Atheros ath10k spectral scan support

configname: CONFIG_ATH10K_SPECTRAL

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Atheros ath10k spectral scan support
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Say Y to enable access to the FFT/spectral data via debugfs.