Re: [Xen-devel] [PATCH V6 7/8] iommu/arm: Introduce iommu_add_dt_device API

[Jan Beulich <jbeulich@suse.com>]

On 26.09.2019 14:52, Julien Grall wrote:
> On 9/26/19 12:20 PM, Oleksandr Tyshchenko wrote:
>> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
>>
>> The main puprose of this patch is to add a way to register DT device
>> (which is behind the IOMMU) using the generic IOMMU DT bindings [1]
>> before assigning that device to a domain.
>>
>> So, this patch adds new "iommu_add_dt_device" API for adding DT device
>> to the IOMMU using generic IOMMU DT bindings and previously added
>> "iommu_fwspec" support. As devices can be assigned to the hardware domain
>> and other domains this function is called from two places: handle_device()
>> and iommu_do_dt_domctl().
>>
>> Besides that, this patch adds new "dt_xlate" callback (borrowed from
>> Linux "of_xlate") for providing the driver with DT IOMMU specifier
>> which describes the IOMMU master interfaces of that device (device IDs, etc).
>> According to the generic IOMMU DT bindings the context of required
>> properties for IOMMU device/master node (#iommu-cells, iommus) depends
>> on many factors and is really driver depended thing.
>>
>> Please note, all IOMMU drivers which support generic IOMMU DT bindings
>> should use "dt_xlate" and "add_device" callbacks.
>>
>> [1] https://www.kernel.org/doc/Documentation/devicetree/bindings/iommu/iommu.txt
>>
>> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
> 
> Acked-by: Julien Grall <julien.grall@arm.com>

Acked-by: Jan Beulich <jbeulich@suse.com>

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