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

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Date:   Tue, 8 Jun 2021 09:37:03 +0200
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] dt-bindings: virtio: Convert virtio-mmio to DT schema

On Mon, Jun 07, 2021 at 02:39:28PM -0500, Rob Herring 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.

Sure, no problem. I can work on the conversion of virtio/iommu.txt as
well, so I'll learn a bit more about the yaml syntax.

Acked-by: Jean-Philippe Brucker <jean-philippe@...aro.org>

> 
>  .../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
> +
> +  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@...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>;
> +    };
> +
> +...
> -- 
> 2.27.0
>