SC16IS7XX_EFCR_REG
sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
sc16is7xx_port_write(port, SC16IS7XX_EFCR_REG,
.max_register = SC16IS7XX_EFCR_REG,
sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, mask, efcr);