Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state" binding to OPP nodes

From	Viresh Kumar <viresh.kumar@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state" binding to OPP nodes
Date	2017-03-01 07:20 +0100
Message-ID	<tg5Md-7eV-1@gated-at.bofh.it> (permalink)
References	(2 earlier) <tfE9j-53z-5@gated-at.bofh.it> <tfL18-1He-7@gated-at.bofh.it> <tfQNc-5z5-5@gated-at.bofh.it> <tfRJf-6ds-1@gated-at.bofh.it> <tfSvD-6NI-1@gated-at.bofh.it>
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On 28-02-17, 09:52, Rob Herring wrote:
> On Tue, Feb 28, 2017 at 9:14 AM, Ulf Hansson <ulf.hansson@linaro.org> wrote:
> > This comes from the early design of the generic PM domain, thus I
> > assume we have some HW with such complex PM topology. However, I don't
> > know if it is actually being used.
> >
> > Moreover, the corresponding DT bindings for "power-domains" parents,
> > can easily be extended to cover more than one parent. See more in
> > Documentation/devicetree/bindings/power/power_domain.txt
> 
> I could easily see device having 2 power domains. For example a cpu
> may have separate domains for RAM/caches and logic.

An important thing here is that PM domain doesn't support such devices. i.e. a
device isn't allowed to have multiple PM domains today. So a way to support such
devices can be to create a virtual PM domain, that has two parents and device as
its child.

-- 
viresh

Thread

[PATCH V3 0/7] PM / Domains: Implement domain performance states Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-24 10:20 +0100
  [PATCH V3 5/7] PM / domain: Register for PM QOS performance notifier Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-24 10:20 +0100
  [PATCH V3 1/7] PM / Domains: Introduce "performance-states" binding Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-24 10:20 +0100
    Re: [PATCH V3 1/7] PM / Domains: Introduce "performance-states"  binding Rob Herring <robh@kernel.org> - 2017-02-28 02:10 +0100
      Re: [PATCH V3 1/7] PM / Domains: Introduce "performance-states"  binding Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-28 06:40 +0100
  [PATCH V3 7/7] PM / OPP: Add support to parse domain-performance-state Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-24 10:40 +0100
  [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state" binding to OPP nodes Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-24 11:20 +0100
    Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Rob Herring <robh@kernel.org> - 2017-02-28 01:50 +0100
      Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-28 09:10 +0100
        Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Rob Herring <robh@kernel.org> - 2017-02-28 15:20 +0100
          Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Ulf Hansson <ulf.hansson@linaro.org> - 2017-02-28 16:20 +0100
            Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Rob Herring <robh@kernel.org> - 2017-02-28 17:10 +0100
              Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Geert Uytterhoeven <geert@linux-m68k.org> - 2017-02-28 20:50 +0100
              Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Viresh Kumar <viresh.kumar@linaro.org> - 2017-03-01 07:20 +0100
                Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-01 09:50 +0100
                Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Viresh Kumar <viresh.kumar@linaro.org> - 2017-03-01 10:30 +0100
              Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Rajendra Nayak <rnayak@codeaurora.org> - 2017-03-01 09:00 +0100
                Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Rob Herring <robh@kernel.org> - 2017-03-02 00:20 +0100
                Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Rajendra Nayak <rnayak@codeaurora.org> - 2017-03-02 04:50 +0100
          Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state"  binding to OPP nodes Viresh Kumar <viresh.kumar@linaro.org> - 2017-03-01 08:20 +0100
  Re: [PATCH V3 0/7] PM / Domains: Implement domain performance states Kevin Hilman <khilman@baylibre.com> - 2017-03-10 21:40 +0100
    Re: [PATCH V3 0/7] PM / Domains: Implement domain performance states Viresh Kumar <viresh.kumar@linaro.org> - 2017-03-13 11:50 +0100

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