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-Xilinx AXI VDMA engine, it does transfers between memory and video devices.
-It can be configured to have one channel or two channels. If configured
-as two channels, one is to transmit to the video device and another is
-to receive from the video device.
-
-Xilinx AXI DMA engine, it does transfers between memory and AXI4 stream
-target devices. It can be configured to have one channel or two channels.
-If configured as two channels, one is to transmit to the device and another
-is to receive from the device.
-
-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-vdma-1.00.a" or "xlnx,axi-dma-1.00.a" or
- "xlnx,axi-cdma-1.00.a""
-- #dma-cells: Should be <1>, see "dmas" property below
-- reg: Should contain VDMA registers location and length.
-- xlnx,addrwidth: Should be the vdma addressing size in bits(ex: 32 bits).
-- dma-ranges: Should be as the following <dma_addr cpu_addr max_len>.
-- dma-channel child node: Should have at least one channel and can have up to
- two channels per device. This node specifies the properties of each
- DMA channel (see child node properties below).
-- clocks: Input clock specifier. Refer to common clock bindings.
-- clock-names: List of input clocks
- For VDMA:
- Required elements: "s_axi_lite_aclk"
- Optional elements: "m_axi_mm2s_aclk" "m_axi_s2mm_aclk",
- "m_axis_mm2s_aclk", "s_axis_s2mm_aclk"
- For CDMA:
- Required elements: "s_axi_lite_aclk", "m_axi_aclk"
- FOR AXIDMA:
- Required elements: "s_axi_lite_aclk"
- Optional elements: "m_axi_mm2s_aclk", "m_axi_s2mm_aclk",
- "m_axi_sg_aclk"
-
-Required properties for VDMA:
-- xlnx,num-fstores: Should be the number of framebuffers as configured in h/w.
-
-Optional properties:
-- xlnx,include-sg: Tells configured for Scatter-mode in
- the hardware.
-Optional properties for VDMA:
-- xlnx,flush-fsync: Tells which channel to Flush on Frame sync.
- It takes following values:
- {1}, flush both channels
- {2}, flush mm2s channel
- {3}, flush s2mm channel
-
-Required child node properties:
-- compatible: It should be either "xlnx,axi-vdma-mm2s-channel" or
- "xlnx,axi-vdma-s2mm-channel".
-- interrupts: Should contain per channel VDMA interrupts.
-- xlnx,datawidth: Should contain the stream data width, take values
- {32,64...1024}.
-
-Optional child node properties:
-- xlnx,include-dre: Tells hardware is configured for Data
- Realignment Engine.
-Optional child node properties for VDMA:
-- xlnx,genlock-mode: Tells Genlock synchronization is
- enabled/disabled in hardware.
-
-Example:
-++++++++
-
-axi_vdma_0: axivdma@40030000 {
- compatible = "xlnx,axi-vdma-1.00.a";
- #dma_cells = <1>;
- reg = < 0x40030000 0x10000 >;
- dma-ranges = <0x00000000 0x00000000 0x40000000>;
- xlnx,num-fstores = <0x8>;
- xlnx,flush-fsync = <0x1>;
- xlnx,addrwidth = <0x20>;
- clocks = <&clk 0>, <&clk 1>, <&clk 2>, <&clk 3>, <&clk 4>;
- clock-names = "s_axi_lite_aclk", "m_axi_mm2s_aclk", "m_axi_s2mm_aclk",
- "m_axis_mm2s_aclk", "s_axis_s2mm_aclk";
- dma-channel@40030000 {
- compatible = "xlnx,axi-vdma-mm2s-channel";
- interrupts = < 0 54 4 >;
- xlnx,datawidth = <0x40>;
- } ;
- dma-channel@40030030 {
- compatible = "xlnx,axi-vdma-s2mm-channel";
- interrupts = < 0 53 4 >;
- xlnx,datawidth = <0x40>;
- } ;
-} ;
-
-
-* DMA client
-
-Required properties:
-- dmas: a list of <[Video 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:
-++++++++
-
-vdmatest_0: vdmatest@0 {
- compatible ="xlnx,axi-vdma-test-1.00.a";
- dmas = <&axi_vdma_0 0
- &axi_vdma_0 1>;
- dma-names = "vdma0", "vdma1";
-} ;