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dt-bindings: Document the "qcom,split-tables" IOMMU binding

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Add documentation for the qcom,split-tables binding. The property
specifies that the associated hardware can support the split-table
model, where a domain's IOVA space is split into two symmetric
portions: an upper portion, and a lower portion.

Change-Id: I0613e99c6a7b7e2b8c39cd37cc6762013bf6055f
This commit is contained in:
Isaac J. Manjarres 2020-05-04 10:54:23 -07:00 • committed by Gerrit - the friendly Code Review server
commit 589c83405b
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7
bindings/iommu/arm,smmu.txt
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@ -128,6 +128,13 @@ conditions.
retention. No cache invalidation operations involving asid
may be used.
- qcom,split-tables:
Some hardware configurations can easily use a model where
the I/O virtual address space for a domain can be split into
two symmetric portions, and clients can manage each portion.
Set for hardware that supports this model, and requires
this feature.
- qcom,actlr:
An array of <sid mask actlr-setting>.
Any sid X for which X&~mask==sid will be programmed with the