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Documentation: EM: Describe new registration method using DT

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The new registration method allows to get power values from the DT OPP
definition. The new OPP entry property "opp-microwatt" contains total
power expressed in micro-Watts. Align the EM documentation with this
new possible registration method of EM.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Lukasz Luba 2022-03-02 11:29:17 +00:00 committed by Viresh Kumar
parent 32bf8bc9a0
commit f48a0c475c
1 changed files with 10 additions and 0 deletions
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Documentation/power/energy-model.rst
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@ -113,6 +113,16 @@ to: return warning/error, stop working or panic.
See Section 3. for an example of driver implementing this See Section 3. for an example of driver implementing this
callback, or Section 2.4 for further documentation on this API callback, or Section 2.4 for further documentation on this API
Registration of EM using DT
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The EM can also be registered using OPP framework and information in DT
"operating-points-v2". Each OPP entry in DT can be extended with a property
"opp-microwatt" containing micro-Watts power value. This OPP DT property
allows a platform to register EM power values which are reflecting total power
(static + dynamic). These power values might be coming directly from
experiments and measurements.
Registration of 'simple' EM Registration of 'simple' EM
~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~