linux-kernel - Re: [PATCH v5 09/12] dt-bindings: misc: add bindings for throttler

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Message-ID: <20180801173946.GL68975@google.com>
Date:   Wed, 1 Aug 2018 10:39:46 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Benson Leung <bleung@...omium.org>,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v5 09/12] dt-bindings: misc: add bindings for throttler

Hi Chanwoo,

On Wed, Aug 01, 2018 at 05:27:57PM +0900, Chanwoo Choi wrote:
> Hi Matthias,
> 
> On 2018년 07월 04일 08:47, Matthias Kaehlcke wrote:
> > The Throttler is used for non-thermal throttling of system components
> > like CPUs or devfreq devices.
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> 
> If possible, I hope the more detailed example for "cpu0_opp03, &cpu1_opp02, &gpu_opp03"
> because I'm confusing the meaning of 'cpu0_opp03' phandle.

I omitted the OPP definitions to avoid cluttering the example. I'm
happy to add them if DT folks also think it would add value.

> cpu0_opp03 indicates the only one specific OPP entry among set of
> OPP entries of CPU0 cpufreq? or cpu0_opp03 indicates the set of OPP
> entries for CPU0 cpufreq ?

cpu0_opp03 and the other phandles are specific OPP entries, that
indicate the throttler which frequencies/OPPs should be used for
throttling. For devices/CPUs with multiple levels of throttling
multiple entries from its OPP set are listed. In the example a single
level of throttling is used for all devices/CPUs.