linux-kernel - Re: [PATCH v4 03/20] iommu/tegra: gart: Ignore devices without IOMMU phandle in DT

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Message-ID: <8b3ece56-fda6-4e74-f69f-1e68b138e973@gmail.com>
Date:   Mon, 24 Sep 2018 21:41:21 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 03/20] iommu/tegra: gart: Ignore devices without IOMMU
 phandle in DT

On 9/24/18 1:05 PM, Thierry Reding wrote:
> On Mon, Sep 24, 2018 at 03:41:36AM +0300, Dmitry Osipenko wrote:
>> GART can't handle all devices, hence ignore devices that aren't related
>> to GART. IOMMU phandle must be explicitly assign to devices in the device
>> tree.
> 
> I think technically the GART can indeed handle all devices since it is
> just a physical address region that can be used to remap other physical
> addresses. That's not to say that doing so would be a good idea. So the
> commit message here is slightly confusing, but other than that the idea
> is good, so:
> 
> Acked-by: Thierry Reding <treding@...dia.com>
> 

It shouldn't be able to serve something like SDHCI, though I haven't
tried to verify that.