tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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 };