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| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2007-07-31 00:38:43 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-31 15:39:40 -0700 |
| commit | 4ef7af50373778ee248a2493c9cf62a2299806a8 (patch) | |
| tree | 7cdf8e9415a8ee3dbd4dce86b1b6cd2a5927c861 /include/linux/spi | |
| parent | 35cc0b975057389548bfe5703d438fe0deb4807e (diff) | |
| download | lwn-4ef7af50373778ee248a2493c9cf62a2299806a8.tar.gz lwn-4ef7af50373778ee248a2493c9cf62a2299806a8.zip | |
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.h | 1 |
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; |