tests: drivers: pwm: Add PWM support for Renesas RZ/A3UL

Add PWM test support for Renesas RZ/A3UL-SMARC

Signed-off-by: Hieu Nguyen <[email protected]>
Signed-off-by: Tien Nguyen <[email protected]>

Author: Hieu Nguyen

tests/drivers/pwm/pwm_api/boards/rza3ul_smarc.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&mtu1 {
+	prescaler = <4>;
+	status = "okay";
+
+	pwm1: pwm {
+		status = "okay";
+		pinctrl-0 = <&mtu1_pins>;
+		pinctrl-names = "default";
+	};
+};

tests/drivers/pwm/pwm_api/src/test_pwm.c

@@ -59,6 +59,9 @@
 #elif DT_HAS_COMPAT_STATUS_OKAY(renesas_rz_gpt_pwm)
 #define PWM_DEV_NODE DT_INST(0, renesas_rz_gpt_pwm)
 
+#elif DT_HAS_COMPAT_STATUS_OKAY(renesas_rz_mtu_pwm)
+#define PWM_DEV_NODE DT_INST(0, renesas_rz_mtu_pwm)
+
 #else
 #error "Define a PWM device"
 #endif

tests/drivers/pwm/pwm_loopback/boards/rza3ul_smarc.overlay

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/pwm/renesas_rz_pwm.h>
+
+/ {
+	pwm_loopback_0 {
+		compatible = "test-pwm-loopback";
+		pwms = <&pwm1 RZ_PWM_MTIOCxA 0 PWM_POLARITY_NORMAL>,
+		       <&pwm3 RZ_PWM_MTIOCxA 0 PWM_POLARITY_NORMAL>;
+	};
+};
+
+&mtu1 {
+	prescaler = <1024>;
+	status = "okay";
+
+	pwm1: pwm {
+		status = "okay";
+		pinctrl-0 = <&mtu1_pins>;
+		pinctrl-names = "default";
+	};
+};
+
+&mtu3 {
+	status = "okay";
+
+	pwm3: pwm {
+		status = "okay";
+		pinctrl-0 = <&mtu3_pins>;
+		pinctrl-names = "default";
+	};
+};