dt-bindings: virtio: Replace HTTP links with HTTPS ones
[linux-2.6-block.git] / Documentation / devicetree / bindings / virtio / mmio.txt
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1* virtio memory mapped device
2
8f92f680 3See https://ozlabs.org/~rusty/virtio-spec/ for more details.
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4
5Required properties:
6
7- compatible: "virtio,mmio" compatibility string
8- reg: control registers base address and size including configuration space
9- interrupts: interrupt generated by the device
10
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11Required properties for virtio-iommu:
12
13- #iommu-cells: When the node corresponds to a virtio-iommu device, it is
14 linked to DMA masters using the "iommus" or "iommu-map"
15 properties [1][2]. #iommu-cells specifies the size of the
16 "iommus" property. For virtio-iommu #iommu-cells must be
17 1, each cell describing a single endpoint ID.
18
19Optional properties:
20
21- iommus: If the device accesses memory through an IOMMU, it should
22 have an "iommus" property [1]. Since virtio-iommu itself
23 does not access memory through an IOMMU, the "virtio,mmio"
24 node cannot have both an "#iommu-cells" and an "iommus"
25 property.
26
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27Example:
28
29 virtio_block@3000 {
30 compatible = "virtio,mmio";
31 reg = <0x3000 0x100>;
32 interrupts = <41>;
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33
34 /* Device has endpoint ID 23 */
35 iommus = <&viommu 23>
edfd52e6 36 }
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37
38 viommu: iommu@3100 {
39 compatible = "virtio,mmio";
40 reg = <0x3100 0x100>;
41 interrupts = <42>;
42
43 #iommu-cells = <1>
44 }
45
46[1] Documentation/devicetree/bindings/iommu/iommu.txt
47[2] Documentation/devicetree/bindings/pci/pci-iommu.txt