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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>
hifive-unleashed-5.1
David Brownell 2007-07-19 01:47:52 -07:00 committed by Linus Torvalds
parent e53252d97e
commit a0a9983509
1 changed files with 3 additions and 0 deletions
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3
Documentation/gpio.txt
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@ -75,6 +75,9 @@ using the include file:
If you stick to this convention then it'll be easier for other developers to
see what your code is doing, and help maintain it.
Note that these operations include I/O barriers on platforms which need to
use them; drivers don't need to add them explicitly.
Identifying GPIOs
-----------------