tests: drivers: comparator: stm32 comparator support

add support for nucleo_g474re and nucleo_h745zi_q boards

Signed-off-by: Alexander Kozhinov <[email protected]>

Author: KozhinovAlexander

tests/drivers/comparator/gpio_loopback/boards/nucleo_g474re_stm32g474xx.overlay

@@ -0,0 +1,30 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright (c) 2025 Alexander Kozhinov <[email protected]>
+ */
+
+ #include <zephyr/dt-bindings/gpio/gpio.h>
+
+/ {
+	aliases {
+		test-comp = &comp1;
+	};
+
+	zephyr,user {
+		/* connected also to green led and will toggle it */
+		test-gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+/*
+ * IMPORTANT: CN8.A1 (PA1) shall be connected to CN5.D13 (PA5) by a jumper wire
+ */
+
+&comp1 {
+	status = "okay";
+	pinctrl-0 = <&comp1_inp_pa1 &comp1_out_pa6>;
+	pinctrl-names = "default";
+	positive-input = "IN0";
+	negative-input = "1_4VREFINT";
+	invert-output = "NONINVERTED";
+};

tests/drivers/comparator/gpio_loopback/boards/nucleo_h745zi_q_stm32h745xx_m7.overlay

@@ -0,0 +1,30 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright (c) 2025 Alexander Kozhinov <[email protected]>
+ */
+
+ #include <zephyr/dt-bindings/gpio/gpio.h>
+
+/*
+ * IMPORTANT: D33 (PB0) shall be connected to D27 (PB2) by a jumper wire
+ */
+
+/ {
+	aliases {
+		test-comp = &comp1_ch1;
+	};
+
+	zephyr,user {
+		/* connected also to green led and will toggle it */
+		test-gpios = <&gpiob 0 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&comp1_ch1 {
+	status = "okay";
+	pinctrl-0 = <&comp1_inp_pb2 &comp1_out_pe12>;
+	pinctrl-names = "default";
+	positive-input = "IN1";
+	negative-input = "1_4VREFINT";
+	invert-output = "NONINVERTED";
+};

tests/drivers/comparator/gpio_loopback/testcase.yaml

@@ -37,3 +37,7 @@ tests:
       - nrf54l15dk/nrf54l15/cpuapp
       - nrf54lm20dk/nrf54lm20a/cpuapp
       - ophelia4ev/nrf54l15/cpuapp
+  drivers.comparator.gpio_loopback.stm32_comp:
+    platform_allow:
+      - nucleo_h745zi_q/stm32h745xx/m7
+      - nucleo_g474re/stm32g474xx