Documentation/devicetree/bindings/dma/zxdma.txt

   1 * ZTE ZX296702 DMA controller
   2
   3 Required properties:
   4 - compatible: Should be "zte,zx296702-dma"
   5 - reg: Should contain DMA registers location and length.
   6 - interrupts: Should contain one interrupt shared by all channel
   7 - #dma-cells: see dma.txt, should be 1, para number
   8 - dma-channels: physical channels supported
   9 - dma-requests: virtual channels supported, each virtual channel
  10                 have specific request line
  11 - clocks: clock required
  12
  13 Example:
  14
  15 Controller:
  16         dma: dma-controller@09c00000{
  17                 compatible = "zte,zx296702-dma";
  18                 reg = <0x09c00000 0x1000>;
  19                 clocks = <&topclk ZX296702_DMA_ACLK>;
  20                 interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;
  21                 #dma-cells = <1>;
  22                 dma-channels = <24>;
  23                 dma-requests = <24>;
  24         };
  25
  26 Client:
  27 Use specific request line passing from dmax
  28 For example, spdif0 tx channel request line is 4
  29         spdif0: spdif0@b004000 {
  30                 #sound-dai-cells = <0>;
  31                 compatible = "zte,zx296702-spdif";
  32                 reg = <0x0b004000 0x1000>;
  33                 clocks = <&lsp0clk ZX296702_SPDIF0_DIV>;
  34                 clock-names = "tx";
  35                 interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
  36                 dmas = <&dma 4>;
  37                 dma-names = "tx";
  38         }