pm: device: add missing return code to pm_device_state_get
-ENOSYS can be returned if the device does not support PM.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/include/pm/device.h b/include/pm/device.h
index fef1968..3b12a1c 100644
--- a/include/pm/device.h
+++ b/include/pm/device.h
@@ -168,7 +168,7 @@
* @retval -ENOTSUP If requested state is not supported.
* @retval -EALREADY If device is already at the requested state.
* @retval -EBUSY If device is changing its state.
-
+ * @retval -ENOSYS If device does not support PM.
* @retval Errno Other negative errno on failure.
*/
int pm_device_state_set(const struct device *dev,
