samples: dac: Add DAC support for Renesas RA4 boards

Add support DAC for ek_ra4m1, ek_ra4w1, fpb_ra4e1,
voice_ra4e1, ek_ra4l1

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

Author: khoa-nguyen-18

samples/drivers/dac/Kconfig

@@ -1,6 +1,7 @@
 # Private config options for dac sample
 
 # Copyright (c) 2025 NXP
+# Copyright (c) 2025 Renesas Electronics Corporation
 # SPDX-License-Identifier: Apache-2.0
 
 mainmenu "DAC sample application"
@@ -14,3 +15,8 @@ config DAC_SAMPLE_RUN
 	default y if $(dt_node_has_prop,/$(ZEPHYR_USER),dac)
 	help
 	  platform supports dac sample
+
+config DAC_BUFFER_NOT_SUPPORT
+	bool "DAC on board/SoC does not support output buffer mode"
+	help
+	  If this config is turned on, the sample will run with no output buffer enabled

samples/drivers/dac/boards/ek_ra4l1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

samples/drivers/dac/boards/ek_ra4l1.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		dac = <&dac0>;
+		dac-channel-id = <0>;
+		dac-resolution = <12>;
+	};
+};

samples/drivers/dac/boards/ek_ra4m1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

samples/drivers/dac/boards/ek_ra4m1.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		dac = <&dac0>;
+		dac-channel-id = <0>;
+		dac-resolution = <12>;
+	};
+};

samples/drivers/dac/boards/ek_ra4w1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

samples/drivers/dac/boards/ek_ra4w1.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		dac = <&dac0>;
+		dac-channel-id = <0>;
+		dac-resolution = <12>;
+	};
+};

samples/drivers/dac/boards/fpb_ra4e1.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		dac = <&dac0>;
+		dac-channel-id = <0>;
+		dac-resolution = <12>;
+	};
+};

samples/drivers/dac/boards/voice_ra4e1.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		dac = <&dac0>;
+		dac-channel-id = <0>;
+		dac-resolution = <12>;
+	};
+};

samples/drivers/dac/src/main.c

@@ -28,7 +28,11 @@ static const struct device *const dac_dev = DEVICE_DT_GET(DAC_NODE);
 static const struct dac_channel_cfg dac_ch_cfg = {
 	.channel_id  = DAC_CHANNEL_ID,
 	.resolution  = DAC_RESOLUTION,
-	.buffered = true
+#if defined(CONFIG_DAC_BUFFER_NOT_SUPPORT)
+	.buffered = false,
+#else
+	.buffered = true,
+#endif /* CONFIG_DAC_BUFFER_NOT_SUPPORT */
 };
 
 int main(void)