-All phases use bus, type, or class callbacks (that is, methods defined in
-dev->bus->pm, dev->type->pm, or dev->class->pm). These callbacks are mutually
-exclusive, so if the device type provides a struct dev_pm_ops object pointed to
-by its pm field (i.e. both dev->type and dev->type->pm are defined), the
-callbacks included in that object (i.e. dev->type->pm) will be used. Otherwise,
-if the class provides a struct dev_pm_ops object pointed to by its pm field
-(i.e. both dev->class and dev->class->pm are defined), the PM core will use the
-callbacks from that object (i.e. dev->class->pm). Finally, if the pm fields of
-both the device type and class objects are NULL (or those objects do not exist),
-the callbacks provided by the bus (that is, the callbacks from dev->bus->pm)
-will be used (this allows device types to override callbacks provided by bus
-types or classes if necessary).
+All phases use PM domain, bus, type, or class callbacks (that is, methods
+defined in dev->pm_domain->ops, dev->bus->pm, dev->type->pm, or dev->class->pm).
+These callbacks are regarded by the PM core as mutually exclusive. Moreover,
+PM domain callbacks always take precedence over bus, type and class callbacks,
+while type callbacks take precedence over bus and class callbacks, and class
+callbacks take precedence over bus callbacks. To be precise, the following
+rules are used to determine which callback to execute in the given phase:
+
+ 1. If dev->pm_domain is present, the PM core will attempt to execute the
+ callback included in dev->pm_domain->ops. If that callback is not
+ present, no action will be carried out for the given device.
+
+ 2. Otherwise, if both dev->type and dev->type->pm are present, the callback
+ included in dev->type->pm will be executed.
+
+ 3. Otherwise, if both dev->class and dev->class->pm are present, the
+ callback included in dev->class->pm will be executed.
+
+ 4. Otherwise, if both dev->bus and dev->bus->pm are present, the callback
+ included in dev->bus->pm will be executed.
+
+This allows PM domains and device types to override callbacks provided by bus
+types or device classes if necessary.