ath9k_htc/docs/uart

   1 Name     | TX pin | TX GPIO | RX pin | RX GPIO | Baudrate
   2 ---------+--------+---------+--------+---------+--------
   3 AR9271   |   48   |  GPIO9  |   49   |  GPIO10 | 19200
   4 AR7010   |   54   |  GPIO8  |   52   |  GPIO9  | 115200