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Diffstat (limited to '')
| -rw-r--r-- | Documentation/devicetree/bindings/pps/pps-gpio.txt | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pps/pps-gpio.txt b/Documentation/devicetree/bindings/pps/pps-gpio.txt new file mode 100644 index 000000000..9012a2a02 --- /dev/null +++ b/Documentation/devicetree/bindings/pps/pps-gpio.txt @@ -0,0 +1,30 @@ +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"; + }; |