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dt-bindings: Update the documentation for the qcom,iommu-pagetable property

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Update the documentation for the qcom,iommu-pagetable property to
reflect that clients should not use the LLC or LLC_NWA configurations
when the IOMMU device they are upstream of is io-coherent.

Change-Id: I339ebaf0c2618f1bd57c4033b965ed02968b1434
This commit is contained in:
Isaac J. Manjarres
2021-12-17 15:20:33 -08:00
parent c36cf62a6f
commit f392a27cfa
1 changed files with 4 additions and 2 deletions
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6
bindings/iommu/arm,smmu.txt
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@@ -243,10 +243,12 @@ conditions.
--- "coherent"
Pagetables are io-coherent.
--- "LLC"
Pagetables may be saved in the system cache.
Pagetables may be saved in the system cache. Should not be used if
the IOMMU device is io-coherent.
--- "LLC_NWA"
Pagetables may be saved in the system cache is used, and
write-allocate hint is disabled.
write-allocate hint is disabled. Should not be used if the IOMMU
device is io-coherent.
- qcom,iommu-earlymap:
Optional, Bool.