The hardware block diagram please check bindings/iommu/mediatek,iommu.txt
Required properties:
-- compatible : must be "mediatek,mt8173-smi-larb"
+- compatible : must be one of :
+ "mediatek,mt8173-smi-larb"
+ "mediatek,mt2701-smi-larb"
- reg : the register and size of this local arbiter.
- mediatek,smi : a phandle to the smi_common node.
- power-domains : a phandle to the power domain of this local arbiter.