If you have the file, i’m interested since some weeks too… I have started to investigating for ar150 and Neo-GPS with pps output.
And normally everything is ready (even ntpd with ATOM driver “normally”), I only need to know how to modify the file “target/linux/ar71xx/files/arch/mips/ath79/mach-gl-ar150.c” to initializing the right gpio pin for pps input. And how to easily disable console on an atheros (as disable console=null) seem not enough.