linux-kernel - Re: [PATCH V2 0/8] PM / OPP: Multiple regulator support

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Date:   Fri, 21 Oct 2016 21:10:45 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rob Herring <robh@...nel.org>, Dave Gerlach <d-gerlach@...com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH V2 0/8] PM / OPP: Multiple regulator support

On 21 October 2016 at 19:09, Rafael J. Wysocki <rafael@...nel.org> wrote:
> On Thu, Oct 20, 2016 at 10:44 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>> Hi,
>>
>> Some platforms (like TI) have complex DVFS configuration for CPU
>> devices, where multiple regulators are required to be configured to
>> change DVFS state of the device. This was explained well by Nishanth
>> earlier [1].
>>
>> Some thoughts went into it few months back but then it all got lost. I
>> am trying to get that back on track with this thread.
>>
>> One of the major complaints around multiple regulators case was that the
>> DT isn't responsible in any way to represent the ordering in which
>> multiple supplies need to be programmed, before or after frequency
>> change. It was considered in this patch and such information is left to
>> the platform specific OPP driver now, which can register its own
>> opp_set_rate() callback with the OPP core and the OPP core will then
>> call it during DVFS.
>>
>> The patches are tested on Exynos5250 (Dual A15). I have hacked around DT
>> and code to pass values for multiple regulators and verified that they
>> are all properly read by the kernel (using debugfs interface).
>>
>> Though more testing on real (TI) platforms would be useful.
>>
>> This is rebased over: linux-next branch in the PM tree.
>>
>> V1->V2:
>> - Ack from Rob for 1st patch
>> - Moved the supplies structure to pm_opp.h (Dave)
>> - Fixed an compilation warning.
>
> I need somebody from the OPP camp to review patches [2-8/8] for me.

Sure, I have already asked Stephen yesterday to do that.

--
viresh