I have what I think is a working DTS as the UART is working fine but I
cannot get the system to read the PPS from a GPS unit I have connected.
Below is my DTS and the UART 4 is working fine and I have the GPS's PPS
connected to P8-26 and so I'm hoping my DTS puts it into Mode7 on that pin.
PPS support is inside my kernel
Any ideas at all?
Lee
/*
* Copyright (C) 2013 the8thlayerof.net
*
* GPS cape for UART4
*
* 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 = "T8LO-GPS";
version = "00A0";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.11", /* uart4_rxd */
"P9.13", /* uart4_txd */
"P8.26", /* gpio1_29 */
/* the hardware ip uses */
"uart4",
"gpio1_29";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
gps_uart4_pins: pinmux_gps_uart4_pins {
pinctrl-single,pins = <
0x70 0x26 /* P9.11
uart4_rxd.uart4_rxd MODE6 INPUT (RX) */
0x74 0x26 /* P9.13
uart4_txd.uart4_rxd MODE6 OUTPUT (TX) */
>;
};
gps_pps_pins: pinmux_gps_pps_pins {
pinctrl-single,pins = <
0x7c 0x27 /* P8.26 gpio1_29 */
>;
};
};
};
fragment@1 {
target = <&uart5>; /* really uart4 */
__overlay__ {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&gps_uart4_pins>;
};
};
fragment@2 {
target = <&ocp>;
__overlay__ {
pps {
compatible = "pps-gpio";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&gps_pps_pins>;
gpios = <&gpio2 7 0 >;
assert-rising-edge;
};
};
};
};
--
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