On Sat, May 17, 2014 at 05:04:55PM +0900, Cho KyongHo wrote: > On Fri, 16 May 2014 14:23:18 +0200, Thierry Reding wrote: [...] > > +Examples: > > +========= > > + > > +Single-master IOMMU: > > +-------------------- > > + > > + iommu { > > + #iommu-cells = <0>; > > + }; > > + > > + master { > > + iommu = <&/iommu>; > > + }; > > + > > Great work, Thierry. > > One simple comment. > > This should be also applicable to multi-master IOMMUs that the masters > of an IOMMU is not configurable with ID or something. > I think the title needs to be changed to cover such IOMMUs which always > translate master's transactions and unable to change the configuration > of the relationship between the masters and IOMMUs by S/W. Agreed, how about we add a separate example for that case: Multiple-master IOMMU with fixed associations: ---------------------------------------------- /* multiple-master IOMMU */ iommu { /* * Masters are statically associated with this IOMMU and * address translation is always enabled. */ #iommu-cells = <0>; }; /* static association with IOMMU */ master@1 { reg = <1>; iommus = <&/iommu>; }; /* static association with IOMMU */ master@2 { reg = <2>; iommus = <&/iommu>; }; ? Thierry
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