diff --git a/drivers/staging/greybus/greybus_protocols.h b/drivers/staging/greybus/greybus_protocols.h
index 0056c2a30f22..44957bd8955b 100644
--- a/drivers/staging/greybus/greybus_protocols.h
+++ b/drivers/staging/greybus/greybus_protocols.h
@@ -59,11 +59,19 @@
 #define GB_DEVICE_ID_AP				1
 #define GB_DEVICE_ID_MODULES_START		2
 
-/* Bundle-id and cport-id for control cport */
+/*
+ * Bundle/cport for control/svc cport: The same bundle/cport is shared by both
+ * CONTROL and SVC protocols for communication between AP and SVC.
+ */
+#define GB_SVC_BUNDLE_ID			0
+#define GB_SVC_CPORT_ID				2
 #define GB_CONTROL_BUNDLE_ID			0
 #define GB_CONTROL_CPORT_ID			2
 
 
+/* Control Protocol */
+
+
 /* version request has no payload */
 struct gb_protocol_version_response {
 	__u8	major;