From patchwork Wed Apr 23 14:53:25 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srikanth Thokala X-Patchwork-Id: 4041981 X-Patchwork-Delegate: vinod.koul@intel.com Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 0F6F19F319 for ; Wed, 23 Apr 2014 14:55:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 22E6A201ED for ; Wed, 23 Apr 2014 14:55:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7021620211 for ; Wed, 23 Apr 2014 14:55:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753332AbaDWOxk (ORCPT ); Wed, 23 Apr 2014 10:53:40 -0400 Received: from mail-qa0-f49.google.com ([209.85.216.49]:39047 "EHLO mail-qa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752113AbaDWOxg (ORCPT ); Wed, 23 Apr 2014 10:53:36 -0400 Received: by mail-qa0-f49.google.com with SMTP id j7so926888qaq.8 for ; Wed, 23 Apr 2014 07:53:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id; bh=DfcLwB/Sy0D9NrS97h1PBDYAcbiCCK4R8ukELFRO1EA=; b=slgpiiUZGFnlf3BxJp87sy5EX8C11jq6sFMm6e7Jlkzc9JumEs3yp/ycdooyGWHBiG EjIqKTWqyCDNnPgnjPDHbwnAJDeCxSP6cTVOJmJ71UJtOrZMbCw8TiOJ0mlN7WMUNBrS XRPrCfNCFI4FRwCQRrRSpUzY8QYv2sn9Sl+eI0ZGZlQFPvKZXJzriR1VBkAhr9kScv0n Wjp0t0+BixgkNxCUVdq8rIh81scVsD4dRtnmQL7OTihtIlTMapVdeYh+mf1emW41RUcE 4KmE428kIuz85R0j+JGX/k0JlNYbgkOe2ZVkJlVm3785iJwqWwp/2rZG8ruUyvBWZY0M UrFA== X-Received: by 10.140.47.18 with SMTP id l18mr61312352qga.9.1398264815566; Wed, 23 Apr 2014 07:53:35 -0700 (PDT) Received: from localhost ([149.199.62.254]) by mx.google.com with ESMTPSA id q2sm2097305qai.20.2014.04.23.07.53.32 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Wed, 23 Apr 2014 07:53:34 -0700 (PDT) From: Srikanth Thokala To: dan.j.williams@intel.com, vinod.koul@intel.com, michals@xilinx.com, grant.likely@linaro.org, robh+dt@kernel.org Cc: levex@linux.com, lars@metafoo.de, andriy.shevchenko@linux.intel.com, dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Srikanth Thokala Subject: [PATCH v8 1/2] dma: Add Xilinx Video DMA DT Binding Documentation Date: Wed, 23 Apr 2014 20:23:25 +0530 Message-Id: <1398264806-2082-1-git-send-email-sthokal@xilinx.com> X-Mailer: git-send-email 1.7.9.5 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,RP_MATCHES_RCVD,T_DKIM_INVALID,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 Device-tree binding documentation of Xilinx Video DMA Engine Signed-off-by: Srikanth Thokala Acked-by: Rob Herring --- Changes in v8: Fixed typos as suggested by Rob, Thanks. Changes in v7: None Changes in v6: None Changes in v5: None Changes in v4: None Changes in v3: None Changes in v2: - Removed device-id DT property, as suggested by Arnd Bergmann - Properly documented DT bindings as suggested by Arnd Bergmann --- .../devicetree/bindings/dma/xilinx/xilinx_vdma.txt | 75 ++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt new file mode 100644 index 0000000..264100c --- /dev/null +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt @@ -0,0 +1,75 @@ +Xilinx AXI VDMA engine, it does transfers between memory and video devices. +It can be configured to have one channel or two channels. If configured +as two channels, one is to transmit to the video device and another is +to receive from the video device. + +Required properties: +- compatible: Should be "xlnx,axi-vdma-1.00.a" +- #dma-cells: Should be <1>, see "dmas" property below +- reg: Should contain VDMA registers location and length. +- xlnx,num-fstores: Should be the number of framebuffers as configured in h/w. +- dma-channel child node: Should have at least one channel and can have up to + two channels per device. This node specifies the properties of each + DMA channel (see child node properties below). + +Optional properties: +- xlnx,include-sg: Tells configured for Scatter-mode in + the hardware. +- xlnx,flush-fsync: Tells which channel to Flush on Frame sync. + It takes following values: + {1}, flush both channels + {2}, flush mm2s channel + {3}, flush s2mm channel + +Required child node properties: +- compatible: It should be either "xlnx,axi-vdma-mm2s-channel" or + "xlnx,axi-vdma-s2mm-channel". +- interrupts: Should contain per channel VDMA interrupts. +- xlnx,data-width: Should contain the stream data width, take values + {32,64...1024}. + +Optional child node properties: +- xlnx,include-dre: Tells hardware is configured for Data + Realignment Engine. +- xlnx,genlock-mode: Tells Genlock synchronization is + enabled/disabled in hardware. + +Example: +++++++++ + +axi_vdma_0: axivdma@40030000 { + compatible = "xlnx,axi-vdma-1.00.a"; + #dma_cells = <1>; + reg = < 0x40030000 0x10000 >; + xlnx,num-fstores = <0x8>; + xlnx,flush-fsync = <0x1>; + dma-channel@40030000 { + compatible = "xlnx,axi-vdma-mm2s-channel"; + interrupts = < 0 54 4 >; + xlnx,datawidth = <0x40>; + } ; + dma-channel@40030030 { + compatible = "xlnx,axi-vdma-s2mm-channel"; + interrupts = < 0 53 4 >; + xlnx,datawidth = <0x40>; + } ; +} ; + + +* DMA client + +Required properties: +- dmas: a list of <[Video DMA device phandle] [Channel ID]> pairs, + where Channel ID is '0' for write/tx and '1' for read/rx + channel. +- dma-names: a list of DMA channel names, one per "dmas" entry + +Example: +++++++++ + +vdmatest_0: vdmatest@0 { + compatible ="xlnx,axi-vdma-test-1.00.a"; + dmas = <&axi_vdma_0 0 + &axi_vdma_0 1>; + dma-names = "vdma0", "vdma1"; +} ;