linux-kernel - Re: [PATCH v8 05/26] PM / Domains: Add helper functions to attach/detach CPUs to/from genpd

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Message-ID: <CAPDyKFrteziAy==C+-mEiV-404--qwBu8JLoSAHYJjb8p1a+Ag@mail.gmail.com>
Date:   Fri, 3 Aug 2018 13:44:08 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Lina Iyer <lina.iyer@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Juri Lelli <juri.lelli@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 05/26] PM / Domains: Add helper functions to
 attach/detach CPUs to/from genpd

On 19 July 2018 at 12:22, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Wednesday, June 20, 2018 7:22:05 PM CEST Ulf Hansson wrote:
>> Introduce two new genpd helper functions, of_genpd_attach|detach_cpu(),
>> which takes the CPU-number as an in-parameter.
>>
>> To attach a CPU to a genpd, of_genpd_attach_cpu() starts by fetching the
>> struct device belonging to the CPU. Then it calls genpd_dev_pm_attach(),
>> which via DT tries to hook up the CPU device to its corresponding PM
>> domain. If it succeeds, of_genpd_attach_cpu() continues to prepare/enable
>> runtime PM of the device.
>>
>> To detach a CPU from its PM domain, of_genpd_attach_cpu() reverse the
>> operations made from of_genpd_attach_cpu(). However, first it checks that
>> the CPU device has a valid PM domain pointer assigned, as to make sure it
>> belongs to genpd.
>>
>> Cc: Lina Iyer <ilina@...eaurora.org>
>> Co-developed-by: Lina Iyer <lina.iyer@...aro.org>
>> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
>> ---
>>  drivers/base/power/domain.c | 69 +++++++++++++++++++++++++++++++++++++
>>  include/linux/pm_domain.h   |  9 +++++
>>  2 files changed, 78 insertions(+)

[...]

> I'd combine this with patch [04/26].  The split here is somewhat artificial IMO.

I wanted to keep one change per patch, hence the split.

$subject patch introduces helpers to add CPU devices to genpd and
isn't really part of making genpd to cope with CPU devices. So
$subject patch is about avoiding open coding.

Are you still sure you want me to squash the changes?

Kind regards
Uffe