linux-kernel - Re: [RFC V7 2/2] OPP: Allow "opp-hz" and "opp-microvolt" to contain magic values

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Message-ID: <CAL_JsqK-qtAaM_Ou5NtxcWR3F_q=8rMPJUm-VqGtKhbtWe5SAQ@mail.gmail.com>
Date:   Wed, 1 Nov 2017 15:39:51 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Kevin Hilman <khilman@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Sudeep Holla <sudeep.holla@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC V7 2/2] OPP: Allow "opp-hz" and "opp-microvolt" to contain
 magic values

On Tue, Oct 31, 2017 at 9:17 PM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 31 October 2017 at 16:02, Rob Herring <robh+dt@...nel.org> wrote:
>> Why not a new property for magic values? opp-magic? Don't we want to
>> know when we have magic values?
>
> I have kept a separate property since beginning (domain-performance-state)
> and moved to using these magic values in the existing field because of the
> suggestion Kevin gave earlier.
>
> https://marc.info/?l=linux-kernel&m=149306082218001&w=2
>
> I am not sure what to do now :)

Okay, I guess reusing the properties is fine.

>> Wouldn't magic values in opp-hz get propagated to user space?
>
> The OPP core puts them in debugfs just to know how the OPPs are
> set. Otherwise, I am not sure that the power domain core/drivers would
> be exposing that to user space.

I was thinking thru the cpufreq interface, but I guess this is not for cpus.

Rob