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Tue, 9 Jun 2015 14:20:43 +0530 (IST) From: Kedareswara rao Appana To: , , , , , , , , Subject: [PATCH v5 1/2] dma: Add Xilinx Central DMA DT Binding Documentation Date: Tue, 9 Jun 2015 14:20:42 +0530 Message-ID: <1433839842-5699-1-git-send-email-appanad@xilinx.com> X-Mailer: git-send-email 2.1.2 X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: IMSS-7.1.0.1224-8.0.0.1202-21602.005 X-TM-AS-User-Approved-Sender: Yes;Yes X-EOPAttributedMessage: 0 X-Microsoft-Exchange-Diagnostics: 1; BN1AFFO11FD054; 1:jDuQcnTCU29osUx4q0Z4dIeIENAcHU4joAWuQHlnn/9fxV2p7fNS9kYDDtAfVW39QHBXgkGujXw8AgI3dN/mDaBl7kY1D2bB9QXUa50oBKOqtjSa+Rj0QcEYmXTb5yQtHSjPbcUIqJr/Uab72Uq/a5of//CC3CvShkbr7m8TpqafWhfOkWzL/z7qxEx5aup77DOb4YZtIsCu/4UE/KV/KWNK56TMCBBxOPQfItm8KrWhHdT7q7aEtuGCdc6IuyzyAUqXc2yfoFKmIvVs14X/5zABMAh6gx5KPm6jh885l34QbOe5cT4VbQ+unTEQ5Js/FdGKfwMcyLZ6aPE9w1TWAg== X-Forefront-Antispam-Report: CIP:149.199.60.100; CTRY:US; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(10009020)(6009001)(438002)(189002)(199003)(63266004)(42186005)(92566002)(7049001)(46102003)(19580405001)(6806004)(47776003)(45336002)(48376002)(50466002)(52956003)(36756003)(62966003)(46386002)(229853001)(33646002)(2201001)(50986999)(189998001)(86362001)(87936001)(77156002)(36386004)(50226001)(5001770100001)(19580395003)(103686003)(5001960100002)(107886002)(106466001)(107986001)(90966001)(4001450100001)(4001430100001); 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X-Spam-Score: -1.1 (-) Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Srikanth Thokala X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAD_ENC_HEADER,BAYES_00, RCVD_IN_DNSWL_MED, T_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 Device-tree binding documentation of Xilinx Central DMA Engine. Signed-off-by: Srikanth Thokala Signed-off-by: Kedareswara rao Appana --- Changes in v5: - None. Changes in v4: - None. Changes in v3: - Used proper alignment for all the properties. 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..d1637de --- /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 = "cdma"; +} ;