FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/dma/snps,dw-axi-dmac.txt

     Synopsys DesignWare AXI DMA Controller
     
     Required properties:
     - compatible: "snps,axi-dma-1.01a"
     - reg: Address range of the DMAC registers. This should include
       all of the per-channel registers.
     - interrupt: Should contain the DMAC interrupt number.
     - dma-channels: Number of channels supported by hardware.
     - snps,dma-masters: Number of AXI masters supported by the hardware.
    - snps,data-width: Maximum AXI data width supported by hardware.
      (0 - 8bits, 1 - 16bits, 2 - 32bits, ..., 6 - 512bits)
    - snps,priority: Priority of channel. Array size is equal to the number of
      dma-channels. Priority value must be programmed within [0:dma-channels-1]
      range. (0 - minimum priority)
    - snps,block-size: Maximum block size supported by the controller channel.
      Array size is equal to the number of dma-channels.
    
    Optional properties:
    - snps,axi-max-burst-len: Restrict master AXI burst length by value specified
      in this property. If this property is missing the maximum AXI burst length
      supported by DMAC is used. [1:256]
    
    Example:
    
    dmac: dma-controller@80000 {
            compatible = "snps,axi-dma-1.01a";
            reg = <0x80000 0x400>;
            clocks = <&core_clk>, <&cfgr_clk>;
            clock-names = "core-clk", "cfgr-clk";
            interrupt-parent = <&intc>;
            interrupts = <27>;
    
            dma-channels = <4>;
            snps,dma-masters = <2>;
            snps,data-width = <3>;
            snps,block-size = <4096 4096 4096 4096>;
            snps,priority = <0 1 2 3>;
            snps,axi-max-burst-len = <16>;
    };

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