.
>> +
>>   static int meson_secure_pwrc_probe(struct platform_device *pdev)
>>   {
>>       int i;
>> @@ -179,7 +196,7 @@ static int meson_secure_pwrc_probe(struct 
>> platform_device *pdev)
>>       for (i = 0 ; i < match->count ; ++i) {
>>               struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
>>
>> -             if (!match->domains[i].index)
>> +             if (!match->domains[i].name)
> 
> Is this change necessary ? If yes please move it to another patch
> and explain it's purpose. If it fixes something, add a Fixes tag so
> it can be backported.
> 
This variable for C3 could be equal to zero. I will move it to another 
patch.
> Thanks,
> Neil
> 
>>                       continue;
>>
>>               dom->pwrc = pwrc;
>> @@ -207,6 +224,11 @@ static struct meson_secure_pwrc_domain_data 
>> meson_secure_s4_pwrc_data = {
>>       .count = ARRAY_SIZE(s4_pwrc_domains),
>>   };
>>
>> +static struct meson_secure_pwrc_domain_data 
>> amlogic_secure_c3_pwrc_data = {
>> +     .domains = c3_pwrc_domains,
>> +     .count = ARRAY_SIZE(c3_pwrc_domains),
>> +};
> 
> Please move this struct before _s4_
> 
>> +
>>   static const struct of_device_id meson_secure_pwrc_match_table[] = {
>>       {
>>               .compatible = "amlogic,meson-a1-pwrc",
>> @@ -216,6 +238,10 @@ static const struct of_device_id 
>> meson_secure_pwrc_match_table[] = {
>>               .compatible = "amlogic,meson-s4-pwrc",
>>               .data = &meson_secure_s4_pwrc_data,
>>       },
>> +     {
>> +             .compatible = "amlogic,c3-pwrc",
>> +             .data = &amlogic_secure_c3_pwrc_data,
>> +     },
> 
> Please move this entry before _s4_Will do.
> 
>>       { /* sentinel */ }
>>   };
>>   MODULE_DEVICE_TABLE(of, meson_secure_pwrc_match_table);
> 
> Thanks,
> Neil
>