tests: gpio: gpio_basic_api: config to input if disconnected not supported

If GPIO_DISCONNECTED is not supported by GPIO driver, then try to configure
the pin to be input, otherwise there will be some unstable signal between
two test pins.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>

Author: JiafeiPan

tests/drivers/gpio/gpio_basic_api/src/test_config_trigger.c

@@ -30,6 +30,11 @@ ZTEST(after_flash_gpio_config_trigger, test_gpio_config_twice_trigger)
 	cb_cnt = 0;
 
 	ret = gpio_pin_configure(dev_out, PIN_OUT, GPIO_DISCONNECTED);
+	if (ret == -ENOTSUP) {
+		TC_PRINT("NOTE: cannot configure pin as disconnected; trying as input\n");
+		ret = gpio_pin_configure(dev_out, PIN_OUT, GPIO_INPUT | GPIO_PULL_UP);
+	}
+	zassert_ok(ret, "config PIN_OUT failed");
 
 	/* 1. Configure PIN_IN callback */
 	ret = gpio_pin_configure(dev_in, PIN_IN, GPIO_INPUT);
@@ -81,6 +86,11 @@ ZTEST(after_flash_gpio_config_trigger, test_gpio_config_trigger)
 	cb_cnt = 0;
 
 	ret = gpio_pin_configure(dev_out, PIN_OUT, GPIO_DISCONNECTED);
+	if (ret == -ENOTSUP) {
+		TC_PRINT("NOTE: cannot configure pin as disconnected; trying as input\n");
+		ret = gpio_pin_configure(dev_out, PIN_OUT, GPIO_INPUT | GPIO_PULL_UP);
+	}
+	zassert_ok(ret, "config PIN_OUT failed");
 
 	/* 1. Configure PIN_IN callback */
 	ret = gpio_pin_configure(dev_in, PIN_IN, GPIO_INPUT);