Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt

   1 Texas Instruments DMA Crossbar (DMA request router)
   2
   3 Required properties:
   4 - compatible:   "ti,dra7-dma-crossbar" for DRA7xx DMA crossbar
   5 - reg:          Memory map for accessing module
   6 - #dma-cells:   Should be set to <1>.
   7                 Clients should use the crossbar request number (input)
   8 - dma-requests: Number of DMA requests the crossbar can receive
   9 - dma-masters:  phandle pointing to the DMA controller
  10
  11 The DMA controller node need to have the following poroperties:
  12 - dma-requests: Number of DMA requests the controller can handle
  13
  14 Optional properties:
  15 - ti,dma-safe-map: Safe routing value for unused request lines
  16
  17 Example:
  18
  19 /* DMA controller */
  20 sdma: dma-controller@4a056000 {
  21         compatible = "ti,omap4430-sdma";
  22         reg = <0x4a056000 0x1000>;
  23         interrupts =    <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
  24                         <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
  25                         <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>,
  26                         <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>;
  27         #dma-cells = <1>;
  28         dma-channels = <32>;
  29         dma-requests = <127>;
  30 };
  31
  32 /* DMA crossbar */
  33 sdma_xbar: dma-router@4a002b78 {
  34         compatible = "ti,dra7-dma-crossbar";
  35         reg = <0x4a002b78 0xfc>;
  36         #dma-cells = <1>;
  37         dma-requests = <205>;
  38         ti,dma-safe-map = <0>;
  39         dma-masters = <&sdma>;
  40 };
  41
  42 /* DMA client */
  43 uart1: serial@4806a000 {
  44         compatible = "ti,omap4-uart";
  45         reg = <0x4806a000 0x100>;
  46         interrupts-extended = <&gic GIC_SPI 67 IRQ_TYPE_LEVEL_HIGH>;
  47         ti,hwmods = "uart1";
  48         clock-frequency = <48000000>;
  49         status = "disabled";
  50         dmas = <&sdma_xbar 49>, <&sdma_xbar 50>;
  51         dma-names = "tx", "rx";
  52 };