tests: comparator: enable gpio_loopback for lpcxpresso55s36

enable gpio_loopback for lpcxpresso55s36

Signed-off-by: Zhaoxiang Jin <Zhaoxiang.Jin_1@nxp.com>

Author: ZhaoxiangJin

tests/drivers/comparator/gpio_loopback/boards/lpcxpresso55s36.overlay

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/gpio/gpio.h>
+
+/ {
+	aliases {
+		test-comp = &hscmp0;
+	};
+
+	zephyr,user {
+		/* P0-10 (LPC55S36-EVK J9-7) output connect to P1-5 (LPC55S36-EVK J9-9). */
+		test-gpios = <&gpio0 10 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&hscmp0 {
+	positive-mux-input = "IN3";
+	negative-mux-input = "DAC";
+	dac-vref-source = "VREFH1";
+	dac-value = <127>;
+};

tests/drivers/comparator/gpio_loopback/testcase.yaml

@@ -44,3 +44,6 @@ tests:
     platform_allow:
       - nucleo_h745zi_q/stm32h745xx/m7
       - nucleo_g474re/stm32g474xx
+  drivers.comparator.gpio_loopback.nxp_hscmp:
+    platform_allow:
+      - lpcxpresso55s36