ath9k_hw_mac_to_clks
u32 val = ath9k_hw_mac_to_clks(ah, us - 2);
u32 val = ath9k_hw_mac_to_clks(ah, us);
u32 val = ath9k_hw_mac_to_clks(ah, us);
u32 val = ath9k_hw_mac_to_clks(ah, us);
REG_WRITE(ah, AR_D_GBL_IFS_EIFS, ath9k_hw_mac_to_clks(ah, eifs));