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

From: Ulf Hansson
Date: Fri Aug 03 2018 - 07:44:14 EST

On 19 July 2018 at 12:22, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>
>> Co-developed-by: Lina Iyer <lina.iyer@xxxxxxxxxx>
>> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
>> ---
>> 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