diff --git a/drivers/staging/greybus/greybus_protocols.h b/drivers/staging/greybus/greybus_protocols.h
index d5a63d38a28a..9b21a35292d1 100644
--- a/drivers/staging/greybus/greybus_protocols.h
+++ b/drivers/staging/greybus/greybus_protocols.h
@@ -837,6 +837,7 @@ struct gb_spi_transfer_response {
 #define GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET	0x17
 #define GB_SVC_TYPE_TIMESYNC_WAKE_PINS_ACQUIRE	0x18
 #define GB_SVC_TYPE_TIMESYNC_WAKE_PINS_RELEASE	0x19
+#define GB_SVC_TYPE_TIMESYNC_PING		0x1a
 #define GB_SVC_TYPE_MODULE_INSERTED		0x1f
 #define GB_SVC_TYPE_MODULE_REMOVED		0x20
 #define GB_SVC_TYPE_INTF_ACTIVATE		0x27
@@ -975,6 +976,11 @@ struct gb_svc_timesync_wake_pins_acquire_request {
 /* timesync wake pins release request has no payload */
 /* timesync wake pins release response has no payload */
 
+/* timesync svc ping request has no payload */
+struct gb_svc_timesync_ping_response {
+	__le64	frame_time;
+} __packed;
+
 #define GB_SVC_UNIPRO_FAST_MODE			0x01
 #define GB_SVC_UNIPRO_SLOW_MODE			0x02
 #define GB_SVC_UNIPRO_FAST_AUTO_MODE		0x04