linux-kernel - Re: [PATCH v7 0/4] qcom-cpufreq-hw: Add CPU clock provider support

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Message-ID: <20221117115807.GF93179@thinkpad>
Date:   Thu, 17 Nov 2022 17:28:07 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     andersson@...nel.org, viresh.kumar@...aro.org,
        krzysztof.kozlowski+dt@...aro.org, rafael@...nel.org,
        robh+dt@...nel.org, johan@...nel.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v7 0/4] qcom-cpufreq-hw: Add CPU clock provider support

On Thu, Nov 17, 2022 at 11:52:03AM +0000, Sudeep Holla wrote:
> On Thu, Nov 17, 2022 at 04:42:07PM +0530, Manivannan Sadhasivam wrote:
> > On Thu, Nov 17, 2022 at 10:19:03AM +0000, Sudeep Holla wrote:
> > > 
> > > Why do you need the above 3 changes if the below(4/4) will ensure
> > > cpufreq_get(cpu) returns the clock frequency. I was expecting to drop the
> > > whole "confusing" clock bindings and the unnecessary clock provider.
> > > 
> > > Can't we just use cpufreq_get(cpu) ?
> > > 
> > 
> > This can be possible for OPP implementations for the CPUs but not for other
> > peripherals making use of OPP framework like GPU etc... Moreover this may end
> > up with different code path for CPUs and other peripherals inside OPP framework.
> > 
> 
> Fair enough, you can use this for non-CPU devices. But you are adding this for
> CPUs here. Is the consumer unaware that this is a CPU or non-CPU device ?
> If so, make sense. Otherwise, it is unnecessary to go through the clk
> framework to get CPU frequency.
> 

The consumer here is the OPP framework and yes it doesn't have the knowledge of
the device it is dealing with (for this context).

Thanks,
Mani

> -- 
> Regards,
> Sudeep

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