diff --git a/include/drivers/emmc.h b/include/drivers/emmc.h
index 921f4cf..286c014 100644
--- a/include/drivers/emmc.h
+++ b/include/drivers/emmc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -25,6 +25,7 @@
 #define EMMC_CMD13			13
 #define EMMC_CMD17			17
 #define EMMC_CMD18			18
+#define EMMC_CMD21			21
 #define EMMC_CMD23			23
 #define EMMC_CMD24			24
 #define EMMC_CMD25			25
@@ -61,6 +62,8 @@
 #define EMMC_BUS_WIDTH_1		0
 #define EMMC_BUS_WIDTH_4		1
 #define EMMC_BUS_WIDTH_8		2
+#define EMMC_BUS_WIDTH_DDR_4		5
+#define EMMC_BUS_WIDTH_DDR_8		6
 #define EMMC_BOOT_MODE_BACKWARD		(0 << 3)
 #define EMMC_BOOT_MODE_HS_TIMING	(1 << 3)
 #define EMMC_BOOT_MODE_DDR		(2 << 3)