lkml.org 
[lkml]   [2007]   [Mar]   [2]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [patch 2.6.20-rc2] gpio_direction_output() needs an initial value
FromMilan Svoboda <>
DateFri, 2 Mar 2007 08:20:47 +0100
> It's been pointed out that output GPIOs should have an initial value, to
> avoid signal glitching ... among other things, it can be some time 
before
> a driver is ready.  This patch corrects that oversight, fixing
> 
>  - documentation
>  - platforms supporting the GPIO interface
>  - users of that call (just one for now, others are pending)
> 
> Note that most platforms are clear about the hardware letting the output
> value be set before the pin direction is changed, but the s3c241x docs
> are vague on that topic ... so those chips might not avoid the glitches.
> 
> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Acked-by: Milan Svoboda <msvoboda@ra.rockwell.com>


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-03-02 08:23    [from the cache]
©2003-2008