SC16IS7XX_IER_REG
sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val);
sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
sc16is7xx_port_update(&one->port, SC16IS7XX_IER_REG,