linux-kernel - [PATCH 0/2] PM / Domains: Allow drivers to attach PM domain callbacks to devices at any time

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Date:	Tue, 3 Jul 2012 12:27:45 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linux PM list <linux-pm@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 0/2] PM / Domains: Allow drivers to attach PM domain callbacks to devices at any time

Hi,

This is a follow-up of the discussion I had with Arnd and Magnus during
the LCJ last month.

Namely, one of the limitations of the current generic PM domains code is that
pm_genpd_add_callbacks() has to be executed after the device in question has
been added to a PM domain.  This means that, if a driver wants to run this
routine from its .probe() callback, it cannot be registered before adding
the device to the PM domain, which potentially may be a problem when device
trees get involved into the system initialization.

For this reason, it is desirable to allow pm_genpd_add_callbacks() to be called
for devices that haven't been added to any generic PM domains yet and the
following patches attempt to make that happen.

[1/2] Add reference counter for objects used to store PM domains data related
      to devices.
[2/2] Make it possible to call pm_genpd_add_callbacks() before the device is
      added to a PM domain.

Thanks,
Rafael

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