SC16IS7XX_IOCONTROL_7_4
if (iocontrol & SC16IS7XX_IOCONTROL_7_4)
bank_mask = SC16IS7XX_IOCONTROL_7_4;
iocontrol_reg |= SC16IS7XX_IOCONTROL_7_4 | SC16IS7XX_IOCONTROL_3_0;
iocontrol_reg |= SC16IS7XX_IOCONTROL_7_4; /* No strictly correct