drivers: gpio: omap: add support for parsing additional gpio parameters

With DM_GPIO, gpio parameters like ACTIVE_(LOW/HIGH) are to be
parsed in xlate gpio drivers-ops. Since xlate is not implemented
in omap_gpio driver, the driver considers all gpio to be
ACTIVE_HIGH which is the default case and fails to return actual
gpio status for ACTIVE_LOW gpios. So adding .xlate ops to
omap_gpio.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/gpio/omap_gpio.c

@@ -25,6 +25,7 @@
 #include <asm/io.h>
 #include <asm/errno.h>
 #include <malloc.h>
+#include <dt-bindings/gpio/gpio.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -276,12 +277,22 @@ static int omap_gpio_get_function(struct udevice *dev, unsigned offset)
 		return GPIOF_INPUT;
 }
 
+static int omap_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
+			   struct fdtdec_phandle_args *args)
+{
+	desc->offset = args->args[0];
+	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
+
+	return 0;
+}
+
 static const struct dm_gpio_ops gpio_omap_ops = {
 	.direction_input	= omap_gpio_direction_input,
 	.direction_output	= omap_gpio_direction_output,
 	.get_value		= omap_gpio_get_value,
 	.set_value		= omap_gpio_set_value,
 	.get_function		= omap_gpio_get_function,
+	.xlate			= omap_gpio_xlate,
 };
 
 static int omap_gpio_probe(struct udevice *dev)