From a73e528ab1499505c29e14091b19cb041e20e038 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Wed, 27 May 2015 17:25:58 +0100 Subject: [PATCH] Documentation: dt-bindings: Add device-tree binding for ARM SMMUv3 IOMMU This patch adds device-tree bindings for ARM SMMUv3 IOMMU devices. Cc: Mark Rutland Signed-off-by: Will Deacon Signed-off-by: Joerg Roedel --- .../devicetree/bindings/iommu/arm,smmu-v3.txt | 37 +++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt new file mode 100644 index 000000000000..c03eec116872 --- /dev/null +++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt @@ -0,0 +1,37 @@ +* ARM SMMUv3 Architecture Implementation + +The SMMUv3 architecture is a significant deparature from previous +revisions, replacing the MMIO register interface with in-memory command +and event queues and adding support for the ATS and PRI components of +the PCIe specification. + +** SMMUv3 required properties: + +- compatible : Should include: + + * "arm,smmu-v3" for any SMMUv3 compliant + implementation. This entry should be last in the + compatible list. + +- reg : Base address and size of the SMMU. + +- interrupts : Non-secure interrupt list describing the wired + interrupt sources corresponding to entries in + interrupt-names. If no wired interrupts are + present then this property may be omitted. + +- interrupt-names : When the interrupts property is present, should + include the following: + * "eventq" - Event Queue not empty + * "priq" - PRI Queue not empty + * "cmdq-sync" - CMD_SYNC complete + * "gerror" - Global Error activated + +** SMMUv3 optional properties: + +- dma-coherent : Present if DMA operations made by the SMMU (page + table walks, stream table accesses etc) are cache + coherent with the CPU. + + NOTE: this only applies to the SMMU itself, not + masters connected upstream of the SMMU. -- 2.20.1