iommu_ops_from_fwnode
const struct iommu_ops *iommu_ops_from_fwnode(const struct fwnode_handle *fwnode);
return iommu_ops_from_fwnode(fwspec ? fwspec->iommu_fwnode : NULL);
ops = iommu_ops_from_fwnode(&iommu_spec->np->fwnode);