Date: Wed, 30 Jul 2014 12:04:25 +0100
From: Will Deacon <will.deacon@arm.com>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>, Pawel Moll <Pawel.Moll@arm.com>,
        Mark Rutland <Mark.Rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        Stephen Warren <swarren@wwwdotorg.org>, Arnd Bergmann <arnd@arndb.de>,
        Joerg Roedel <joro@8bytes.org>, Cho KyongHo <pullip.cho@samsung.com>,
        Grant Grundler <grundler@chromium.org>,
        Dave P Martin <Dave.Martin@arm.com>,
        Marc Zyngier <Marc.Zyngier@arm.com>, Hiroshi Doyu <hdoyu@nvidia.com>,
        Olav Haugan <ohaugan@codeaurora.org>,
        Varun Sethi <varun.sethi@freescale.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
        "linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        arm@kernel.org
Subject: Re: [PATCH v4] devicetree: Add generic IOMMU device tree bindings
Message-ID: <20140730110425.GI12239@arm.com>
References: <1404487757-18829-1-git-send-email-thierry.reding@gmail.com>
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Hi all,

On Fri, Jul 04, 2014 at 04:29:17PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> This commit introduces a generic device tree binding for IOMMU devices.
> Only a very minimal subset is described here, but it is enough to cover
> the requirements of both the Exynos System MMU and Tegra SMMU as
> discussed here:
> 
>     https://lkml.org/lkml/2014/4/27/346
> 
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
> Changes in v4:
> - clarify that disabling an IOMMU DT node may not disable translation
> - be more explicit that examples are only examples
> - add multi-ID master example
> 
> Changes in v3:
> - use #iommu-cells instead of #address-cells/#size-cells
> - drop optional iommu-names property
> 
> Changes in v2:
> - add notes about "dma-ranges" property (drop note from commit message)
> - document priorities of "iommus" property vs. "dma-ranges" property
> - drop #iommu-cells in favour of #address-cells and #size-cells
> - remove multiple-master device example
> 
>  Documentation/devicetree/bindings/iommu/iommu.txt | 172 ++++++++++++++++++++++
>  1 file changed, 172 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iommu/iommu.txt

I'm concerned that this patch hasn't been picked up for 3.17 (I can't see it
in -next). If we want to move the ARM SMMU driver over to this new binding,
we can't keep dragging our feet for much longer as I *really* don't plan to
support two bindings in parallel (one is complicated enough already).

Any chance we can see this merged, please?

Will
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