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

[Oleksandr <olekstysh@xxxxxxxxx>]

On 26.09.19 15:52, Julien Grall wrote:
> Hi,
Hi Julien


> On 9/26/19 12:20 PM, Oleksandr Tyshchenko wrote:
> > From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> >
> > 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@xxxxxxxx>
> Acked-by: Julien Grall <julien.grall@xxxxxxx>
Thank you!

--
Regards,

Oleksandr Tyshchenko


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