gpio: gpio_sch: error when configure for level triggers

The GPIO controller only supports edge triggering according to
the descriptions of the associated registers. So errors out
when level trigger is requested. Also adds the option to do
double edges triggering as the controller supports this.

Fixes #12763

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

drivers/gpio/gpio_sch.c

@@ -96,7 +96,10 @@ static void _gpio_pin_config(struct device *dev, u32_t pin, int flags)
 	_set_bit_gio(info->regs, pin, !(flags & GPIO_DIR_MASK));
 
 	if (flags & GPIO_INT) {
-		if (flags & GPIO_INT_ACTIVE_HIGH) {
+		if (flags & GPIO_INT_DOUBLE_EDGE) {
+			active_high = 1U;
+			active_low = 1U;
+		} else if (flags & GPIO_INT_ACTIVE_HIGH) {
 			active_high = 1U;
 		} else {
 			active_low = 1U;
@@ -128,6 +131,12 @@ static int gpio_sch_config(struct device *dev,
 {
 	const struct gpio_sch_config *info = dev->config->config_info;
 
+	/* Do some sanity check first */
+	if (flags & (GPIO_INT | GPIO_INT_LEVEL)) {
+		/* controller does not support level trigger */
+		return -EINVAL;
+	}
+
 	if (access_op == GPIO_ACCESS_BY_PIN) {
 		if (pin >= info->bits) {
 			return -EINVAL;