linux-kernel - Re: [PATCH 0/2] iommu/arm-smmu: Add an optional "input-address-size" property

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Message-ID: <20191011235524.GA20683@Asurada-Nvidia.nvidia.com>
Date:   Fri, 11 Oct 2019 16:55:25 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     joro@...tes.org, robh+dt@...nel.org, mark.rutland@....com,
        will@...nel.org, vdumpa@...dia.com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/2] iommu/arm-smmu: Add an optional "input-address-size"
 property

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:
> https://lore.kernel.org/linux-arm-kernel/20190930133510.GA1904140@ulmo/

Thanks for the reply and link!