Device-tree binding documentation of Xilinx Central DMA Engine
Signed-off-by: Srikanth Thokala <sthokal@xxxxxxxxxx>
---
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
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