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spi: spi_bfin cleanups, error handling
Cleanup and error handling
- add error handling in SPI bus driver with selecting clients
- use proper defines to access Blackfin MMRs
- remove useless SSYNCs
- cleaner use of portmux calls
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.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>