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/*
* Copyright 2018
* Yantrr Electronic Systems Pvt. Ltd. - http://www.yantrr.com/
*
* BeagleBone cape RS485 / RS422 using UART1-RTSCTS connector pins P9.19 P9.20
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
/dts-v1/;
/plugin/;
/{
/*
* Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/
*/
fragment@0 {
target-path="/";
__overlay__ {
chosen {
overlays {
BB-UART1-RTSCTS-00A0 = __TIMESTAMP__;
};
};
};
};
/*
* Free up the pins used by the cape from the pinmux helpers.
*/
fragment@1 {
target = <&ocp>;
__overlay__ {
P9_19_pinmux { status = "disabled"; }; /* P9_19: mode 0 (uart1_rtsn) */
P9_20_pinmux { status = "disabled"; }; /* P9_20: mode 0 (uart1_ctsn) */
};
};
fragment@2 {
target = <&am33xx_pinmux>;
__overlay__ {
u1_rtscts_pins: pinmux_u1_rtscts_pins {
pinctrl-single,pins = <
0x17c 0x08 /* P9_19: mode 0 (uart1_rtsn) */
0x178 0x30 /* P9_20: mode 0 (uart1_ctsn) */
>;
};
};
};
fragment@3 {
target = <&ocp>; /* On-Chip Peripherals */
__overlay__ {
uart1-rtscts-pinmux {
compatible = "bone-pinmux-helper"; /* Use the pinmux helper */
status="okay";
/* Define custom names for indexes in pinctrl array: */
pinctrl-names = "default";
/* Set the elements of the pinctrl array to the pinmux overlays
defined above: */
pinctrl-0 = <&u1_rtscts_pins>;
};
};
};
};
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