diff options
| author | David Brownell <david-b@pacbell.net> | 2007-07-23 18:43:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-24 12:24:59 -0700 |
| commit | be1ff386e768ee4fc19bb7da48cee4fc4cb4e75b (patch) | |
| tree | 56b1dc6b7220d8f32688acdb214318c5842b017b /Documentation/gpio.txt | |
| parent | 6570c45995a6339597462434a81f358a38941ac4 (diff) | |
| download | lwn-be1ff386e768ee4fc19bb7da48cee4fc4cb4e75b.tar.gz lwn-be1ff386e768ee4fc19bb7da48cee4fc4cb4e75b.zip | |
minor gpio doc update
Fix doc bug noted by Uwe Kleine-König: gpio_set_direction() is long
gone, replaced by gpio_direction_input() and gpio_direction_output().
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/gpio.txt')
| -rw-r--r-- | Documentation/gpio.txt | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index 218a8650f48d..6bc2ba215df9 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt @@ -148,7 +148,7 @@ pin ... that won't always match the specified output value, because of issues including wire-OR and output latencies. The get/set calls have no error returns because "invalid GPIO" should have -been reported earlier in gpio_set_direction(). However, note that not all +been reported earlier from gpio_direction_*(). However, note that not all platforms can read the value of output pins; those that can't should always return zero. Also, using these calls for GPIOs that can't safely be accessed without sleeping (see below) is an error. @@ -239,7 +239,7 @@ map between them using calls like: Those return either the corresponding number in the other namespace, or else a negative errno code if the mapping can't be done. (For example, some GPIOs can't used as IRQs.) It is an unchecked error to use a GPIO -number that hasn't been marked as an input using gpio_set_direction(), or +number that wasn't set up as an input using gpio_direction_input(), or to use an IRQ number that didn't originally come from gpio_to_irq(). These two mapping calls are expected to cost on the order of a single |