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From: Nicolin Chen <>
To: Robin Murphy <>
Subject: Re: [PATCH 0/2] iommu/arm-smmu: Add an optional "input-address-size" property
Date: Fri, 11 Oct 2019 16:55:25 -0700
Message-ID: <> (raw)
In-Reply-To: <>

On Fri, Oct 11, 2019 at 10:16:28AM +0100, Robin Murphy wrote:
> On 2019-10-11 4:46 am, Nicolin Chen wrote:
> > This series of patches add an optional DT property to allow an SoC to
> > specify how many bits being physically connected to its SMMU instance,
> > depending on the SoC design.
> This has come up before, and it doesn't work in general because a single
> SMMU instance can have many master interfaces, with potentially different
> sizes of address bus wired up to each. It's also a conceptually-wrong
> approach anyway, since this isn't a property of the SMMU; it's a property of
> the interconnect(s) upstream of the SMMU.
> IIRC you were working on Tegra - if so, Thierry already has a plan, see this
> thread:

Thanks for the reply and link!
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Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-11  3:46 Nicolin Chen
2019-10-11  3:46 ` [PATCH 1/2] dt-bindings: arm-smmu: " Nicolin Chen
2019-10-11  3:46 ` [PATCH 2/2] iommu/arm-smmu: Read " Nicolin Chen
2019-10-11  9:16 ` [PATCH 0/2] iommu/arm-smmu: Add an " Robin Murphy
2019-10-11 23:55   ` Nicolin Chen [this message]

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