linux-kernel - Re: [PATCH 1/2] cpufreq-dt: check CPU clock/power domain during initializing

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Date:	Tue, 20 Jan 2015 15:33:14 +0800
From:	Pi-Cheng Chen <pi-cheng.chen@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mike Turquette <mturquette@...aro.org>,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>
Subject: Re: [PATCH 1/2] cpufreq-dt: check CPU clock/power domain during initializing

Hi Viresh,

Thanks for reviewing.

On 19 January 2015 at 16:00, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 9 January 2015 at 15:24, pi-cheng.chen <pi-cheng.chen@...aro.org> wrote:
>> Currently the DT based cpufreq driver is missing some way to check which
>> CPUs share clocks. In the 1st patch, CPU clock/power domain information is
>> added to the platform_data of cpufreq-dt so that cpufreq-dt driver could
>> check which CPUs share clock/power.
>>
>> Signed-off-by: pi-cheng.chen <pi-cheng.chen@...aro.org>
>> ---
>>  drivers/cpufreq/cpufreq-dt.c | 15 +++++++++++++++
>>  include/linux/cpufreq-dt.h   |  6 ++++++
>>  2 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
>> index fde97d6..ff8c266 100644
>> --- a/drivers/cpufreq/cpufreq-dt.c
>> +++ b/drivers/cpufreq/cpufreq-dt.c
>> @@ -296,6 +296,21 @@ static int cpufreq_init(struct cpufreq_policy *policy)
>>         pd = cpufreq_get_driver_data();
>>         if (!pd || !pd->independent_clocks)
>>                 cpumask_setall(policy->cpus);
>> +       else if (pd && !list_empty(&pd->domain_list)) {
>> +               struct list_head *domain_node;
>> +
>> +               list_for_each(domain_node, &pd->domain_list) {
>> +                       struct cpufreq_cpu_domain *domain;
>
> Define this with domain_node.
>

Will do it.

>> +
>> +                       domain = container_of(domain_node,
>> +                                             struct cpufreq_cpu_domain, node);
>> +                       if (!cpumask_test_cpu(policy->cpu, &domain->cpus))
>> +                               continue;
>> +
>> +                       cpumask_copy(policy->cpus, &domain->cpus);
>> +                       break;
>> +               }
>> +       }
>>
>>         of_node_put(np);
>>
>> diff --git a/include/linux/cpufreq-dt.h b/include/linux/cpufreq-dt.h
>> index 0414009..92bffd3 100644
>> --- a/include/linux/cpufreq-dt.h
>> +++ b/include/linux/cpufreq-dt.h
>> @@ -10,6 +10,11 @@
>>  #ifndef __CPUFREQ_DT_H__
>>  #define __CPUFREQ_DT_H__
>>
>> +struct cpufreq_cpu_domain {
>> +       struct list_head node;
>> +       cpumask_t cpus;
>> +};
>> +
>>  struct cpufreq_dt_platform_data {
>>         /*
>>          * True when each CPU has its own clock to control its
>> @@ -17,6 +22,7 @@ struct cpufreq_dt_platform_data {
>>          * clock.
>>          */
>>         bool independent_clocks;
>> +       struct list_head domain_list;
>>  };
>
> Though we need to keep only one of these two, but I don't think
> any of these will stay for long time. So, its okay..
>
> Looks fine. Thanks.

Thanks.
I will also try to add intermediate frequency support in next version.
BTW, do you think it's a good idea to add a new device tree binding like
intermediate_clock = <&clksys MAINPLL>
and so that cpufreq-dt could get the intermediate clock?

Best Regards,
Pi-Cheng
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