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-rw-r--r--include/linux/spi/spi.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 743c933ac4e..c47c4b4da97 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -250,6 +250,10 @@ struct spi_master {
/* spi_device.mode flags understood by this controller driver */
u16 mode_bits;
+ /* other constraints relevant to this driver */
+ u16 flags;
+#define SPI_MASTER_HALF_DUPLEX BIT(0) /* can't do full duplex */
+
/* Setup mode and clock, etc (spi driver may call many times).
*
* IMPORTANT: this may be called when transfers to another