tests/bluetooth/shell/usb_audio.overlay

/*
 * Copyright (c) 2025 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <dt-bindings/usb/audio.h>

/ {
	uac2_headset: usb_audio2 {
		compatible = "zephyr,uac2";
		status = "okay";
		full-speed;
		high-speed;
		audio-function = <AUDIO_FUNCTION_SUBCLASS_UNDEFINED>;

		/* Clock supporting 48KHz
		 *
		 * Since the incoming audio may be between 8 and 48 KHz, we always upsample to 48KHz
		 */
		uac_aclk: aclk {
			compatible = "zephyr,uac2-clock-source";
			clock-type = "internal-programmable";
			frequency-control = "read-only";
			sampling-frequencies = <48000>;
			/* Falsely claim synchronous audio because we
			 * currently don't calculate feedback value
			 */
			sof-synchronized;
		};

		/* USB Audio terminal from USB host to USB device */
		out_terminal: out_terminal {
			compatible = "zephyr,uac2-input-terminal";
			clock-source = <&uac_aclk>;
			terminal-type = <USB_TERMINAL_STREAMING>;
			front-left;
			front-right;
		};

		as_iso_out: out_interface {
			compatible = "zephyr,uac2-audio-streaming";
			linked-terminal = <&out_terminal>;
			subslot-size = <2>;
			bit-resolution = <16>;
		};

		/* USB Audio terminal from USB device to USB host */
		in_terminal: in_terminal {
			compatible = "zephyr,uac2-output-terminal";
			data-source = <&bt_input>;
			clock-source = <&uac_aclk>;
			terminal-type = <USB_TERMINAL_STREAMING>;
		};

		as_iso_in: in_interface {
			compatible = "zephyr,uac2-audio-streaming";
			linked-terminal = <&in_terminal>;
			subslot-size = <2>;
			bit-resolution = <16>;
		};

		/* The bt_output terminal defines what we are sending over Bluetooth */
		bt_output: headphones {
			compatible = "zephyr,uac2-output-terminal";
			data-source = <&out_terminal>;
			clock-source = <&uac_aclk>;
			terminal-type = <BIDIRECTIONAL_TERMINAL_UNDEFINED>;
			assoc-terminal = <&bt_input>;
		};

		/* The bt_input terminal defines what we are receiving over Bluetooth */
		bt_input: microphone {
			compatible = "zephyr,uac2-input-terminal";
			clock-source = <&uac_aclk>;
			terminal-type = <BIDIRECTIONAL_TERMINAL_UNDEFINED>;
			/* Circular reference, macros will figure it out and
			 * provide correct associated terminal ID because the
			 * terminals associations are always 1-to-1.
			 *
			 * assoc-terminal = <&bt_output>;
			 */
			front-left;
			front-right;
		};
	};
};