On Mon, Apr 7, 2014 at 2:20 PM, Alexander Stein <[email protected]> wrote:
> From: Daniel Krueger <[email protected]> > > According to the datasheet, writing to the level register has no effect > when GPIO is programmed as input. Actually the the level register is > read-only when configured as input. Thus presetting the output level > before switching to output is _NOT_ possible. Any writes are lost! > Hence we set the level after configuring the GPIO as output. > But we cannot prevent a short low pulse if direction is set to high and > an external pull-up is connected. > > Signed-off-by: Daniel Krueger <[email protected]> > Signed-off-by: Alexander Stein <[email protected]> > --- > Changes in v2: > * Adjusted commited message to make clear that writes are lost when GPIO > is configured as input. No further comments, so I have applied this v2 version for v3.16. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
