linux-kernel - [PATCH v2 1/2] dma: Add Xilinx Central DMA DT Binding Documentation

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Message-Id: <1407238791-3370-1-git-send-email-sthokal@xilinx.com>
Date:	Tue,  5 Aug 2014 17:09:50 +0530
From:	Srikanth Thokala <sthokal@...inx.com>
To:	vinod.koul@...el.com, dan.j.williams@...el.com,
	michal.simek@...inx.com, grant.likely@...aro.org,
	robh+dt@...nel.org, levex@...ux.com, jassisinghbrar@...il.com
Cc:	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	anirudh@...inx.com, svemula@...inx.com,
	Srikanth Thokala <sthokal@...inx.com>
Subject: [PATCH v2 1/2] dma: Add Xilinx Central DMA DT Binding Documentation

Device-tree binding documentation of Xilinx Central DMA Engine

Signed-off-by: Srikanth Thokala <sthokal@...inx.com>
---
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@...00000 {
+	compatible = "xlnx,axi-cdma-1.00.a";
+	#dma_cells = <1>;
+	reg = < 0x7e200000 0x10000 >;
+	dma-channel@...00000 {
+		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

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