linux-kernel - Re: [PATCH v4] dt-bindings: dvfs: Add support for generic performance domains

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Date:   Tue, 19 Oct 2021 12:54:25 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Sudeep Holla <sudeep.holla@....com>, Rob Herring <robh@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Hector Yuan <hector.yuan@...iatek.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v4] dt-bindings: dvfs: Add support for generic
 performance domains

On 15-10-21, 11:17, Ulf Hansson wrote:
> As far as I understand, the "performance domains" DT bindings that
> $subject patch introduces, allows us to group devices into domains, to
> let them be "performance controlled" together. Right?

This and it also provides a reg space where we can get/set the
performance state.

> Unless I am missing something, it looks like power domains DT bindings
> already offer this for us. Yes, certainly, the DT doc [1] needs an
> updated description to better explain this, but other than that we
> should be fine, don't you think?

I think yes we can make it work through that as well, but I am not
sure if we will be able to use required-opp n stuff here as the DT
doesn't have the OPP table for the CPUs.

The CPU's freq table is generated at runtime, see
drivers/cpufreq/mediatek-cpufreq-hw.c for example.

-- 
viresh