AR_PHY_XPA_CFG    570 drivers/net/wireless/ath/ath9k/ar9002_phy.h #define AR_PHY_XPA_CFG		0xA3D8
AR_PHY_XPA_CFG    488 drivers/net/wireless/ath/ath9k/ar9003_phy.h #define AR_PHY_XPA_CFG           (AR_SM_BASE + 0x158)