[PATCH 4/4] gpio: dw: add get_direction callback

[Sebastian Hesselbarth]

This adds a callback function to read the current state of a GPIOs
in/out direction.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
---
Cc: barebox at lists.infradead.org
---
 drivers/gpio/gpio-dw.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpio/gpio-dw.c b/drivers/gpio/gpio-dw.c
index 791488a..6577042 100644
--- a/drivers/gpio/gpio-dw.c
+++ b/drivers/gpio/gpio-dw.c
@@ -90,9 +90,18 @@ static int dw_gpio_direction_output(struct gpio_chip *gc,
 	return 0;
 }
 
+static int dw_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
+{
+	struct dw_gpio_instance *chip = to_dw_gpio(gc);
+
+	return (readl(chip->regs + DW_GPIO_DDR) & (1 << offset)) ?
+		GPIO_DIR_OUT : GPIO_DIR_IN;
+}
+
 static struct gpio_ops imx_gpio_ops = {
 	.direction_input = dw_gpio_direction_input,
 	.direction_output = dw_gpio_direction_output,
+	.get_direction = dw_gpio_get_direction,
 	.get = dw_gpio_get,
 	.set = dw_gpio_set,
 };
-- 
1.8.4.rc3