SC16IS7XX_IODIR_REG
val = sc16is7xx_port_read(port, SC16IS7XX_IODIR_REG);
sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset), 0);
sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset),