[GIT PULL] devfreq fixes for v5.5-rc2

[Chanwoo Choi <cw00.choi@samsung.com>]

Dear Rafael,

This is devfreq-fixes pull request for v5.5-rc2. I add detailed description of
this pull request on the following tag. Please pull devfreq with following updates.
- tag name : devfreq-fixes-for-5.5-rc2

Regards,
Chanwoo Choi

The following changes since commit e42617b825f8073569da76dc4510bfa019b1c35a:

  Linux 5.5-rc1 (2019-12-08 14:57:55 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git tags/devfreq-fixes-for-5.5-rc2

for you to fetch changes up to 27dbc542f651ed09de910f274b32634904103774:

  PM / devfreq: Use PM QoS for sysfs min/max_freq (2019-12-09 12:19:16 +0900)

----------------------------------------------------------------

Update devfreq for 5.5-rc2

Detailed description for this pull request:
1. Update devfreq core
- Add PM QoS support for devfreq device with following QoS type. External user
of devfreq device can request the minimum and maximum frequency according to
their multiple requirements.
: DEV_PM_QOS_MIN_FREQUENCY is used for requesting the minimum device frequency.
: DEV_PM_QOS_MAX_FREQUENCY is used for requesting the maximum device frequency.

- Use PM QoS interface when entering the min/max_freq via sysfs interface.

- Add get_freq_range() helper function in order to get the final min/max
frequency among the multiple requirements of min/max frequency.

- Fix the issue such as fixing the return value and modify code
for more correct exception handling if error happen.

----------------------------------------------------------------

Leonard Crestez (6):
      PM / devfreq: Fix devfreq_notifier_call returning errno
      PM / devfreq: Set scaling_max_freq to max on OPP notifier error
      PM / devfreq: Introduce get_freq_range helper
      PM / devfreq: Don't fail devfreq_dev_release if not in list
      PM / devfreq: Add PM QoS support
      PM / devfreq: Use PM QoS for sysfs min/max_freq

 drivers/devfreq/devfreq.c | 273 ++++++++++++++++++++++++++++++++++------------
 include/linux/devfreq.h   |  14 ++-
 2 files changed, 212 insertions(+), 75 deletions(-)