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SubjectRe: [PATCH V3 5/8] dt-bindings: Add xen,grant-dma IOMMU description for xen-grant DMA ops
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On 31.05.22 14:52, Krzysztof Kozlowski wrote:

Hello Krzysztof

> On 30/05/2022 23:00, Oleksandr Tyshchenko wrote:
>> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
> Thank you for your patch. There is something to discuss/improve.
>
>> diff --git a/Documentation/devicetree/bindings/iommu/xen,grant-dma.yaml b/Documentation/devicetree/bindings/iommu/xen,grant-dma.yaml
>> new file mode 100644
>> index 00000000..ab5765c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iommu/xen,grant-dma.yaml
>> @@ -0,0 +1,49 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/iommu/xen,grant-dma.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Xen specific IOMMU for virtualized devices (e.g. virtio)
>> +
>> +maintainers:
>> + - Stefano Stabellini <sstabellini@kernel.org>
>> +
>> +description:
>> + The reference to Xen specific IOMMU node using "iommus" property indicates
>> + that Xen grant mappings need to be enabled for the device, and it specifies
>> + the ID of the domain where the corresponding backend resides.
>> + The binding is required to restrict memory access using Xen grant mappings.
>> +
>> +properties:
>> + compatible:
>> + const: xen,grant-dma
>> +
>> + '#iommu-cells':
>> + const: 1
>> + description:
>> + Xen specific IOMMU is multiple-master IOMMU device.
>> + The single cell describes the domid (domain ID) of the domain where
>> + the backend is running.
>> +
>> +required:
>> + - compatible
>> + - "#iommu-cells"
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> + - |
>> + xen_iommu {
> No underscores in node names, generic node names, so this looks like
> "iommu".


ok, will change


>
>> + compatible = "xen,grant-dma";
>> + #iommu-cells = <1>;
>> + };
>> +
>> + virtio@3000 {
>> + compatible = "virtio,mmio";
>> + reg = <0x3000 0x100>;
>> + interrupts = <41>;
>> +
>> + /* The backend is located in Xen domain with ID 1 */
>> + iommus = <&xen_iommu 1>;
> There is no need usually to give consumer examples in provider binding.
> If there is nothing specific here (looks exactly like every IOMMU
> consumer in Linux kernel), drop the consumer.


I got it.  There is nothing specific from the device tree's perspective,
I was thinking to draw attention to the IOMMU specifier (in our case,
the master device's ID == backend's domain ID). But  '#iommu-cells'
description above already clarifies that. Will drop.


>
>> + };
>
> Best regards,
> Krzysztof

--
Regards,

Oleksandr Tyshchenko

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