Re: [RFC PATCH 0/4] cpufreq: qcom-hw: Move clocks to CPU node

[Manivannan Sadhasivam <mani@kernel.org>]

On Tue, Aug 30, 2022 at 11:10:42AM +0530, Viresh Kumar wrote:
> On 29-08-22, 22:24, Bjorn Andersson wrote:
> > Conceptually, it sounds like a good idea to express the clock feeding
> > the CPU clusters, which is controlled by the OSM/EPSS.  But do you
> > expect the OPP framework to actually do something with the clock, or
> > just to ensure that the relationship is properly described?
> 
> No, the OPP core will never try to set the clock rate in your case,
> though it will do clk_get().
> 

Okay. Then I think it is a fair argument to make qcom-cpufreq-hw as the
clock provider for CPUs.

I will send the RFC soon.

Thanks,
Mani

> > FWIW, the possible discrepancy between the requested frequency and the
> > actual frequency comes from the fact that OSM/EPSS throttles the cluster
> > frequency based on a number of different factors (thermal, voltages
> > ...).
> > This is reported back to the kernel using the thermal pressure
> > interface. It would be quite interesting to see some investigation in
> > how efficient the kernel is at making use of this feedback.
> 
> -- 
> viresh