linux-kernel - Re: [PATCH V4 1/9] PM / OPP: Allow OPP table to be used for power-domains

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Message-ID: <20170419114740.GD5436@vireshk-i7>
Date:   Wed, 19 Apr 2017 17:17:40 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, ulf.hansson@...aro.org,
        Kevin Hilman <khilman@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        robh+dt@...nel.org, lina.iyer@...aro.org, rnayak@...eaurora.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH V4 1/9] PM / OPP: Allow OPP table to be used for
 power-domains

On 18-04-17, 17:01, Sudeep Holla wrote:
> Understood. I would incline towards reusing regulators we that's what is

It can be just a regulator, but it can be anything else as well. That
entity may have its own clock/volt/current tunables, etc.

> changed behind the scene. Calling this operating performance point
> is misleading and doesn't align well with existing specs/features.

Yeah, but there are no voltage levels available here and that doesn't
fit as a regulator then.

> Understood. We have exactly same thing with SCPI but it controls both
> frequency and voltage referred as operating points. In general, this OPP
> terminology is used in SCPI/ACPI/SCMI specifications as both frequency
> and voltage control. I am bit worried that this binding might introduce
> confusions on the definitions. But it can be reworded/renamed easily if
> required.

Yeah, so far we have been looking at OPPs as freq-voltage pairs ONLY
and that is changing. I am not sure if it going in the wrong
direction really. Without frequency also it is an operating point for
the domain. Isn't it?

-- 
viresh