dts: pm: Add wakeup-signal property

This is a new property to specify the wakeup signal number.
There are some SoC's where the wakeup signal can be a different
signal and not necessarily the interrupt number.
This property goes together with wakeup-source.

Signed-off-by: Mahesh Mahadevan <[email protected]>

Author: mmahadevan108

doc/releases/release-notes-4.3.rst

@@ -220,6 +220,7 @@ New APIs and options
    * The :kconfig:option:`PM_S2RAM_CUSTOM_MARKING` has been renamed to
      :kconfig:option:`HAS_PM_S2RAM_CUSTOM_MARKING` and refactored to be promptless. This option
      is now selected by SoCs if they need it for their "suspend-to-ram" implementations.
+   * Added devicetree property ``wakeup-signal``
 
 * Settings
 

dts/bindings/base/pm.yaml

@@ -16,6 +16,16 @@ properties:
       Wake up capable devices are disabled (interruptions will not wake up
       the system) by default but they can be enabled at runtime if necessary.
 
+  wakeup-signal:
+    type: int
+    description: |
+      Property to specify the wakeup signal number.
+
+      There are some SoC's where the wakeup signal can be a different signal
+      and not necessarily the interrupt number.
+
+      This property goes together with "wakeup-source" property.
+
   zephyr,pm-device-runtime-auto:
     type: boolean
     description: |