Re: [PATCH v4] devicetree: Add generic IOMMU device tree bindings

From: Will Deacon
Date: Wed Jul 09 2014 - 09:44:36 EST

On Fri, Jul 04, 2014 at 04:29:17PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
> 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:
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>

Acked-by: Will Deacon <will.deacon@xxxxxxx>

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?

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