diff --git a/include/spi.h b/include/spi.h
index b714886..3a92d02 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -38,6 +38,9 @@
 
 #define SPI_DEFAULT_WORDLEN	8
 
+#define SPI_3BYTE_MODE 0x0
+#define SPI_4BYTE_MODE 0x1
+
 /* SPI transfer flags */
 #define SPI_XFER_STRIPE	(1 << 6)
 #define SPI_XFER_MASK	(3 << 8)
@@ -172,6 +175,7 @@
 	 * at once.
 	 */
 	bool multi_cs_cap;
+	u32 bytemode;
 };
 
 /**