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Atomic Pi

pps-gpio

PPS on GPIO1, LED on GPIO5

/dts-v1/;
/plugin/;

/ {
  fragment@0 {
    target-path="/";
    __overlay__ {
      pps: pps {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_pps>;
        gpios = <&gpiochip_stub_332 18 0>;
        assert-falling-edge;

        echo-gpios = <&gpiochip_stub_330 16 0>;
        echo-active-ms = <100>;

        compatible = "pps-gpio";
      };
    };
  };
};

build with:

dtc -I dts -O dtb -o /home/john/ppsgpio.dtb /home/john/pps-gpio.dts

kernel config options to add

CONFIG_OF=y
CONFIG_OF_DYNAMIC=y
CONFIG_OF_OVERLAY=y
CONFIG_OF_FLATTREE=y
CONFIG_OF_CONFIGFS=y
CONFIG_OF_GPIO_STUB=y
CONFIG_OF_ROOT_STUB=y
CONFIG_PPS=y
CONFIG_PPS_CLIENT_LDISC=y
CONFIG_PPS_CLIENT_GPIO=y
CONFIG_GPIO_SYSFS=y