Hi Lorenzo

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Does the presence of "iommu-map" tell you this is an SMMUv3?  Could

it

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have a different type of IOMMU?  I can't tell from reading
Documentation/devicetree/bindings/pci/pci-iommu.txt.

Only if the SMMUv3 driver is loaded and iommu-map binding property

present,

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the pcie devices will use SMMU translated iova for MSI doorbell

addresses.

And the iommu-map property _actually_ points at an OF node with an
SMMUv3 compatible string - the sheer fact that the SMMUv3 driver
is compiled in is not sufficient IIUC.

The blacklisted controller can only be present in an SoC that supports
SMMUv3 only.

From our view checking that SMMUv3 is compiled in and also checking that

the DT contains iommu-map is sufficient to decide to blacklist the controller.

Thanks
Gab 

Lorenzo

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