linux-kernel - Re: [PATCH 1/9] dt-bindings: soc: apple: Add Apple SART

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Message-Id: <076879ce-242e-4c24-9052-003de63d3f63@www.fastmail.com>
Date:   Sat, 02 Apr 2022 14:58:01 +0200
From:   "Sven Peter" <sven@...npeter.dev>
To:     "Rob Herring" <robh@...nel.org>
Cc:     "Hector Martin" <marcan@...can.st>,
        "Alyssa Rosenzweig" <alyssa@...enzweig.io>,
        "Arnd Bergmann" <arnd@...db.de>, "Keith Busch" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "Marc Zyngier" <maz@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH 1/9] dt-bindings: soc: apple: Add Apple SART

On Thu, Mar 31, 2022, at 23:23, Rob Herring wrote:
> On Mon, Mar 21, 2022 at 05:50:41PM +0100, 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.
>> 
>> Signed-off-by: Sven Peter <sven@...npeter.dev>
>> ---
>>  .../bindings/soc/apple/apple,sart.yaml        | 52 +++++++++++++++++++
>
> Close enough to an IOMMU in terms of its purpose, so put in 
> bindings/iommu/

Ok, will put it there. I guess I can also use iommu for the node name
then, e.g.

    iommu@...50000 {
      compatible = "apple,t8103-sart";
      reg = <0x7bc50000 0x4000>;
    };


Thanks,


Sven