I have the same chipset (out of use now since I switched to powerline adapters). It worked well enough for me In FreeBSD 9.x/10.0/10.1 and 10.2 (ath driver). It also worked flawlessly with OpenBSD's athn driver and with DragonFly's ath driver. NetBSD only supports it in 7.0 and -current
However I set my access point to 802.11g only. I'm not up to date with the state of FreeBSD's wireless networking stack, wpa_supplicant, etc, but last time I checked the ath driver supported the 'n' hardware like the AR9227, but not the 'n' data rates. I'm sure I tested it on an 'n' only access point and there were problems. I suggest doing some more research in that direction.
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