Hi Jean, On 6/10/19 8:47 PM, Jean-Philippe Brucker wrote: > On Arm systems, some platform devices behind an SMMU may support the PASID > feature, which offers multiple address space. Let the firmware tell us > when a device supports PASID. > > Reviewed-by: Rob Herring <robh@xxxxxxxxxx> > Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx> > --- > Previous discussion on this patch last year: > https://patchwork.ozlabs.org/patch/872275/ > I split PASID and stall definitions, keeping only PASID here. > --- > Documentation/devicetree/bindings/iommu/iommu.txt | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/iommu/iommu.txt b/Documentation/devicetree/bindings/iommu/iommu.txt > index 5a8b4624defc..3c36334e4f94 100644 > --- a/Documentation/devicetree/bindings/iommu/iommu.txt > +++ b/Documentation/devicetree/bindings/iommu/iommu.txt > @@ -86,6 +86,12 @@ have a means to turn off translation. But it is invalid in such cases to > disable the IOMMU's device tree node in the first place because it would > prevent any driver from properly setting up the translations. > > +Optional properties: > +-------------------- > +- pasid-num-bits: Some masters support multiple address spaces for DMA, by > + tagging DMA transactions with an address space identifier. By default, > + this is 0, which means that the device only has one address space. > + Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx> Thanks Eric > > Notes: > ====== >
