BTNXPUART_TX_STATE_ACTIVE
clear_bit(BTNXPUART_TX_STATE_ACTIVE, &nxpdev->tx_state);
set_bit(BTNXPUART_TX_STATE_ACTIVE, &nxpdev->tx_state);
if (test_bit(BTNXPUART_TX_STATE_ACTIVE, &nxpdev->tx_state)) {