samples: adc_sequence: add device tree overlay for xg29_rb4412a

This commit introduces a overlay for the xg29_rb4412a board.

Signed-off-by: Martin Hoff <[email protected]>

Author: Martinhoff-maker

samples/drivers/adc/adc_sequence/boards/xg29_rb4412a.overlay

@@ -0,0 +1,64 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ */
+
+#include <dt-bindings/pinctrl/silabs/xg29-pinctrl.h>
+#include <dt-bindings/adc/silabs-adc.h>
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 3>, <&adc0 4>, <&adc0 12>;
+	};
+
+	aliases {
+		adc0 = &adc0;
+	};
+};
+
+&pinctrl {
+	adc0_default: adc0_default {
+		group0 {
+			/* Allocate odd bus 0 on GPIO port C/D to IADC for access to pin PD3 */
+			silabs,analog-bus = <ABUS_CDODD0_IADC0>;
+		};
+	};
+};
+
+&adc0 {
+	pinctrl-0 = <&adc0_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	channel@3 {
+		reg = <3>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+		zephyr,input-positive = <IADC_INPUT_AVDD>;
+	};
+
+	channel@4 {
+		reg = <4>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,vref-mv = <3300>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+		zephyr,input-positive = <IADC_INPUT_PD3>;
+	};
+
+	channel@12 {
+		reg = <12>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,vref-mv = <3300>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+		zephyr,input-positive = <IADC_INPUT_PC3>;
+	};
+};

samples/drivers/adc/adc_sequence/sample.yaml

@@ -27,6 +27,7 @@ tests:
       - s32k148_evb
       - frdm_mcxc242
       - stm32f3_disco
+      - xg29_rb4412a
     integration_platforms:
       - nrf52840dk/nrf52840
   sample.drivers.adc.adc_sequence.8bit: