devfreq: Add support for devices which can idle

This patchset updates devfreq core to add support for devices
which can idle. When device idleness is detected perhaps
through runtime-pm, need some mechanism to suspend devfreq
load monitoring and resume when device is back online.

patch 1 introduce core design changes - per device work, decouple
delayed work from core and event based interaction.
patch 2 add devfreq suspend and resume apis.
patch 3 add new sysfs attribute for governor predicted next target
frequency and callback for current device frequency.

The existing devfreq apis are kept intact. Two new apis
devfreq_suspend_device() and devfreq_resume_device() are
added to support suspend/resume of device devfreq.

Changes since v1:
- revised locking mechanism
- added kerneldoc comments for load monitoring helper functions
- Fixed minor review comments

Changes since v2:
- added new helper function for polling interval update
- Handled work suspend/resume contention between devfreq driver
and sysfs

--
Rajagopal Venkat (3):
  devfreq: Core updates to support devices which can idle
  devfreq: Add suspend and resume apis
  devfreq: Add current freq callback in device profile

 Documentation/ABI/testing/sysfs-class-devfreq |  15 +-
 drivers/devfreq/devfreq.c                     | 469 ++++++++++++--------------
 drivers/devfreq/governor.h                    |  13 +
 drivers/devfreq/governor_performance.c        |  16 +-
 drivers/devfreq/governor_powersave.c          |  16 +-
 drivers/devfreq/governor_simpleondemand.c     |  33 ++
 drivers/devfreq/governor_userspace.c          |  23 +-
 include/linux/devfreq.h                       |  49 +--
 8 files changed, 341 insertions(+), 293 deletions(-)

-- 
1.7.11.3

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