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Documentation: EM: Describe new registration method using DT 

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>
This commit is contained in:
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
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~