From patchwork Tue Jan 26 04:12:38 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?WW9uZyBXdSAo5ZC05YuHKQ==?= X-Patchwork-Id: 8121031 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id E7C999F818 for ; Tue, 26 Jan 2016 12:17:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1FBA120274 for ; Tue, 26 Jan 2016 12:17:34 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 347E22026C for ; Tue, 26 Jan 2016 12:17:33 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aO2XV-0001L6-J7; Tue, 26 Jan 2016 12:16:05 +0000 Received: from [210.61.82.184] (helo=mailgw02.hq.mediatek.com) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aO2V6-0006bA-3M; Tue, 26 Jan 2016 12:13:42 +0000 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw02.hq.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1966026307; Tue, 26 Jan 2016 20:13:16 +0800 Received: from mhfsdcap03.localdomain (10.17.3.153) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Tue, 26 Jan 2016 20:13:15 +0800 From: Yong Wu To: Joerg Roedel , Thierry Reding , Mark Rutland , Matthias Brugger Subject: [PATCH v8 1/5] dt-bindings: iommu: Add binding for mediatek IOMMU Date: Tue, 26 Jan 2016 12:12:38 +0800 Message-ID: <1453781562-23556-2-git-send-email-yong.wu@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1453781562-23556-1-git-send-email-yong.wu@mediatek.com> References: <1453781562-23556-1-git-send-email-yong.wu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160126_041336_509617_BB1103BF X-CRM114-Status: GOOD ( 18.37 ) X-Spam-Score: 0.4 (/) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: p.zabel@pengutronix.de, devicetree@vger.kernel.org, pebolle@tiscali.nl, kendrick.hsu@mediatek.com, mitchelh@codeaurora.org, arnd@arndb.de, srv_heupstream@mediatek.com, Catalin Marinas , Will Deacon , linux-kernel@vger.kernel.org, Tomasz Figa , iommu@lists.linux-foundation.org, Rob Herring , Daniel Kurtz , Yong Wu , Sasha Hauer , linux-mediatek@lists.infradead.org, youhua.li@mediatek.com, Robin Murphy , linux-arm-kernel@lists.infradead.org, Lucas Stach Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00, DATE_IN_PAST_06_12, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch add mediatek iommu dts binding document. Signed-off-by: Yong Wu Acked-by: Rob Herring --- .../devicetree/bindings/iommu/mediatek,iommu.txt | 68 ++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 Documentation/devicetree/bindings/iommu/mediatek,iommu.txt diff --git a/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt b/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt new file mode 100644 index 0000000..cd1b1cd --- /dev/null +++ b/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt @@ -0,0 +1,68 @@ +* Mediatek IOMMU Architecture Implementation + + Some Mediatek SOCs contain a Multimedia Memory Management Unit (M4U) which +uses the ARM Short-Descriptor translation table format for address translation. + + About the M4U Hardware Block Diagram, please check below: + + EMI (External Memory Interface) + | + m4u (Multimedia Memory Management Unit) + | + SMI Common(Smart Multimedia Interface Common) + | + +----------------+------- + | | + | | + SMI larb0 SMI larb1 ... SoCs have several SMI local arbiter(larb). + (display) (vdec) + | | + | | + +-----+-----+ +----+----+ + | | | | | | + | | |... | | | ... There are different ports in each larb. + | | | | | | +OVL0 RDMA0 WDMA0 MC PP VLD + + As above, The Multimedia HW will go through SMI and M4U while it +access EMI. SMI is a bridge between m4u and the Multimedia HW. It contain +smi local arbiter and smi common. It will control whether the Multimedia +HW should go though the m4u for translation or bypass it and talk +directly with EMI. And also SMI help control the power domain and clocks for +each local arbiter. + Normally we specify a local arbiter(larb) for each multimedia HW +like display, video decode, and camera. And there are different ports +in each larb. Take a example, There are many ports like MC, PP, VLD in the +video decode local arbiter, all these ports are according to the video HW. + +Required properties: +- compatible : must be "mediatek,mt8173-m4u". +- reg : m4u register base and size. +- interrupts : the interrupt of m4u. +- clocks : must contain one entry for each clock-names. +- clock-names : must be "bclk", It is the block clock of m4u. +- mediatek,larbs : List of phandle to the local arbiters in the current Socs. + Refer to bindings/memory-controllers/mediatek,smi-larb.txt. It must sort + according to the local arbiter index, like larb0, larb1, larb2... +- iommu-cells : must be 1. This is the mtk_m4u_id according to the HW. + Specifies the mtk_m4u_id as defined in + dt-binding/memory/mt8173-larb-port.h. + +Example: + iommu: iommu@10205000 { + compatible = "mediatek,mt8173-m4u"; + reg = <0 0x10205000 0 0x1000>; + interrupts = ; + clocks = <&infracfg CLK_INFRA_M4U>; + clock-names = "bclk"; + mediatek,larbs = <&larb0 &larb1 &larb2 &larb3 &larb4 &larb5>; + #iommu-cells = <1>; + }; + +Example for a client device: + display { + compatible = "mediatek,mt8173-disp"; + iommus = <&iommu M4U_PORT_DISP_OVL0>, + <&iommu M4U_PORT_DISP_RDMA0>; + ... + };