Beaglebone RS485 DTS

/*
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/dts-v1/;
/plugin/;

/ {
    compatible = "ti,beaglebone", "ti,beaglebone-black";

    /* identification */
    part-number = "BB-BONE-EXT-485";
    version = "00A0";

    exclusive-use =
        "P9.21", /* UART2_RXD */
        "P9.22", /* UART2_TXD */
        "P9.12",
        "gpio1_28", /* UART2_RTS */
        "uart2";

    fragment@0 {
        target = <&am33xx_pinmux>;
        __overlay__ {
            bb_rs485_ext_pins: pinmux_bb_rs485_ext_pins {
                pinctrl-single,pins = <
                         0x150 0x21  /* P0_3 = UART2_RXD, MODE1 */
                         0x154 0x01  /* P0_2 = UART2_TXD, MODE1 */
                         0x078 0x07
                 >;
            };
        };
    };

    fragment@1{
        target = <&uart3>; /* note we are really using uart2 but say uart3 here to force creation of /dev/ttyO2 */
        __overlay__ {
        pinctrl-names = "default";
        pinctrl-0 = <&bb_rs485_ext_pins>;
        rs485-rts-delay = <0 0>;
        rts-gpio = <&gpio1 28 0>;
        rs485-rts-active-high;
        linux,rs485-enabled-at-boot-time;
        status = "okay";
        };
    };
};