linux-kernel - Re: [PATCH 1/2] PM / Domains: Introduce domain-performance-state binding

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Message-ID: <4f815e31-22d0-fef7-953c-257fa2bbcb9d@codeaurora.org>
Date:   Mon, 28 Nov 2016 10:27:57 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Kevin Hilman <khilman@...libre.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        "linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Lina Iyer <lina.iyer@...aro.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Nayak Rajendra <rnayak@...eaurora.org>
Subject: Re: [PATCH 1/2] PM / Domains: Introduce domain-performance-state
 binding

On 11/23/2016 08:40 PM, Viresh Kumar wrote:
> On 23-11-16, 18:03, Stephen Boyd wrote:
>> On 11/23, Kevin Hilman wrote:
>>> Vincent Guittot <vincent.guittot@...aro.org> writes:
>>>> On 23 November 2016 at 16:51, Kevin Hilman <khilman@...libre.com> wrote:
>>>>> Then, at least for this use case, we're talking about voltage, not some
>>>>> unspecified units.
>> In some cases we actually know the voltage of the domain and
>> would want to put some voltage mapping in DT. For example, level
>> 1 is voltage 2V and level 2 is voltage 2.5V.
> But even in these cases we wouldn't be using the voltage values within the
> kernel as we will be giving only a performance state to the M3 core, right?

Nope. In these cases we need to set a certain voltage and we do that by
requesting it via the M3 core.

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