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[216.228.112.22]) by smtp.gmail.com with ESMTPSA id g12sm16155270pfb.97.2019.10.11.16.55.57 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 11 Oct 2019 16:55:58 -0700 (PDT) Date: Fri, 11 Oct 2019 16:55:25 -0700 From: Nicolin Chen To: Robin Murphy Subject: Re: [PATCH 0/2] iommu/arm-smmu: Add an optional "input-address-size" property Message-ID: <20191011235524.GA20683@Asurada-Nvidia.nvidia.com> References: <20191011034609.13319-1-nicoleotsuka@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, will@kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org 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! _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu