Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752629AbaG1MSQ (ORCPT ); Mon, 28 Jul 2014 08:18:16 -0400 Received: from mail-yk0-f169.google.com ([209.85.160.169]:58367 "EHLO mail-yk0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751598AbaG1MSM (ORCPT ); Mon, 28 Jul 2014 08:18:12 -0400 From: Srikanth Thokala To: vinod.koul@intel.com, dan.j.williams@intel.com, michal.simek@xilinx.com, grant.likely@linaro.org, robh+dt@kernel.org, levex@linux.com, jassisinghbrar@gmail.com Cc: linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, anirudh@xilinx.com, svemula@xilinx.com, Srikanth Thokala Subject: [PATCH v3 1/2] dma: Add Xilinx AXI DMA DT Binding Documentation Date: Mon, 28 Jul 2014 17:47:48 +0530 Message-Id: <1406549869-24422-1-git-send-email-sthokal@xilinx.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Device-tree binding documentation of Xilinx DMA Engine Signed-off-by: Srikanth Thokala --- Changes in v3: - Change property 'xlnx,data-width' to 'xlnx,datawidth' in the description to match the implementation. Changes in v2: None --- .../devicetree/bindings/dma/xilinx/xilinx_dma.txt | 65 ++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt new file mode 100644 index 0000000..18e8bcc --- /dev/null +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt @@ -0,0 +1,65 @@ +Xilinx AXI DMA engine, it does transfers between memory and AXI4 stream +target devices. It can be configured to have one channel or two channels. +If configured as two channels, one is to transmit to the device and another +is to receive from the device. + +Required properties: +- compatible: Should be "xlnx,axi-dma-1.00.a" +- #dma-cells: Should be <1>, see "dmas" property below +- reg: Should contain DMA registers location and length. +- dma-channel child node: Should have atleast one channel and can have upto + two channels per device. This node specifies the properties of each + DMA channel (see child node properties below). + +Optional properties: +- xlnx,include-sg: Tells whether configured for Scatter-mode in + the hardware. + +Required child node properties: +- compatible: It should be either "xlnx,axi-dma-mm2s-channel" or + "xlnx,axi-dma-s2mm-channel". +- interrupts: Should contain per channel DMA interrupts. +- xlnx,datawidth: Should contain the stream data width, take values + {32,64...1024}. + +Option child node properties: +- xlnx,include-dre: Tells whether hardware is configured for Data + Realignment Engine. + +Example: +++++++++ + +axi_dma_0: axidma@40400000 { + compatible = "xlnx,axi-dma-1.00.a"; + #dma_cells = <1>; + reg = < 0x40400000 0x10000 >; + dma-channel@40400000 { + compatible = "xlnx,axi-dma-mm2s-channel"; + interrupts = < 0 59 4 >; + xlnx,datawidth = <0x40>; + } ; + dma-channel@40400030 { + compatible = "xlnx,axi-dma-s2mm-channel"; + interrupts = < 0 58 4 >; + xlnx,datawidth = <0x40>; + } ; +} ; + + +* DMA client + +Required properties: +- dmas: a list of <[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: +++++++++ + +dmatest_0: dmatest@0 { + compatible ="xlnx,axi-dma-test-1.00.a"; + dmas = <&axi_dma_0 0 + &axi_dma_0 1>; + dma-names = "dma0", "dma1"; +} ; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/