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doc: release notes: add details on device PM changes

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Add some details on the changes made in the device power management area
(callback simplification).

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
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Gerard Marull-Paretas 2021-09-23 15:40:33 +02:00 • committed by Anas Nashif
commit b4b1212c21
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doc/releases/release-notes-2.7.rst
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@ -463,6 +463,17 @@ Libraries / Subsystems
* ``device_busy_check`` -> ``pm_device_is_busy`` * ``device_busy_check`` -> ``pm_device_is_busy``
* ``device_any_busy_check`` -> ``pm_device_is_any_busy`` * ``device_any_busy_check`` -> ``pm_device_is_any_busy``
* The device power management callback (``pm_device_control_callback_t``) has
been largely simplified to work based on *actions*, resulting in simpler and
more natural implementations. This principle is also used by other OSes like
the Linux Kernel. As a result, the callback argument list has been reduced
to the device instance and an action (e.g. ``PM_DEVICE_ACTION_RESUME``).
Other improvements include specification of error codes, removal of some
unused/unclear states, or guarantees such as avoid calling a device for
suspend/resume if it is already at the right state. All these changes
together have allowed simplifying multiple device power management callback
implementations.
* Logging * Logging