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(parent: e53252d) | patch
gpio calls don't need i/o barriers
authorDavid Brownell <david-b@pacbell.net>
Thu, 19 Jul 2007 08:47:52 +0000 (01:47 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Thu, 19 Jul 2007 17:04:43 +0000 (10:04 -0700)
commita0a9983509f45b2225ca87fdcf7b40ea916834ed
treea70151c57f184bccd24175fa19a585021e297973tree | snapshot
parente53252d97e670a38b1d2e9723b48077bba11dddacommit | diff
gpio calls don't need i/o barriers

Clarify that drivers using the GPIO operations don't need to issue io
barrier instructions themselves.  Previously this wasn't clear, and at
least one platform assumed otherwise (and would thus break various
otherwise-portable drivers which don't issue barriers).

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>
Documentation/gpio.txt diff | blob | history
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