zephyr/tests/drivers/spi/spi_loopback/boards/atsamd21_xpro.overlay

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/*
* Copyright (c) 2020 Stephanos Ioannidis <root@stephanos.io>
*
* SPDX-License-Identifier: Apache-2.0
*/
&sercom5 {
/* Internally connect MOSI to MISO for loop-back operation */
dipo = <0>;
dopo = <0>;
};