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Commit be1ff386 authored by David Brownell's avatar David Brownell Committed by Linus Torvalds
Browse files

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: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Cc: <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6570c459

Documentation/gpio.txt

+2 −2
Original line number Diff line number Diff line
@@ -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