Commit 13542a69 authored by Rob Herring's avatar Rob Herring
Browse files

dt-bindings: virtio: Convert virtio-mmio to DT schema 



Convert the virtio-mmio binding to DT schema format.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: virtualization@lists.linux-foundation.org
Acked-by: default avatarJean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210607193928.3092186-1-robh@kernel.org/
parent bb718cad

Documentation/devicetree/bindings/virtio/mmio.txt

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* virtio memory mapped device



See https://ozlabs.org/~rusty/virtio-spec/ for more details.



Required properties:



- compatible:	"virtio,mmio" compatibility string

- reg:		control registers base address and size including configuration space

- interrupts:	interrupt generated by the device



Required properties for virtio-iommu:



- #iommu-cells:	When the node corresponds to a virtio-iommu device, it is

		linked to DMA masters using the "iommus" or "iommu-map"

		properties [1][2]. #iommu-cells specifies the size of the

		"iommus" property. For virtio-iommu #iommu-cells must be

		1, each cell describing a single endpoint ID.



Optional properties:



- iommus:	If the device accesses memory through an IOMMU, it should

		have an "iommus" property [1]. Since virtio-iommu itself

		does not access memory through an IOMMU, the "virtio,mmio"

		node cannot have both an "#iommu-cells" and an "iommus"

		property.



Example:



	virtio_block@3000 {

		compatible = "virtio,mmio";

		reg = <0x3000 0x100>;

		interrupts = <41>;



		/* Device has endpoint ID 23 */

		iommus = <&viommu 23>

	}



	viommu: iommu@3100 {

		compatible = "virtio,mmio";

		reg = <0x3100 0x100>;

		interrupts = <42>;



		#iommu-cells = <1>

	}



[1] Documentation/devicetree/bindings/iommu/iommu.txt

[2] Documentation/devicetree/bindings/pci/pci-iommu.txt

Documentation/devicetree/bindings/virtio/mmio.yaml

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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/virtio/mmio.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#



title: virtio memory mapped devices



maintainers:

  - Jean-Philippe Brucker <jean-philippe@linaro.org>



description:

  See https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=virtio for

  more details.



properties:

  compatible:

    const: virtio,mmio



  reg:

    maxItems: 1



  interrupts:

    maxItems: 1



  '#iommu-cells':

    description: Required when the node corresponds to a virtio-iommu device.

    const: 1



  iommus:

    description: Required for devices making accesses thru an IOMMU.

    maxItems: 1



required:

  - compatible

  - reg

  - interrupts



additionalProperties: false



examples:

  - |

    virtio@3000 {

        compatible = "virtio,mmio";

        reg = <0x3000 0x100>;

        interrupts = <41>;



        /* Device has endpoint ID 23 */

        iommus = <&viommu 23>;

    };



    viommu: iommu@3100 {

        compatible = "virtio,mmio";

        reg = <0x3100 0x100>;

        interrupts = <42>;



        #iommu-cells = <1>;

    };



...