RTL_IICBUS_TIMEOUT
err = iicbus_start(iicbus, RTL8366_IIC_ADDR | RTL_IICBUS_READ, RTL_IICBUS_TIMEOUT);
err = iicbus_write(iicbus, bytes, 2, &xferd, RTL_IICBUS_TIMEOUT);
err = iicbus_start(iicbus, slave | op, RTL_IICBUS_TIMEOUT);
err = iicbus_write(iicbus, bytes, 2, &xferd, RTL_IICBUS_TIMEOUT);
err = iicbus_write(iicbus, bytes, 4, &xferd, RTL_IICBUS_TIMEOUT);