pm: device: Use pm flags to mark a power domain

Add a new flag that is used to tell whether or not a device is a power
domain. In order to a device be identified as a power domain the node
has to be compatible with "power-domain".

Signed-off-by: Flavio Ceolin <[email protected]>

Author: Flavio Ceolin

include/zephyr/pm/device.h

@@ -41,6 +41,8 @@ enum pm_device_flag {
 	PM_DEVICE_FLAG_RUNTIME_ENABLED,
 	/** Indicates if the device pm is locked.  */
 	PM_DEVICE_FLAG_STATE_LOCKED,
+	/** Indicateds if the device is used as a power domain */
+	PM_DEVICE_FLAG_PD,
 };
 
 /** @endcond */
@@ -176,8 +178,10 @@ struct pm_device {
 		.state = PM_DEVICE_STATE_ACTIVE,			\
 		.flags = ATOMIC_INIT(COND_CODE_1(			\
 				DT_NODE_EXISTS(node_id),		\
-				(DT_PROP_OR(node_id, wakeup_source, 0)),\
-				(0)) << PM_DEVICE_FLAG_WS_CAPABLE),	\
+				((DT_PROP_OR(node_id, wakeup_source, 0) \
+				  << PM_DEVICE_FLAG_WS_CAPABLE) |	\
+				 (DT_NODE_HAS_COMPAT(node_id, power_domain) << \
+				  PM_DEVICE_FLAG_PD)), (0))),		\
 		Z_PM_DEVICE_POWER_DOMAIN_INIT(node_id)			\
 	}