FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/dma/apm-xgene-dma.txt

     Applied Micro X-Gene SoC DMA nodes
     
     DMA nodes are defined to describe on-chip DMA interfaces in
     APM X-Gene SoC.
     
     Required properties for DMA interfaces:
     - compatible: Should be "apm,xgene-dma".
     - device_type: set to "dma".
     - reg: Address and length of the register set for the device.
      It contains the information of registers in the following order:
      1st - DMA control and status register address space.
      2nd - Descriptor ring control and status register address space.
      3rd - Descriptor ring command register address space.
      4th - Soc efuse register address space.
    - interrupts: DMA has 5 interrupts sources. 1st interrupt is
      DMA error reporting interrupt. 2nd, 3rd, 4th and 5th interrupts
      are completion interrupts for each DMA channels.
    - clocks: Reference to the clock entry.
    
    Optional properties:
    - dma-coherent : Present if dma operations are coherent
    
    Example:
            dmaclk: dmaclk@1f27c000 {
                    compatible = "apm,xgene-device-clock";
                    #clock-cells = <1>;
                    clocks = <&socplldiv2 0>;
                    reg = <0x0 0x1f27c000 0x0 0x1000>;
                    reg-names = "csr-reg";
                    clock-output-names = "dmaclk";
            };
    
            dma: dma@1f270000 {
                            compatible = "apm,xgene-storm-dma";
                            device_type = "dma";
                            reg = <0x0 0x1f270000 0x0 0x10000>,
                                  <0x0 0x1f200000 0x0 0x10000>,
                                  <0x0 0x1b000000 0x0 0x400000>,
                                  <0x0 0x1054a000 0x0 0x100>;
                            interrupts = <0x0 0x82 0x4>,
                                         <0x0 0xb8 0x4>,
                                         <0x0 0xb9 0x4>,
                                         <0x0 0xba 0x4>,
                                         <0x0 0xbb 0x4>;
                            dma-coherent;
                            clocks = <&dmaclk 0>;
            };

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