tests: drivers: dac: add xg24 boards to dac_api and dac_loopback tests

Add board overlays and defines to the test sources files to execute
the dac_api and dac_loopback tests on xg24_dk2601b and xg24_rb4187c.

Signed-off-by: Bastien Beauchamp <[email protected]>

Author: silabs-BastienB

tests/drivers/dac/dac_api/boards/xg24_dk2601b.overlay

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/dac/silabs-vdac.h>
+
+&vdac0 {
+	status = "okay";
+	voltage-reference = "1.25V";
+
+	channel@0 {
+		reg = <0>;
+		aux-output = <VDAC_OUTPUT_AUX>;
+	};
+};

tests/drivers/dac/dac_api/boards/xg24_rb4187c.overlay

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/dac/silabs-vdac.h>
+
+&vdac0 {
+	status = "okay";
+	voltage-reference = "1.25V";
+
+	channel@0 {
+		reg = <0>;
+		aux-output = <VDAC_OUTPUT_AUX>;
+	};
+};

tests/drivers/dac/dac_api/src/test_dac.c

@@ -114,6 +114,12 @@
 #define DAC_RESOLUTION	12
 #define DAC_CHANNEL_ID	0
 
+#elif defined(CONFIG_SOC_FAMILY_SILABS_S2)
+
+#define DAC_DEVICE_NODE		DT_NODELABEL(vdac0)
+#define DAC_RESOLUTION	12
+#define DAC_CHANNEL_ID	0
+
 #else
 #error "Unsupported board."
 #endif

tests/drivers/dac/dac_loopback/boards/xg24_dk2601b.overlay

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/adc/silabs-adc.h>
+#include <zephyr/dt-bindings/dac/silabs-vdac.h>
+
+&adc0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+		zephyr,input-positive = <IADC_INPUT_DAC0>;
+	};
+};
+
+&vdac0 {
+	status = "okay";
+	voltage-reference = "AVDD";
+
+	channel@0 {
+		reg = <0>;
+		aux-output = <VDAC_OUTPUT_AUX>;
+	};
+};

tests/drivers/dac/dac_loopback/boards/xg24_rb4187c.overlay

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/adc/silabs-adc.h>
+#include <zephyr/dt-bindings/dac/silabs-vdac.h>
+
+&adc0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+		zephyr,input-positive = <IADC_INPUT_DAC0>;
+	};
+};
+
+&vdac0 {
+	status = "okay";
+	voltage-reference = "AVDD";
+
+	channel@0 {
+		reg = <0>;
+		aux-output = <VDAC_OUTPUT_AUX>;
+	};
+};

tests/drivers/dac/dac_loopback/src/test_dac.c

@@ -184,6 +184,24 @@
 #define ADC_CHANNEL_ID 0
 #endif
 
+#elif defined(CONFIG_SOC_FAMILY_SILABS_S2)
+
+/* VDAC0CH0 output is internally available on IADC_INPUT_DAC0 */
+
+#include <zephyr/dt-bindings/adc/silabs-adc.h>
+
+#define DAC_DEVICE_NODE		DT_NODELABEL(vdac0)
+#define DAC_RESOLUTION		12
+#define DAC_CHANNEL_ID		0
+
+#define ADC_DEVICE_NODE		DT_NODELABEL(adc0)
+#define ADC_RESOLUTION		12
+#define ADC_GAIN		ADC_GAIN_1
+#define ADC_REFERENCE		ADC_REF_VDD_1
+#define ADC_ACQUISITION_TIME	ADC_ACQ_TIME_DEFAULT
+#define ADC_CHANNEL_ID		0
+#define ADC_1ST_CHANNEL_INPUT	IADC_INPUT_DAC0
+
 #else
 #error "Unsupported board."
 #endif
@@ -208,7 +226,8 @@ static const struct adc_channel_cfg adc_ch_cfg = {
 	defined(CONFIG_BOARD_BL653_DVK) || \
 	defined(CONFIG_BOARD_BL654_DVK) || \
 	defined(CONFIG_BOARD_BL5340_DVK) || \
-	defined(CONFIG_BOARD_LPCXPRESSO55S36)
+	defined(CONFIG_BOARD_LPCXPRESSO55S36) || \
+	defined(CONFIG_SOC_FAMILY_SILABS_S2)
 	.input_positive   = ADC_1ST_CHANNEL_INPUT,
 #endif
 };

tests/drivers/dac/dac_loopback/testcase.yaml

@@ -29,5 +29,6 @@ tests:
       - nucleo_g071rb
       - nucleo_wl55jc
       - lpcxpresso55s36
+      - xg24_dk2601b
     integration_platforms:
       - nucleo_f207zg