31 lines
860 B
Plaintext
31 lines
860 B
Plaintext
Device-Tree Bindings for a PPS Signal on GPIO
|
|
|
|
These properties describe a PPS (pulse-per-second) signal connected to
|
|
a GPIO pin.
|
|
|
|
Required properties:
|
|
- compatible: should be "pps-gpio"
|
|
- gpios: one PPS GPIO in the format described by ../gpio/gpio.txt
|
|
|
|
Additional required properties for the PPS ECHO functionality:
|
|
- echo-gpios: one PPS ECHO GPIO in the format described by ../gpio/gpio.txt
|
|
- echo-active-ms: duration in ms of the active portion of the echo pulse
|
|
|
|
Optional properties:
|
|
- assert-falling-edge: when present, assert is indicated by a falling edge
|
|
(instead of by a rising edge)
|
|
|
|
Example:
|
|
pps {
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&pinctrl_pps>;
|
|
|
|
gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
|
|
assert-falling-edge;
|
|
|
|
echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
|
|
echo-active-ms = <100>;
|
|
|
|
compatible = "pps-gpio";
|
|
};
|