From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754516AbaCaNyU (ORCPT ); Mon, 31 Mar 2014 09:54:20 -0400 Received: from mail-ie0-f171.google.com ([209.85.223.171]:38050 "EHLO mail-ie0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753187AbaCaNyO (ORCPT ); Mon, 31 Mar 2014 09:54:14 -0400 From: Srikanth Thokala To: dan.j.williams@intel.com, vinod.koul@intel.com, michal.simek@xilinx.com, grant.likely@linaro.org, robh+dt@kernel.org Cc: lars@metafoo.de, andriy.shevchenko@linux.intel.com, jaswinder.singh@linaro.org, dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Srikanth Thokala Subject: [PATCH 1/2] dma: Add Xilinx Central DMA DT Binding Documentation Date: Mon, 31 Mar 2014 19:24:03 +0530 Message-Id: <1396274044-6524-1-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 Central DMA Engine Signed-off-by: Srikanth Thokala --- .../devicetree/bindings/dma/xilinx/xilinx_cdma.txt | 54 ++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt new file mode 100644 index 0000000..b04f76b --- /dev/null +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt @@ -0,0 +1,54 @@ +Xilinx AXI CDMA engine, it does transfers between memory-mapped source +address and a memory-mapped destination address. + +Required properties: +- compatible: Should be "xlnx,axi-cdma-1.00.a" +- #dma-cells: Should be <1>, see "dmas" property below +- reg: Should contain cdma registers location and length. +- dma-channel child node: Should have only one channel + +Optional properties: +- xlnx,include-sg: Tells whether configured for Scatter-mode in + the hardware. + +Required child node properties: +- compatible: It should be "xlnx,axi-cdma-channel". +- interrupts: Should contain per channel CDMA interrupts. +- xlnx,data-width: 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_cdma_0: axicdma@7e200000 { + compatible = "xlnx,axi-cdma-1.00.a"; + #dma_cells = <1>; + reg = < 0x7e200000 0x10000 >; + dma-channel@7e200000 { + compatible = "xlnx,axi-cdma-channel"; + interrupts = < 0 55 4 >; + xlnx,datawidth = <0x40>; + } ; +} ; + + +* DMA client + +Required properties: +- dmas: a list of <[Central 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: +++++++++ + +cdmatest_0: cdmatest@0 { + compatible ="xlnx,axi-cdma-test-1.00.a"; + dmas = <&axi_cdma_0 0>; + dma-names = "cdma0"; +} ; -- 1.7.9.5