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Anton Vorontsov committed 4ef7af50373
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>