tests: drivers: pwm: gpio_loopback: Run test on nRF54LM20A

Enable test execution on nrf54lm20a.

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

CODEOWNERS

@@ -927,6 +927,7 @@
 /tests/subsys/suit/                       @nrfconnect/ncs-charon
 /tests/tfm/                               @nrfconnect/ncs-aegir @stephen-nordic @magnev
 /tests/unity/                             @nordic-krch
+/tests/zephyr/boards/nrf/                 @nrfconnect/ncs-low-level-test
 /tests/zephyr/drivers/adc/                @nrfconnect/ncs-low-level-test
 /tests/zephyr/drivers/audio/              @nrfconnect/ncs-low-level-test
 /tests/zephyr/drivers/clock_control/      @nrfconnect/ncs-low-level-test
@@ -939,7 +940,6 @@
 /tests/zephyr/drivers/i2c/i2c_target_api/ @nrfconnect/ncs-low-level-test
 /tests/zephyr/drivers/i2s/                @nrfconnect/ncs-low-level-test
 /tests/zephyr/drivers/mspi/api/           @nrfconnect/ncs-low-level-test @nrfconnect/ncs-ll-ursus
-/tests/zephyr/boards/nrf/                 @nrfconnect/ncs-low-level-test
 /tests/zephyr/drivers/retained_mem/       @nrfconnect/ncs-low-level-test
 /tests/zephyr/drivers/sensor/             @nrfconnect/ncs-low-level-test
 /tests/zephyr/drivers/spi/                @nrfconnect/ncs-low-level-test

tests/drivers/pwm/gpio_loopback/boards/nrf54lm20apdk_nrf54lm20a_cpuapp.overlay

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#include <zephyr/dt-bindings/pwm/pwm.h>
+#include <zephyr/dt-bindings/gpio/nordic-nrf-gpio.h>
+
+&pinctrl {
+	pwm20_alt: pwm20_alt {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 1, 10)>;
+		};
+	};
+
+	pwm20_alt_sleep: pwm20_alt_sleep {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 1, 10)>;
+			low-power-enable;
+		};
+	};
+};
+
+&pwm20 {
+	pinctrl-0 = <&pwm20_alt>;
+	pinctrl-1 = <&pwm20_alt_sleep>;
+	pinctrl-names = "default", "sleep";
+};
+
+/ {
+	pwm_to_gpio_loopback: pwm_to_gpio_loopback {
+		compatible = "test-pwm-to-gpio-loopback";
+		pwms = <&pwm20 0 0 PWM_POLARITY_NORMAL>;
+		gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
+	};
+};

tests/drivers/pwm/gpio_loopback/testcase.yaml

@@ -16,10 +16,12 @@ tests:
       - nrf54h20dk/nrf54h20/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
       - nrf54l20pdk/nrf54l20/cpuapp
+      - nrf54lm20apdk/nrf54lm20a/cpuapp
       - nrf7120pdk/nrf7120/cpuapp
     integration_platforms:
       - nrf54h20dk/nrf54h20/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54lm20apdk/nrf54lm20a/cpuapp
       - nrf7120pdk/nrf7120/cpuapp
 
   drivers.pwm.gpio_loopback.fast_p7_0: