linux-kernel - Re: [PATCH] dt-bindings: virtio: Convert virtio-mmio to DT schema

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Date:   Tue, 8 Jun 2021 19:55:51 -0500
From:   Rob Herring <robh@...nel.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jason Wang <jasowang@...hat.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH] dt-bindings: virtio: Convert virtio-mmio to DT schema

On Mon, Jun 7, 2021 at 2:39 PM Rob Herring <robh@...nel.org> wrote:
>
> Convert the virtio-mmio binding to DT schema format.
>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Cc: virtualization@...ts.linux-foundation.org
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> Jean-Philippe, hopefully you are okay with being listed as the
> maintainer here. You're the only active person that's touched this
> binding.
>
>  .../devicetree/bindings/virtio/mmio.txt       | 47 ---------------
>  .../devicetree/bindings/virtio/mmio.yaml      | 60 +++++++++++++++++++
>  2 files changed, 60 insertions(+), 47 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/virtio/mmio.txt
>  create mode 100644 Documentation/devicetree/bindings/virtio/mmio.yaml
>
> diff --git a/Documentation/devicetree/bindings/virtio/mmio.txt b/Documentation/devicetree/bindings/virtio/mmio.txt
> deleted file mode 100644
> index 0a575f329f6e..000000000000
> --- a/Documentation/devicetree/bindings/virtio/mmio.txt
> +++ /dev/null
> @@ -1,47 +0,0 @@
> -* 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@...0 {
> -               compatible = "virtio,mmio";
> -               reg = <0x3000 0x100>;
> -               interrupts = <41>;
> -
> -               /* Device has endpoint ID 23 */
> -               iommus = <&viommu 23>
> -       }
> -
> -       viommu: iommu@...0 {
> -               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
> diff --git a/Documentation/devicetree/bindings/virtio/mmio.yaml b/Documentation/devicetree/bindings/virtio/mmio.yaml
> new file mode 100644
> index 000000000000..444bfa24affc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/virtio/mmio.yaml
> @@ -0,0 +1,60 @@
> +# 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@...aro.org>
> +
> +description:
> +  See https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=virtio for
> +  more details.
> +
> +properties:
> +  compatible:
> +    const: virtio-mmio

This should be virtio,mmio.