Documentation/devicetree/bindings/dma/apm-xgene-dma.txt

   1 Applied Micro X-Gene SoC DMA nodes
   2
   3 DMA nodes are defined to describe on-chip DMA interfaces in
   4 APM X-Gene SoC.
   5
   6 Required properties for DMA interfaces:
   7 - compatible: Should be "apm,xgene-dma".
   8 - device_type: set to "dma".
   9 - reg: Address and length of the register set for the device.
  10   It contains the information of registers in the following order:
  11   1st - DMA control and status register address space.
  12   2nd - Descriptor ring control and status register address space.
  13   3rd - Descriptor ring command register address space.
  14   4th - Soc efuse register address space.
  15 - interrupts: DMA has 5 interrupts sources. 1st interrupt is
  16   DMA error reporting interrupt. 2nd, 3rd, 4th and 5th interrupts
  17   are completion interrupts for each DMA channels.
  18 - clocks: Reference to the clock entry.
  19
  20 Optional properties:
  21 - dma-coherent : Present if dma operations are coherent
  22
  23 Example:
  24         dmaclk: dmaclk@1f27c000 {
  25                 compatible = "apm,xgene-device-clock";
  26                 #clock-cells = <1>;
  27                 clocks = <&socplldiv2 0>;
  28                 reg = <0x0 0x1f27c000 0x0 0x1000>;
  29                 reg-names = "csr-reg";
  30                 clock-output-names = "dmaclk";
  31         };
  32
  33         dma: dma@1f270000 {
  34                         compatible = "apm,xgene-storm-dma";
  35                         device_type = "dma";
  36                         reg = <0x0 0x1f270000 0x0 0x10000>,
  37                               <0x0 0x1f200000 0x0 0x10000>,
  38                               <0x0 0x1b000000 0x0 0x400000>,
  39                               <0x0 0x1054a000 0x0 0x100>;
  40                         interrupts = <0x0 0x82 0x4>,
  41                                      <0x0 0xb8 0x4>,
  42                                      <0x0 0xb9 0x4>,
  43                                      <0x0 0xba 0x4>,
  44                                      <0x0 0xbb 0x4>;
  45                         dma-coherent;
  46                         clocks = <&dmaclk 0>;
  47         };