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authorAnton Vorontsov <avorontsov@ru.mvista.com>2007-07-31 00:38:43 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-31 15:39:40 -0700
commit4ef7af50373778ee248a2493c9cf62a2299806a8 (patch)
tree7cdf8e9415a8ee3dbd4dce86b1b6cd2a5927c861 /include/linux/spi
parent35cc0b975057389548bfe5703d438fe0deb4807e (diff)
SPI loopback mode definition
Loopback mode is supported by various controllers. This mode can be useful for testing, especially in conjunction with spidev driver. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/spi')
-rw-r--r--include/linux/spi/spi.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 302b81d1d117..e180615ed25a 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -77,6 +77,7 @@ struct spi_device {
#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 */
+#define SPI_LOOP 0x20 /* loopback mode */
u8 bits_per_word;
int irq;
void *controller_state;