/dts-v1/; /plugin/; / { compatible = "brcm,bcm2708"; fragment@0 { target-path = "/"; __overlay__ { pps: pps { compatible = "pps-gpio"; pinctrl-names = "default"; pinctrl-0 = <&pps_pins>; gpios = <&gpio 18 0>; status = "okay"; }; }; }; fragment@1 { target = <&gpio>; __overlay__ { pps_pins: pps_pins { brcm,pins = <18>; brcm,function = <0>; // in brcm,pull = <0>; // off }; }; }; __overrides__ { gpiopin = <&pps>,"gpios:4", <&pps_pins>,"brcm,pins:0"; assert_falling_edge = <&pps>,"assert-falling-edge?"; }; };