diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 5796b9d..e1dbd21 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -61,6 +61,7 @@
 #define MMC_TIMING_UHS_SDR104	4
 #define MMC_TIMING_UHS_DDR50	5
 #define MMC_TIMING_MMC_HS200	6
+#define MMC_TIMING_MMC_HS400	7
 
 #define MMC_SDR_MODE		0
 #define MMC_1_2V_DDR_MODE	1
@@ -296,6 +297,11 @@
 #define MMC_CAP2_CORE_RUNTIME_PM (1 << 19)
 /* Allows Asynchronous SDIO irq while card is in 4-bit mode */
 #define MMC_CAP2_ASYNC_SDIO_IRQ_4BIT_MODE (1 << 20)
+
+#define MMC_CAP2_HS400_1_8V	(1 << 21)        /* can support */
+#define MMC_CAP2_HS400_1_2V	(1 << 22)        /* can support */
+#define MMC_CAP2_HS400		(MMC_CAP2_HS400_1_8V | \
+				 MMC_CAP2_HS400_1_2V)
 	mmc_pm_flag_t		pm_caps;	/* supported pm features */
 
 	int			clk_requests;	/* internal reference counter */