On 24 November 2016 at 17:06, 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.

V3->V4:
- Separate out cpu-supply fix in the binding in a separate patch (Mark).
- Add more documentation to the binding to explain that the relation to
  the supplies and the order of programming them is left for the
  platform specific bindings and that every platform using multiple
  regulators for their devices needs to provide a separate binding
  document explaining their implementation (Mark).
- @Rob and Stephen: I have kept your Acks for the bindings as the
  bindings only got a bit reworded (improved) since the time you guys
  Acked them. Please let me know if you want more improvement in the
  bindings now.
- V4 for 10/10 was sent earlier, which added a missing
  rcu_read_unlock(). Nothing else changed in it.
- Added some missing Kernel documentation comments

Hi Rafael,

The first version of this series was sent on 4th of October and its been
~2 months now that this series is getting reviewed. All of the stuff has
already been seen by Stephen and others.

Mark had some particular concerns in V3, which I discussed with him
over IRC and resolved. The DT bindings are already Acked by Rob
and Stephen otherwise.

Will it be possible to get this merged for 4.10-rc1, as no one has raised
any objections so far? Looks like Stephen is a bit busy at the moment,
and is unable to review stuff for now.

I don't want to get this delayed by another merge cycle. If there are any
shortcomings reported later by others, I can always go fix them very
quickly.

Thanks.

--
viresh
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