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

   1 * Actions Semi Owl SoCs DMA controller
   2
   3 This binding follows the generic DMA bindings defined in dma.txt.
   4
   5 Required properties:
   6 - compatible: Should be "actions,s900-dma".
   7 - reg: Should contain DMA registers location and length.
   8 - interrupts: Should contain 4 interrupts shared by all channel.
   9 - #dma-cells: Must be <1>. Used to represent the number of integer
  10               cells in the dmas property of client device.
  11 - dma-channels: Physical channels supported.
  12 - dma-requests: Number of DMA request signals supported by the controller.
  13                 Refer to Documentation/devicetree/bindings/dma/dma.txt
  14 - clocks: Phandle and Specifier of the clock feeding the DMA controller.
  15
  16 Example:
  17
  18 Controller:
  19                 dma: dma-controller@e0260000 {
  20                         compatible = "actions,s900-dma";
  21                         reg = <0x0 0xe0260000 0x0 0x1000>;
  22                         interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
  23                                      <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>,
  24                                      <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>,
  25                                      <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>;
  26                         #dma-cells = <1>;
  27                         dma-channels = <12>;
  28                         dma-requests = <46>;
  29                         clocks = <&clock CLK_DMAC>;
  30                 };
  31
  32 Client:
  33
  34 DMA clients connected to the Actions Semi Owl SoCs DMA controller must
  35 use the format described in the dma.txt file, using a two-cell specifier
  36 for each channel.
  37
  38 The two cells in order are:
  39 1. A phandle pointing to the DMA controller.
  40 2. The channel id.
  41
  42 uart5: serial@e012a000 {
  43         ...
  44         dma-names = "tx", "rx";
  45         dmas = <&dma 26>, <&dma 27>;
  46         ...
  47 };