hello kevin.loll,
you might refer to post #16 from Topic 124003, which produce pps signals on GPIO.
this driver is to feed pps signals in GPIO and capture timestamps to synchronize system every second.
BTW,
please check axi_cbb, please update this node with higher clock rate or max_rate to improve GPIO performance.
for example,
# cd /sys/kernel/debug/bpmp/debug/clk/axi_cbb
# echo max_rate > rate
# echo 1 > mrq_rate_locked