Xavier doesn’t have a pin to support that function (PPS signal) in hardware.
you may have software modification to emulated PPS signal by using GPIO as PPS interface.
CONFIG_PPS and CONFIG_PPS_CLIENT_GPIO are already enabled in kernel.
please add Device tree node in kernel dtb anywhere inside dtsi like following:
gpios = <&tegra_aon_gpio TEGRA194_AON_GPIO(AA, 0) GPIO_ACTIVE_LOW>; //// here use gpio for the pin in which you want pps signal.
compatible = "pps-gpio";
status = "okay";
after system boots, you will see sysfs node for PPS.
$ ls /sys/class/pps/pps0/
Whenever interrupt occurs on falling edge of signal of gpio pin, timestamp will be captured and seen using: