linux-kernel - Re: [PATCH v2 1/6] dt-bindings: iommu: Add Apple SART DMA address filter

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Date:   Mon, 25 Apr 2022 19:56:25 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sven Peter <sven@...npeter.dev>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-nvme@...ts.infradead.org, Christoph Hellwig <hch@....de>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Hector Martin <marcan@...can.st>,
        Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...com>,
        Keith Busch <kbusch@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 1/6] dt-bindings: iommu: Add Apple SART DMA address
 filter

On Fri, 15 Apr 2022 16:20:50 +0200, Sven Peter wrote:
> Apple SoCs such as the M1 come with a simple DMA address filter called
> SART. Unlike a real IOMMU no pagetables can be configured but instead
> DMA transactions can be allowed for up to 16 paddr regions. The consumer
> also needs special support since not all DMA allocations have to be
> added to this filter.
> 
> Signed-off-by: Sven Peter <sven@...npeter.dev>
> ---
> v1 -> v2:
>   - Moved to bindings/iommu since it is "Close enough to an IOMMU in
>     terms of its purpose" (Rob Herring)
> 
>  .../devicetree/bindings/iommu/apple,sart.yaml | 52 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  2 files changed, 53 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iommu/apple,sart.yaml
> 

Reviewed-by: Rob Herring <robh@...nel.org>