[PATCH v9 4/4] PCI: hisi: blacklist hip06/hip07 controllers behind SMMUv3

[Gabriele Paoloni]

Hi Lorenzo

[...]

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

[...]