pfSense

athp now loads correctly with the modules present and loader variable set:

[2.5.0-DEVELOPMENT][root@apu.stevew.lan]/root: cat /boot/loader.conf.local
if_athp_load="yes" 

[2.5.0-DEVELOPMENT][root@apu.stevew.lan]/root: kldstat
Id Refs Address                Size Name
 1   22 0xffffffff80200000  3123108 kernel
 2    1 0xffffffff83325000    d42f8 if_athp.ko
 3    1 0xffffffff83621000      a45 athp_QCA988X_hw2.0_board.bin.ko
 4    1 0xffffffff83622000    3cb9f athp_QCA988X_hw2.0_firmware-5.bin.ko
 5    1 0xffffffff8365f000      fe0 cpuctl.ko
 6    1 0xffffffff83660000     2678 intpm.ko
 7    1 0xffffffff83663000      b10 smbus.ko
 8    1 0xffffffff83664000     3110 cryptodev.ko

[2.5.0-DEVELOPMENT][root@apu.stevew.lan]/root: sysctl net.wlan.devices
net.wlan.devices: athp1 athp0

The driver is still in active development. ifconfig does not yet support 802.11AC mode.

Tested against: pfSense-2.5.0.a.20190820.1737