Documentation/devicetree/bindings/dma/sun6i-dma.txt

   1 Allwinner A31 DMA Controller
   2
   3 This driver follows the generic DMA bindings defined in dma.txt.
   4
   5 Required properties:
   6
   7 - compatible:   Must be one of
   8                   "allwinner,sun6i-a31-dma"
   9                   "allwinner,sun8i-a23-dma"
  10                   "allwinner,sun8i-h3-dma"
  11 - reg:          Should contain the registers base address and length
  12 - interrupts:   Should contain a reference to the interrupt used by this device
  13 - clocks:       Should contain a reference to the parent AHB clock
  14 - resets:       Should contain a reference to the reset controller asserting
  15                 this device in reset
  16 - #dma-cells :  Should be 1, a single cell holding a line request number
  17
  18 Example:
  19         dma: dma-controller@01c02000 {
  20                 compatible = "allwinner,sun6i-a31-dma";
  21                 reg = <0x01c02000 0x1000>;
  22                 interrupts = <0 50 4>;
  23                 clocks = <&ahb1_gates 6>;
  24                 resets = <&ahb1_rst 6>;
  25                 #dma-cells = <1>;
  26         };
  27
  28 Clients:
  29
  30 DMA clients connected to the A31 DMA controller must use the format
  31 described in the dma.txt file, using a two-cell specifier for each
  32 channel: a phandle plus one integer cells.
  33 The two cells in order are:
  34
  35 1. A phandle pointing to the DMA controller.
  36 2. The port ID as specified in the datasheet
  37
  38 Example:
  39 spi2: spi@01c6a000 {
  40         compatible = "allwinner,sun6i-a31-spi";
  41         reg = <0x01c6a000 0x1000>;
  42         interrupts = <0 67 4>;
  43         clocks = <&ahb1_gates 22>, <&spi2_clk>;
  44         clock-names = "ahb", "mod";
  45         dmas = <&dma 25>, <&dma 25>;
  46         dma-names = "rx", "tx";
  47         resets = <&ahb1_rst 22>;
  48 };