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authorRobin Murphy <robin.murphy@arm.com>2016-09-12 19:13:43 +0300
committerWill Deacon <will.deacon@arm.com>2016-09-16 11:34:16 +0300
commitb9bc88118029d20f25f9e457a147de65ada00f7c (patch)
treec73b4c63dfa0880961625703f460d305b5c21647 /Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
parent57f98d2f61e191ef9d06863c9ce3f8621f3671ef (diff)
downloadlinux-b9bc88118029d20f25f9e457a147de65ada00f7c.tar.xz
Docs: dt: document ARM SMMUv3 generic binding usage
We're about to ratify our use of the generic binding, so document it. CC: Rob Herring <robh+dt@kernel.org> CC: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt')
-rw-r--r--Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt8
1 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
index 7b94c88cf2ee..be57550e14e4 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
@@ -27,6 +27,12 @@ the PCIe specification.
* "cmdq-sync" - CMD_SYNC complete
* "gerror" - Global Error activated
+- #iommu-cells : See the generic IOMMU binding described in
+ devicetree/bindings/pci/pci-iommu.txt
+ for details. For SMMUv3, must be 1, with each cell
+ describing a single stream ID. All possible stream
+ IDs which a device may emit must be described.
+
** SMMUv3 optional properties:
- dma-coherent : Present if DMA operations made by the SMMU (page
@@ -54,6 +60,6 @@ the PCIe specification.
<GIC_SPI 79 IRQ_TYPE_EDGE_RISING>;
interrupt-names = "eventq", "priq", "cmdq-sync", "gerror";
dma-coherent;
- #iommu-cells = <0>;
+ #iommu-cells = <1>;
msi-parent = <&its 0xff0000>;
};