spi_mpc83xx: support loopback mode
This exposes the hardware loopback mode to drivers, primarily for testing. 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>
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