1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 1be5ea059477..302b81d1d117 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -76,6 +76,7 @@ struct spi_device {
 #define SPI_MODE_3      (SPI_CPOL|SPI_CPHA)
 #define SPI_CS_HIGH     0x04                    /* chipselect active high? */
 #define SPI_LSB_FIRST   0x08                    /* per-word bits-on-wire */
+#define SPI_3WIRE       0x10                    /* SI/SO signals shared */
         u8                      bits_per_word;
         int                     irq;
         void                    *controller_state;