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-* virtio IOMMU PCI device
-
-When virtio-iommu uses the PCI transport, its programming interface is
-discovered dynamically by the PCI probing infrastructure. However the
-device tree statically describes the relation between IOMMU and DMA
-masters. Therefore, the PCI root complex that hosts the virtio-iommu
-contains a child node representing the IOMMU device explicitly.
-
-Required properties:
-
-- compatible: Should be "virtio,pci-iommu"
-- reg: PCI address of the IOMMU. As defined in the PCI Bus
- Binding reference [1], the reg property is a five-cell
- address encoded as (phys.hi phys.mid phys.lo size.hi
- size.lo). phys.hi should contain the device's BDF as
- 0b00000000 bbbbbbbb dddddfff 00000000. The other cells
- should be zero.
-- #iommu-cells: Each platform DMA master managed by the IOMMU is assigned
- an endpoint ID, described by the "iommus" property [2].
- For virtio-iommu, #iommu-cells must be 1.
-
-Notes:
-
-- DMA from the IOMMU device isn't managed by another IOMMU. Therefore the
- virtio-iommu node doesn't have an "iommus" property, and is omitted from
- the iommu-map property of the root complex.
-
-Example:
-
-pcie@10000000 {
- compatible = "pci-host-ecam-generic";
- ...
-
- /* The IOMMU programming interface uses slot 00:01.0 */
- iommu0: iommu@0008 {
- compatible = "virtio,pci-iommu";
- reg = <0x00000800 0 0 0 0>;
- #iommu-cells = <1>;
- };
-
- /*
- * The IOMMU manages all functions in this PCI domain except
- * itself. Omit BDF 00:01.0.
- */
- iommu-map = <0x0 &iommu0 0x0 0x8>
- <0x9 &iommu0 0x9 0xfff7>;
-};
-
-pcie@20000000 {
- compatible = "pci-host-ecam-generic";
- ...
- /*
- * The IOMMU also manages all functions from this domain,
- * with endpoint IDs 0x10000 - 0x1ffff
- */
- iommu-map = <0x0 &iommu0 0x10000 0x10000>;
-};
-
-ethernet@fe001000 {
- ...
- /* The IOMMU manages this platform device with endpoint ID 0x20000 */
- iommus = <&iommu0 0x20000>;
-};
-
-[1] Documentation/devicetree/bindings/pci/pci.txt
-[2] Documentation/devicetree/bindings/iommu/iommu.txt