Simon Wunderlich [off-list ref] writes:

Adds the spectral scan feature for ath10k. The spectral scan is triggered by
configuring a mode through a debugfs control file. Samples can be gathered via
another relay debugfs file.

Essentially, to try it out:

ip link set dev wlan0 up
echo background > /sys/kernel/debug/ieee80211/phy0/ath10k/spectral_scan_ctl
iw dev wlan0 scan
echo disable > /sys/kernel/debug/ieee80211/phy0/ath10k/spectral_scan_ctl
cat /sys/kernel/debug/ieee80211/phy0/ath10k/spectral_scan0 > samples

This feature is still experimental. Based on the original RFC patch of
Sven Eckelmann.

Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Mathias Kretschmer <redacted>

While I was commiting this to ath-next-test for build tests and review,
I had a trivial conflict. Please check the patch:

https://github.com/kvalo/ath/commit/85dec746d1f4728176bd06a53b6da4ef014f2a27

Oddly enough with this patch I see a new warning:

include/uapi/linux/swab.h:71:16: error: undefined identifier '__builtin_bswap64'

But I guess there's not much we can do about that?

-- 
Kalle Valo