Pinout: https://docs.google.com/spreadsheets/d/1U3z0Gb8HUEfCIMkvqzmhMpJfzRqjPXq7mFLC-hvbKlE/edit#gid=0

pps_pin7.dts

/dts-v1/;
/plugin/;
 
/ {
  compatible = "libretech,cc", "amlogic,s905x", "amlogic,meson-gxl";
 
  fragment@0 {
    target-path = "/";
    __overlay__ {
      pps_gpio: pps-gpio {
        compatible = "pps-gpio";
        gpios = <&gpio 98 0>;
        interrupt-parent = <&gpio_intc>;
        interrupts = <98 1>;
        assert-rising-edge;
        status = "okay";
      };
    };
  };
};

build with

dtc -I dts -O dtb pps_pin7.dts -o pps-pin7.dtbo

copy:

sudo cp pps-pin7.dtbo \
/opt/librecomputer/libretech-wiring-tool/libre-computer/aml-s905x-cc-v2/dt/

merge:

sudo ldto merge pps-pin7