mirrors/u-boot
0
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2024-11-25 21:24:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

mxc_gpio: Correct the GPIO handling in gpio_direction_output()

Browse Source 
Setting the direction and an output value should be done by

First, set the desired output value.

Then, switch to output.

If this is done in the inverse order, like at the moment,
there can be a glitch on the GPIO line while switching first
the old output value and aftwards the new one.

Fix this by inverting the order of the direction/set_value
calls.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Acked-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Dirk Behme 2013-07-15 15:58:27 +02:00 committed by Stefano Babic
parent 5434caf5ba
commit 04c79cbd5f
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpio/mxc_gpio.c
View File

@ -143,10 +143,10 @@ int gpio_direction_input(unsigned gpio)
int gpio_direction_output(unsigned gpio, int value)
{
int ret = mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
int ret = gpio_set_value(gpio, value);
if (ret < 0)
return ret;
return gpio_set_value(gpio, value);
return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
}