Documentation/devicetree/bindings/dma/k3dma.txt

   1 * Hisilicon K3 DMA controller
   2
   3 See dma.txt first
   4
   5 Required properties:
   6 - compatible: Must be one of
   7 -              "hisilicon,k3-dma-1.0"
   8 -              "hisilicon,hisi-pcm-asp-dma-1.0"
   9 - reg: Should contain DMA registers location and length.
  10 - interrupts: Should contain one interrupt shared by all channel
  11 - #dma-cells: see dma.txt, should be 1, para number
  12 - dma-channels: physical channels supported
  13 - dma-requests: virtual channels supported, each virtual channel
  14                 have specific request line
  15 - clocks: clock required
  16
  17 Example:
  18
  19 Controller:
  20                 dma0: dma@fcd02000 {
  21                         compatible = "hisilicon,k3-dma-1.0";
  22                         reg = <0xfcd02000 0x1000>;
  23                         #dma-cells = <1>;
  24                         dma-channels = <16>;
  25                         dma-requests = <27>;
  26                         interrupts = <0 12 4>;
  27                         clocks = <&pclk>;
  28                 };
  29
  30 Client:
  31 Use specific request line passing from dmax
  32 For example, i2c0 read channel request line is 18, while write channel use 19
  33
  34                 i2c0: i2c@fcb08000 {
  35                         compatible = "snps,designware-i2c";
  36                         dmas =  <&dma0 18          /* read channel */
  37                                  &dma0 19>;        /* write channel */
  38                         dma-names = "rx", "tx";
  39                 };
  40
  41                 i2c1: i2c@fcb09000 {
  42                         compatible = "snps,designware-i2c";
  43                         dmas =  <&dma0 20          /* read channel */
  44                                  &dma0 21>;        /* write channel */
  45                         dma-names = "rx", "tx";
  46                 };
  47