On Sunday 14 September 2014, Varun Sethi wrote: > "master-id-bits" property added to the IOMMU device node. This property can > be used by the IOMMU driver to match relevan bits in the master id expressed > by a DMA master. > > This can be used to mask out certain bits that get added to the device master id > due to IOMMU topology. For example, in case of MMU-500 the TBUID gets appended to > the master id. This prevents sharing of a stream ID, amongst devices which are > connected to different TBUs. > > Signed-off-by: Varun Sethi <Varun.Sethi@xxxxxxxxxxxxx> This seems rather specific to MMU-500. I don't think that most IOMMUs would use the term 'master ID', 'stream ID' or even the general concept, and you don't expand the acronym 'TBU'. I've seen many IOMMUs and I don't even know what that means. Why do you think this is something that is needed to be known at the global level, rather than a property for some individual drivers? Arnd -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
