Re: [PATCH v2 2/2] [RFC] CPUFreq: Add support for cpu-perf-dependencies

[Viresh Kumar]

On 24-09-20, 10:53, Nicola Mazzucato wrote:
> I am seeking some feedback/comments on the following approach.
> 
> Intro:
> Info of performance depency for cpus will be beneficial for systems
> where f/w description of the CPU performance control domain is different
> from the clock domain, e.g. per-CPU control with multiple CPUs sharing
> clock, and kernel OSPM s/w components need to take CPU performance
> dependency into account.
> Essentially these s/w components will have to be provided with
> this information from dt and this RFC is presenting a possible way
> to do so.

I am not sure I understand what performance control mean here. Can you please
elaborate a bit more on that ? For example, with current code and understanding,
a cpufreq policy belongs to a group of CPUs which change their frequency
together, which also mean that they change their performance level together and
so I am not able to understand what's going on here. Sorry about that.

What kind of hardware configuration doesn't work with this ?

-- 
viresh