kernel/Documentation/devicetree/bindings/dma/k3dma.txt

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