1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/mmc/protocol.h b/include/linux/mmc/protocol.h
index 311b6547f561..45c51fd85786 100644
--- a/include/linux/mmc/protocol.h
+++ b/include/linux/mmc/protocol.h
@@ -256,6 +256,7 @@ struct _mmc_csd {
  * EXT_CSD fields
  */
 
+#define EXT_CSD_BUS_WIDTH       183     /* R/W */
 #define EXT_CSD_HS_TIMING       185     /* R/W */
 #define EXT_CSD_CARD_TYPE       196     /* RO */
 
@@ -270,6 +271,10 @@ struct _mmc_csd {
 #define EXT_CSD_CARD_TYPE_26    (1<<0)  /* Card can run at 26MHz */
 #define EXT_CSD_CARD_TYPE_52    (1<<1)  /* Card can run at 52MHz */
 
+#define EXT_CSD_BUS_WIDTH_1     0       /* Card is in 1 bit mode */
+#define EXT_CSD_BUS_WIDTH_4     1       /* Card is in 4 bit mode */
+#define EXT_CSD_BUS_WIDTH_8     2       /* Card is in 8 bit mode */
+
 /*
  * MMC_SWITCH access modes
  */