zephyr/tests/drivers/uart/uart_async_api/boards/atsamr21_xpro.overlay

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/* SPDX-License-Identifier: Apache-2.0 */
&sercom3 {
status = "okay";
compatible = "atmel,sam0-uart";
current-speed = <115200>;
/* Internally loop-back TX and RX on PAD0 */
rxpo = <0>;
txpo = <0>;
/* Configure DMA channels for async operation */
dmas = <&dmac 0 7>, <&dmac 1 8>;
dma-names = "rx", "tx";
};