[Query] CPUFreq: Does these machines have separate clock domains for CPUs?

Viresh Kumar viresh.kumar at linaro.org
Fri Aug 30 03:33:59 EDT 2013

On 30 August 2013 12:18, Magnus Damm <magnus.damm at gmail.com> wrote:
> Hi Viresh,
> On Thu, Aug 29, 2013 at 7:15 PM, Viresh Kumar <viresh.kumar at linaro.org> wrote:
>> Hi,
>> I have been doing some CPUFreq cleanup work and
>> wanted to know if the below mentioned machines have separate
>> clock domains for their CPUs or all share the same domain?
>> So, that we can use some generic routines for these drivers which
>> would eventually do:
>> cpumask_setall(policy->cpus);
>> And I wanted to make sure that this doesn't break them.. :)
>> ......
>> The drivers are:
> ...
>> drivers/cpufreq/sh-cpufreq.c
> ...
> The above SH cpufreq driver seems to be written with SMP in mind, but
> I would say SMP is a very rare case for SH. So I believe it can be
> considered as UP-only at this point. If Paul disagrees I'm quite sure
> he will tell us.

Okay.. The problem isn't really SMP but different clock domains for CPUs
in a SMP system..

So, even if we have a SMP SH machine, will it have same clock line for
all CPUs?

I will go with the change anyway..



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