Index: uspace/lib/c/include/ipc/devman.h
===================================================================
--- uspace/lib/c/include/ipc/devman.h	(revision 64d2b101abaf56a6f7c27f0d6b099785aa173f36)
+++ uspace/lib/c/include/ipc/devman.h	(revision ebebd3871c1d3a37638c25a5da4b48d2b3cb3ee0)
@@ -42,4 +42,13 @@
 
 typedef sysarg_t devman_handle_t;
+
+typedef enum {
+	/** Invalid value for debugging purposes */
+	fun_invalid = 0,
+	/** Function to which child devices attach */
+	fun_inner,
+	/** Fuction exported to external clients (leaf function) */
+	fun_exposed
+} fun_type_t;
 
 /** Ids of device models used for device-to-driver matching.
@@ -127,5 +136,5 @@
 typedef enum {
 	DEVMAN_DRIVER_REGISTER = IPC_FIRST_USER_METHOD,
-	DEVMAN_ADD_CHILD_DEVICE,
+	DEVMAN_ADD_FUNCTION,
 	DEVMAN_ADD_MATCH_ID,
 	DEVMAN_ADD_DEVICE_TO_CLASS