dt-bindings: virtio-mmio: Add IOMMU description

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The nature of a virtio-mmio node is discovered by the virtio driver at
probe time. However the DMA relation between devices must be described
statically. When a virtio-mmio node is a virtio-iommu device, it needs an
"#iommu-cells" property as specified by bindings/iommu/iommu.txt.

Otherwise, the virtio-mmio device may perform DMA through an IOMMU, which
requires an "iommus" property. Describe these requirements in the
device-tree bindings documentation.

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

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Jean-Philippe Brucker 2019-01-15 12:19:53 +00:00 • committed by Michael S. Tsirkin

parent 0b4a7092ff

commit 8447d84e35

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Documentation/devicetree/bindings/virtio/mmio.txt

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