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docs: pm: Add device runtime definition

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Add a brief definition about device runtime.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
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Flavio Ceolin 2021-05-10 12:20:04 -07:00 • committed by Anas Nashif
commit 1d364c1701
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7
doc/reference/power_management/index.rst
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@ -28,6 +28,13 @@ Terminology
the SOC level. Power states are represented by :c:enum:`pm_state` and each
one has a different meaning.
:dfn:`Device Runtime Power Management`
Device Runtime Power Management (PM) refers the capability of
devices be able of saving energy independently of the the
system. Devices will keep reference of their usage and will
automatically be suspended or resumed. This feature is enabled via
the ::option:`CONFIG_PM_DEVICE_RUNTIME` Kconfig option.
Overview
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