On 1 December 2016 at 16:28, Viresh Kumar [off-list ref] wrote:

Hi,

Some platforms (like TI) have complex DVFS configuration for CPU
devices, where multiple regulators are required to be configured to
change DVFS state of the device. This was explained well by Nishanth
earlier [1].

One of the major complaints around multiple regulators case was that the
DT isn't responsible in any way to represent the order in which multiple
supplies need to be programmed, before or after a frequency change. It
was considered in this patch and such information is left for the
platform specific OPP driver now, which can register its own
opp_set_rate() callback with the OPP core and the OPP core will then
call it during DVFS.

The patches are tested on Exynos5250 (Dual A15). I have hacked around DT
and code to pass values for multiple regulators and verified that they
are all properly read by the kernel (using debugfs interface).

Dave Gerlach has already tested [2] it on the real TI platforms and it
works well for him.

This is rebased over: linux-next branch in the PM tree.

V6->V7:
- Added RBY from Stephen for the 8th patch as well.
- Rebased over pm/bleeding-edge as the dependency patch is already
  applied there.
- s/dev_pm_opp_set_regulator()/dev_pm_opp_set_regulators() in a comment.
- Removed the local 'names' array in cpufreq-dt and used "&name"
  instead.
- Only the 6th patch doesn't have a Reviewed-by Tag now..

Hi Rafael,

V6 of this series received some minor comments [1] and I have
resolved them all here. Now that the merge window is so close,
I think we should be merge it now so that it gets a chance to live
in linux-next for few days.

--
viresh

[1] https://marc.info/?l=linux-pm&m=148054543630253&w=2