From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753435AbaHELkA (ORCPT ); Tue, 5 Aug 2014 07:40:00 -0400 Received: from mail-qg0-f46.google.com ([209.85.192.46]:61546 "EHLO mail-qg0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752850AbaHELj7 (ORCPT ); Tue, 5 Aug 2014 07:39:59 -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 v2 1/2] dma: Add Xilinx Central DMA DT Binding Documentation Date: Tue, 5 Aug 2014 17:09:50 +0530 Message-Id: <1407238791-3370-1-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 --- Changes in v2: - Change property 'xlnx,data-width' to 'xlnx,datawidth' in the description to match the implementation. --- .../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,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_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