SERIAL_MODE_OUTPUT_TRIGGERED
clear_bit(SERIAL_MODE_OUTPUT_TRIGGERED, &drvdata->filemode);
set_bit(SERIAL_MODE_OUTPUT_TRIGGERED, &drvdata->filemode);
clear_bit(SERIAL_MODE_OUTPUT_TRIGGERED, &drvdata->filemode);
uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;