samples: drivers: adc: adc_dt: Enable sample on nrf54lm20dk

Add overlay required to run the sample on
nrf54lm20dk/nrf54lm20a/cpuapp.

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

Author: nordic-segl

samples/drivers/adc/adc_dt/boards/nrf54lm20dk_nrf54lm20a_cpuapp.overlay

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc 0>, <&adc 1>, <&adc 2>, <&adc 7>;
+	};
+};
+
+&adc {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,input-positive = <NRF_SAADC_AIN4>; /* P1.06 */
+		zephyr,resolution = <10>;
+	};
+
+	channel@1 {
+		reg = <1>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,input-positive = <NRF_SAADC_AIN2>; /* P1.30 */
+		zephyr,resolution = <12>;
+		zephyr,oversampling = <8>;
+	};
+
+	channel@2 {
+		reg = <2>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,input-positive = <NRF_SAADC_VDD>;
+		zephyr,resolution = <12>;
+		zephyr,oversampling = <8>;
+	};
+
+	channel@7 {
+		reg = <7>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,input-positive = <NRF_SAADC_AIN6>; /* P1.04 */
+		zephyr,input-negative = <NRF_SAADC_AIN7>; /* P1.03 */
+		zephyr,resolution = <12>;
+	};
+};

samples/drivers/adc/adc_dt/sample.yaml

@@ -15,8 +15,9 @@ tests:
       - stm32h735g_disco
       - nrf51dk/nrf51822
       - nrf52840dk/nrf52840
-      - nrf54l15dk/nrf54l15/cpuapp
       - nrf54h20dk/nrf54h20/cpuapp
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54lm20dk/nrf54lm20a/cpuapp
       - ophelia4ev/nrf54l15/cpuapp
       - mec172xevb_assy6906
       - gd32f350r_eval