get_serdev_controller
ctrl_dev = get_serdev_controller("DELL0501", NULL, 0, "serial0");
ctrl_dev = get_serdev_controller("PNP0501", "1", 0, YT2_1380_FC_SERDEV_CTRL);
ctrl_dev = get_serdev_controller(info->ctrl.acpi.hid, info->ctrl.acpi.uid,