From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F354CC47404 for ; Fri, 11 Oct 2019 09:25:01 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BC5C02196E for ; Fri, 11 Oct 2019 09:25:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BC5C02196E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 70BB113EC; Fri, 11 Oct 2019 09:25:01 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id CF90513E1 for ; Fri, 11 Oct 2019 09:16:45 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id B39245D3 for ; Fri, 11 Oct 2019 09:16:44 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2597A337; Fri, 11 Oct 2019 02:16:44 -0700 (PDT) Received: from [192.168.1.123] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6239F3F703; Fri, 11 Oct 2019 02:16:42 -0700 (PDT) Subject: Re: [PATCH 0/2] iommu/arm-smmu: Add an optional "input-address-size" property To: Nicolin Chen , joro@8bytes.org, robh+dt@kernel.org, mark.rutland@arm.com, will@kernel.org References: <20191011034609.13319-1-nicoleotsuka@gmail.com> From: Robin Murphy Message-ID: Date: Fri, 11 Oct 2019 10:16:28 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191011034609.13319-1-nicoleotsuka@gmail.com> Content-Language: en-GB Cc: devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org 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/ Robin. > > Nicolin Chen (2): > dt-bindings: arm-smmu: Add an optional "input-address-size" property > iommu/arm-smmu: Read optional "input-address-size" property > > Documentation/devicetree/bindings/iommu/arm,smmu.txt | 7 +++++++ > drivers/iommu/arm-smmu.c | 10 ++++++++-- > 2 files changed, 15 insertions(+), 2 deletions(-) > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu