Messages in this thread | | | Date | Wed, 9 Jul 2014 14:40:50 +0100 | From | Will Deacon <> | Subject | Re: [PATCH v4] devicetree: Add generic IOMMU device tree bindings |
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On Fri, Jul 04, 2014 at 04:29:17PM +0100, Thierry Reding wrote: > From: Thierry Reding <treding@nvidia.com> > > This commit introduces a generic device tree binding for IOMMU devices. > Only a very minimal subset is described here, but it is enough to cover > the requirements of both the Exynos System MMU and Tegra SMMU as > discussed here: > > https://lkml.org/lkml/2014/4/27/346 > > Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Will Deacon <will.deacon@arm.com>
I would like to move the ARM SMMU driver over to this for 3.18, if possible. One use-case there is the ability to describe groups of masters behind a multi-master IOMMU but which must be part of the same domain (i.e. an iommu_group). This is useful for presenting devices to a guest with a virtual SMMU, where the physical devices share a stage-2 context.
With your binding, does this simply mean determining the set of master IDs in the group, then describing the complete set for each master?
Will
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