From: Viresh Kumar <viresh.kumar@linaro.org>
To: Rob Herring <robh@kernel.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
Rafael Wysocki <rjw@rjwysocki.net>,
Kevin Hilman <khilman@linaro.org>,
Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
Stephen Boyd <sboyd@codeaurora.org>,
"linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Lina Iyer <lina.iyer@linaro.org>,
Rajendra Nayak <rnayak@codeaurora.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: Re: [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state" binding to OPP nodes
Date: Wed, 1 Mar 2017 11:44:02 +0530 [thread overview]
Message-ID: <20170301061402.GE24323@vireshk-i7> (raw)
In-Reply-To: <CAL_Jsq+7DGX_1U99cc3rhk8zzSj6iKe3kpijp7KTz90xXA_V9g@mail.gmail.com>
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
next prev parent reply other threads:[~2017-03-01 6:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1487926924.git.viresh.kumar@linaro.org>
[not found] ` <cover.1487926924.git.viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-02-24 9:06 ` [PATCH V3 1/7] PM / Domains: Introduce "performance-states" binding Viresh Kumar
[not found] ` <132e9200102bf2f1175567f0862596d098363d9e.1487926924.git.viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-02-28 0:31 ` Rob Herring
2017-02-28 5:36 ` Viresh Kumar
2017-02-24 9:06 ` [PATCH V3 2/7] PM / OPP: Introduce "domain-performance-state" binding to OPP nodes Viresh Kumar
[not found] ` <ceb1bf5f696138c30b30743c24b619336d438d7c.1487926924.git.viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-02-28 0:39 ` Rob Herring
2017-02-28 6:57 ` Viresh Kumar
2017-02-28 14:10 ` Rob Herring
[not found] ` <CAL_JsqLx6Y=JgaVtJPFwERQ_=5qwqp5EY1+B=cdfBJO55Vct4w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-02-28 15:14 ` Ulf Hansson
[not found] ` <CAPDyKFo5TjTa-hTzNp5KCpozU87L22piCXaSjWMTr4xVkgP+Pg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-02-28 15:52 ` Rob Herring
2017-02-28 19:13 ` Geert Uytterhoeven
2017-03-01 6:14 ` Viresh Kumar [this message]
2017-03-01 8:45 ` Geert Uytterhoeven
2017-03-01 8:54 ` Viresh Kumar
2017-03-01 6:27 ` Rajendra Nayak
2017-03-01 23:13 ` Rob Herring
2017-03-02 3:30 ` Rajendra Nayak
2017-03-01 6:12 ` Viresh Kumar
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