linux-kernel - Re: [PATCH V2 0/2] PM / Domains / OPP: Introduce domain-performance-state binding

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Message-ID: <20170103110754.GA14137@vireshk-i7>
Date:   Tue, 3 Jan 2017 16:37:54 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, linaro-kernel@...ts.linaro.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephen Boyd <sboyd@...eaurora.org>,
        Nishanth Menon <nm@...com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...libre.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Lina Iyer <lina.iyer@...aro.org>, devicetree@...r.kernel.org,
        Nayak Rajendra <rnayak@...eaurora.org>
Subject: Re: [PATCH V2 0/2] PM / Domains / OPP: Introduce
 domain-performance-state binding

On 22-12-16, 12:14, Rob Herring wrote:
> On Mon, Dec 12, 2016 at 04:26:17PM +0530, Viresh Kumar wrote:
> > Hello,
> > 
> > Some platforms have the capability to configure the performance state of
> > their Power Domains. The performance levels are represented by positive
> > integer values, a lower value represents lower performance state.
> > 
> > We had some discussions about it in the past on the PM list [1], which is
> > followed by discussions during the LPC. The outcome of all that was that we
> > should extend Power Domain framework to support active state power management
> > as well.
> > 
> > The power-domains until now were only concentrating on the idle state
> > management of the device and this needs to change in order to reuse the
> > infrastructure of power domains for active state management.
> 
> >From a h/w perspective, are idle states really different from 
> performance states? 
> 
> > 
> > To get a complete picture of the proposed plan, following is what we
> > need to do:
> > - Create DT bindings to get domain performance state information for the
> >   platforms.
> 
> I would do this last so you can evolve things if you're not certain 
> about what the bindings should look like. You can always start with 
> things in the kernel and add to DT later.

Okay, I have just posted some code for this:

lkml.kernel.org/r/cover.1483439894.git.viresh.kumar@...aro.org

Thanks for your inputs.

-- 
viresh