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doc: pm: Add wakeup information

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Add documentation for wakeup sources.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2021-07-27 22:17:06 -07:00 • committed by Christopher Friedt
commit 1c6507afa8
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doc/reference/power_management/index.rst
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@ -395,6 +395,44 @@ Check Busy Status of All Devices API
Checks if any device is busy. The API returns 0 if no device in the system is busy. Checks if any device is busy. The API returns 0 if no device in the system is busy.
Wakeup capability
-----------------
Some devices are capable of waking the system up from a sleep state.
When a device has such capability, applications can enable or disable
this feature on a device dynamically using
:c:func:`pm_device_wakeup_enable`.
This property can be set on device declaring the property ``wakeup-source`` in
the device node in devicetree. For example, this devicetree fragment sets the
``gpio0`` device as a "wakeup" source:
.. code-block:: devicetree
gpio0: gpio@40022000 {
compatible = "ti,cc13xx-cc26xx-gpio";
reg = <0x40022000 0x400>;
interrupts = <0 0>;
status = "disabled";
label = "GPIO_0";
gpio-controller;
wakeup-source;
#gpio-cells = <2>;
};
By default, "wakeup" capable devices do not have this functionality enabled
during the device initialization. Applications can enable this functionality
later calling :c:func:`pm_device_wakeup_enable`.
.. note::
This property is **only** used by the system power management to identify
devices that should not be suspended.
It is responsability of driver or the application to do any additional
configuration required by the device to support it.
Device Runtime Power Management Device Runtime Power Management
******************************* *******************************