diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 48be19a..6496f88 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -292,6 +292,8 @@
 #define MMC_CAP2_STOP_REQUEST	(1 << 18)	/* Allow stop ongoing request */
 /* Use runtime PM framework provided by MMC core */
 #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)
 	mmc_pm_flag_t		pm_caps;	/* supported pm features */
 
 	int			clk_requests;	/* internal reference counter */