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| -rw-r--r-- | Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt b/Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt index 6611a7c2053a..01fdc33a41d0 100644 --- a/Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt +++ b/Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt @@ -9,6 +9,25 @@ blocks that can be used to create functional hardware objects/devices such as network interfaces, crypto accelerator instances, L2 switches, etc. +For an overview of the DPAA2 architecture and fsl-mc bus see: +Documentation/networking/dpaa2/overview.rst + +As described in the above overview, all DPAA2 objects in a DPRC share the +same hardware "isolation context" and a 10-bit value called an ICID +(isolation context id) is expressed by the hardware to identify +the requester. + +The generic 'iommus' property is insufficient to describe the relationship +between ICIDs and IOMMUs, so an iommu-map property is used to define +the set of possible ICIDs under a root DPRC and how they map to +an IOMMU. + +For generic IOMMU bindings, see +Documentation/devicetree/bindings/iommu/iommu.txt. + +For arm-smmu binding, see: +Documentation/devicetree/bindings/iommu/arm,smmu.txt. + Required properties: - compatible @@ -88,14 +107,34 @@ Sub-nodes: Value type: <phandle> Definition: Specifies the phandle to the PHY device node associated with the this dpmac. +Optional properties: + +- iommu-map: Maps an ICID to an IOMMU and associated iommu-specifier + data. + + The property is an arbitrary number of tuples of + (icid-base,iommu,iommu-base,length). + + Any ICID i in the interval [icid-base, icid-base + length) is + associated with the listed IOMMU, with the iommu-specifier + (i - icid-base + iommu-base). Example: + smmu: iommu@5000000 { + compatible = "arm,mmu-500"; + #iommu-cells = <1>; + stream-match-mask = <0x7C00>; + ... + }; + fsl_mc: fsl-mc@80c000000 { compatible = "fsl,qoriq-mc"; reg = <0x00000008 0x0c000000 0 0x40>, /* MC portal base */ <0x00000000 0x08340000 0 0x40000>; /* MC control reg */ msi-parent = <&its>; + /* define map for ICIDs 23-64 */ + iommu-map = <23 &smmu 23 41>; #address-cells = <3>; #size-cells = <1>; |