1Device-Tree Bindings for a PPS Signal on GPIO
2
3These properties describe a PPS (pulse-per-second) signal connected to
4a GPIO pin.
5
6Required properties:
7- compatible: should be "pps-gpio"
8- gpios: one PPS GPIO in the format described by ../gpio/gpio.txt
9
10Additional required properties for the PPS ECHO functionality:
11- echo-gpios: one PPS ECHO GPIO in the format described by ../gpio/gpio.txt
12- echo-active-ms: duration in ms of the active portion of the echo pulse
13
14Optional properties:
15- assert-falling-edge: when present, assert is indicated by a falling edge
16                       (instead of by a rising edge)
17
18Example:
19	pps {
20		pinctrl-names = "default";
21		pinctrl-0 = <&pinctrl_pps>;
22
23		gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
24		assert-falling-edge;
25
26		echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
27		echo-active-ms = <100>;
28
29		compatible = "pps-gpio";
30	};
31