rimt_scan_node
node = rimt_scan_node(ACPI_RIMT_NODE_TYPE_IOMMU, dev);
node = rimt_scan_node(ACPI_RIMT_NODE_TYPE_PCIE_ROOT_COMPLEX, &bus->dev);
node = rimt_scan_node(ACPI_RIMT_NODE_TYPE_PLAT_DEVICE, dev);