From: David Brownell <dbrownell@users.sourceforge.net>
Date: Tue, 22 Sep 2009 23:46:18 +0000 (-0700)
Subject: spi: handle TX-only/RX-only
X-Git-Tag: v2.6.32-rc1~274
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=568d0697f42771425ae9f1e9a3db769fef7e10b6;p=pandora-kernel.git

spi: handle TX-only/RX-only

Support two new half-duplex SPI implementation restrictions, for links
that talk to TX-only or RX-only devices.  (Existing half-duplex flavors
support both transfer directions, just not at the same time.)

Move spi_async() into the spi.c core, and stop inlining it.  Then make
that function perform error checks and reject messages that demand more
than the underlying controller can support.

Based on a patch from Marek Szyprowski which did this only for the
bitbanged GPIO driver.

Cc: Marek Szyprowski <m.szyprowski@samsung.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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