iommu/arm-smmu: Add global SMR masking property

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The current SMR masking support using a 2-cell iommu-specifier is
primarily intended to handle individual masters with large and/or
complex Stream ID assignments; it quickly gets a bit clunky in other SMR
use-cases where we just want to consistently mask out the same part of
every Stream ID (e.g. for MMU-500 configurations where the appended TBU
number gets in the way unnecessarily). Let's add a new property to allow
a single global mask value to better fit the latter situation.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Nipun Gupta <nipun.gupta@nxp.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Robin Murphy 2017-03-31 12:03:33 +01:00 • committed by Will Deacon

parent 8513c89300

commit 56fbf600dd

2 changed files with 31 additions and 1 deletions

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28

Documentation/devicetree/bindings/iommu/arm,smmu.txt

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4

drivers/iommu/arm-smmu.c

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