Many cpufreq drivers register with the energy model for each policy and
do exactly the same thing. Follow the footsteps of thermal-cooling, to
get it done from the cpufreq core itself.

Provide a new callback, which will be called, if present, by the cpufreq
core at the right moment (more on that in the code's comment). Also
provide a generic implementation that uses dev_pm_opp_of_register_em().

This also allows us to register with the EM at a later point of time,
compared to ->init(), from where the EM core can access cpufreq policy
directly using cpufreq_cpu_get() type of helpers and perform other work,
like marking few frequencies inefficient, this will be done separately.

This is build/boot tested by the bot for a couple of boards.

https://gitlab.com/vireshk/pmko/-/pipelines/351525873

Note that I haven't picked any of the Reviewed-by tags from the first version
since the idea is very much changed here.

V1->V2:
- Add a callback instead of flag.
- Register before governor is initialized.
- Update scmi driver as well.
- Don't unregister from the EM core.

--
Viresh

Viresh Kumar (9):
  cpufreq: Auto-register with energy model if asked
  cpufreq: dt: Use auto-registration for energy model
  cpufreq: imx6q: Use auto-registration for energy model
  cpufreq: mediatek: Use auto-registration for energy model
  cpufreq: omap: Use auto-registration for energy model
  cpufreq: qcom-cpufreq-hw: Use auto-registration for energy model
  cpufreq: scpi: Use auto-registration for energy model
  cpufreq: vexpress: Use auto-registration for energy model
  cpufreq: scmi: Use .register_em() callback

 drivers/cpufreq/cpufreq-dt.c           |  3 +-
 drivers/cpufreq/cpufreq.c              | 12 ++++++
 drivers/cpufreq/imx6q-cpufreq.c        |  2 +-
 drivers/cpufreq/mediatek-cpufreq.c     |  3 +-
 drivers/cpufreq/omap-cpufreq.c         |  2 +-
 drivers/cpufreq/qcom-cpufreq-hw.c      |  3 +-
 drivers/cpufreq/scmi-cpufreq.c         | 55 +++++++++++++++-----------
 drivers/cpufreq/scpi-cpufreq.c         |  3 +-
 drivers/cpufreq/vexpress-spc-cpufreq.c |  3 +-
 include/linux/cpufreq.h                | 14 +++++++
 10 files changed, 65 insertions(+), 35 deletions(-)

-- 
2.31.1.272.g89b43f80a514


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