[U-Boot] [PATCH] dm: gpio: handle GPIO_ACTIVE_LOW flag in DT

Eric Nelson
2016-03-25T20:12:11Z

Device tree parsing of GPIO nodes is currently ignoring flags.

Add support for GPIO_ACTIVE_LOW by checking for the presence
of the flag and setting the desc->flags field to the driver
model constant GPIOD_ACTIVE_LOW.

Signed-off-by: Eric Nelson <eric@nelint.com>
---
drivers/gpio/gpio-uclass.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index b58d4e6..6d30612 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -6,6 +6,7 @@

#include <common.h>
#include <dm.h>
+#include <dt-bindings/gpio/gpio.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
@@ -118,12 +119,16 @@ static int gpio_find_and_xlate(struct gpio_desc *desc,
{
struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);

+ desc->flags = 0;
/* Use the first argument as the offset by default */
- if (args->args_count > 0)
+ if (args->args_count > 0) {
desc->offset = args->args[0];
+ if ((args->args_count > 1) &&
+ (args->args[1] & GPIO_ACTIVE_LOW))
+ desc->flags = GPIOD_ACTIVE_LOW;
+ }
else
desc->offset = -1;
- desc->flags = 0;

return ops->xlate ? ops->xlate(desc->dev, desc, args) : 0;
}
--
2.6.2