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Subject[PATCH V2 0/9] OPP: Support multiple power-domains per device

We are already at 4.19-rc7 and there may not enough time to get this
reviewed/tested/ready for the upcoming merge window and so there is no
hurry in getting this merged. The purpose to send now is to get this
reviewed/tested, which would allow more more development to happen on
top of this.

This series improves the OPP core (and a bit of genpd core as well) to
support multiple phandles in the "required-opps" property, which are
only used for multiple power-domains per device for now.

We still don't propagate the changes to master domains for the
sub-domains, but this patchset is an important stepping stone for that
to happen.

Tested on Hikey960 after faking some power domains for CPUs.

- Had a discussion at Linaro connect with Ulf regarding the changes V1
did in the genpd core and what his objections are to them. Based on
his suggestions many changes are made.
- The OPP core still needs the virtual device pointers to set the
performance state for multiple domains, but the genpd core doesn't
provide them automatically to the OPP core. One of the reasons behind
this is to give more power to the consumer drivers which may not want
to enable all the genpds at once.
- The consumer drivers would now need to call the APIs
dev_pm_opp_{set|put}_genpd_device() in order to set/reset these
virtual device pointers.
- More locking is put in place to protect the genpd device pointers in
OPP core.
- Reorg of the code at many places to make code less redundant.


Viresh Kumar (9):
OPP: Identify and mark genpd OPP tables
OPP: Separate out custom OPP handler specific code
OPP: Populate required opp tables from "required-opps" property
OPP: Populate OPPs from "required-opps" property
PM / Domains: Add genpd_opp_to_performance_state()
OPP: Add dev_pm_opp_{set|put}_genpd_device() helper
OPP: Configure all required OPPs
OPP: Rename and relocate of_genpd_opp_to_performance_state()
OPP: Remove of_dev_pm_opp_find_required_opp()

drivers/base/power/domain.c | 51 +++---
drivers/opp/core.c | 261 ++++++++++++++++++++++--------
drivers/opp/of.c | 313 +++++++++++++++++++++++++++++++-----
drivers/opp/opp.h | 20 +++
include/linux/pm_domain.h | 7 +-
include/linux/pm_opp.h | 16 +-
6 files changed, 519 insertions(+), 149 deletions(-)


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