bindings/dma/ti-dma-crossbar.txt

1 Texas Instruments DMA Crossbar (DMA request router)
4 - compatible:	"ti,dra7-dma-crossbar" for DRA7xx DMA crossbar
5 		"ti,am335x-edma-crossbar" for AM335x and AM437x
6 - reg:		Memory map for accessing module
7 - #dma-cells:	Should be set to match with the DMA controller's dma-cells
8 		for ti,dra7-dma-crossbar and <3> for ti,am335x-edma-crossbar.
9 - dma-requests:	Number of DMA requests the crossbar can receive
10 - dma-masters:	phandle pointing to the DMA controller
12 The DMA controller node need to have the following poroperties:
13 - dma-requests:	Number of DMA requests the controller can handle
16 - ti,dma-safe-map: Safe routing value for unused request lines
17 - ti,reserved-dma-request-ranges: DMA request ranges which should not be used
18 		when mapping xbar input to DMA request, they are either
19 		allocated to be used by for example the DSP or they are used as
23 When requesting channel via ti,dra7-dma-crossbar, the DMA client must request
24 the DMA event number as crossbar ID (input to the DMA crossbar).
26 For ti,am335x-edma-crossbar: the meaning of parameters of dmas for clients:
27 dmas = <&edma_xbar 12 0 1>; where <12> is the DMA request number, <0> is the TC
29 When mux 0 is used the DMA channel can be requested directly from edma node.
33 /* DMA controller */
34 sdma: dma-controller@4a056000 {
35 	compatible = "ti,omap4430-sdma";
41 	#dma-cells = <1>;
42 	dma-channels = <32>;
43 	dma-requests = <127>;
46 /* DMA crossbar */
47 sdma_xbar: dma-router@4a002b78 {
48 	compatible = "ti,dra7-dma-crossbar";
50 	#dma-cells = <1>;
51 	dma-requests = <205>;
52 	ti,dma-safe-map = <0>;
53 	/* Protect the sDMA request ranges: 10-14 and 100-126 */
54 	ti,reserved-dma-request-ranges = <10 5>, <100 27>;
55 	dma-masters = <&sdma>;
58 /* DMA client */
60 	compatible = "ti,omap4-uart";
62 	interrupts-extended = <&gic GIC_SPI 67 IRQ_TYPE_LEVEL_HIGH>;
64 	clock-frequency = <48000000>;
67 	dma-names = "tx", "rx";