Device-tree binding documentation of Xilinx Central DMA Engine. Signed-off-by: Kedareswara rao Appana <appa...@xilinx.com> --- Changes in v6: - None. 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..8b366ce --- /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"; +} ; -- 2.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/