From a0a9983509f45b2225ca87fdcf7b40ea916834ed Mon Sep 17 00:00:00 2001 From: David Brownell Date: Thu, 19 Jul 2007 01:47:52 -0700 Subject: [PATCH] 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/gpio.txt | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index 36af58eba1..218a8650f4 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt @@ -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 ----------------- -- 2.39.5