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docs: pm: Improve residency policy documentation

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Add information about exit latency time.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2021-05-11 09:52:57 -07:00 • committed by Anas Nashif
commit 7c5ce5ba51
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10
doc/reference/power_management/index.rst
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@ -135,6 +135,16 @@ power savings, and with a minimum residency value (in device tree, see
:zephyr_file:`dts/bindings/power/state.yaml`) less than or equal to :zephyr_file:`dts/bindings/power/state.yaml`) less than or equal to
the scheduled system idle time duration. the scheduled system idle time duration.
This policy also accounts for the time necessary to become active
again. The core logic used by this policy to select the best power
state is:
.. code-block:: c
if (time_to_next_scheduled_event >= (state.min_residency_us + state.exit_latency))) {
return state
}
Application Application
----------- -----------