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Subject[PATCH v3 0/4] Clarify abstract scale usage for power values in Energy Model, EAS and IPA
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Hi all,

The Energy Model supports power values expressed in an abstract scale.
This has an impact on Intelligent Power Allocation (IPA) and should be
documented properly. Kernel sub-systems like EAS, IPA and DTPM
(new comming PowerCap framework) would use the new flag to capture
potential miss-configuration where the devices have registered different
power scales, thus cannot operate together.

There was a discussion below v2 of this patch series, which might help
you to get context of these changes [2].

The agreed approach is to have the DT as a source of power values expressed
always in milli-Watts and the only way to submit with abstract scale values
is via the em_dev_register_perf_domain() API.

Changes:
v3:
- added boolean flag to struct em_perf_domain and registration function
indicating if EM holds real power values in milli-Watts (suggested by
Daniel and aggreed with Quentin)
- updated documentation regarding this new flag
- dropped DT binding change for 'sustainable-power'
- added more maintainers on CC (due to patch 1/4 touching different things)
v2 [2]:
- updated sustainable power section in IPA documentation
- updated DT binding for the 'sustainable-power'
v1 [1]:
- simple documenation update with new 'abstract scale' in EAS, EM, IPA

Regards,
Lukasz Luba

[1] https://lore.kernel.org/linux-doc/20200929121610.16060-1-lukasz.luba@arm.com/
[2] https://lore.kernel.org/lkml/20201002114426.31277-1-lukasz.luba@arm.com/

Lukasz Luba (4):
PM / EM: Add a flag indicating units of power values in Energy Model
docs: Clarify abstract scale usage for power values in Energy Model
PM / EM: update the comments related to power scale
docs: power: Update Energy Model with new flag indicating power scale

.../driver-api/thermal/power_allocator.rst | 13 +++++++-
Documentation/power/energy-model.rst | 30 +++++++++++++++----
Documentation/scheduler/sched-energy.rst | 5 ++++
drivers/cpufreq/scmi-cpufreq.c | 3 +-
drivers/opp/of.c | 2 +-
include/linux/energy_model.h | 20 ++++++++-----
kernel/power/energy_model.c | 26 ++++++++++++++--
7 files changed, 81 insertions(+), 18 deletions(-)

--
2.17.1

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