1* Ingenic JZ4780 DMA Controller
2
3Required properties:
4
5- compatible: Should be one of:
6  * ingenic,jz4740-dma
7  * ingenic,jz4725b-dma
8  * ingenic,jz4770-dma
9  * ingenic,jz4780-dma
10- reg: Should contain the DMA channel registers location and length, followed
11  by the DMA controller registers location and length.
12- interrupts: Should contain the interrupt specifier of the DMA controller.
13- clocks: Should contain a clock specifier for the JZ4780 PDMA clock.
14- #dma-cells: Must be <2>. Number of integer cells in the dmas property of
15  DMA clients (see below).
16
17Optional properties:
18
19- ingenic,reserved-channels: Bitmask of channels to reserve for devices that
20  need a specific channel. These channels will only be assigned when explicitly
21  requested by a client. The primary use for this is channels 0 and 1, which
22  can be configured to have special behaviour for NAND/BCH when using
23  programmable firmware.
24
25Example:
26
27dma: dma-controller@13420000 {
28	compatible = "ingenic,jz4780-dma";
29	reg = <0x13420000 0x400
30	       0x13421000 0x40>;
31
32	interrupt-parent = <&intc>;
33	interrupts = <10>;
34
35	clocks = <&cgu JZ4780_CLK_PDMA>;
36
37	#dma-cells = <2>;
38
39	ingenic,reserved-channels = <0x3>;
40};
41
42DMA clients must use the format described in dma.txt, giving a phandle to the
43DMA controller plus the following 2 integer cells:
44
451. Request type: The DMA request type for transfers to/from the device on
46   the allocated channel, as defined in the SoC documentation.
47
482. Channel: If set to 0xffffffff, any available channel will be allocated for
49   the client. Otherwise, the exact channel specified will be used. The channel
50   should be reserved on the DMA controller using the ingenic,reserved-channels
51   property.
52
53Example:
54
55uart0: serial@10030000 {
56	...
57	dmas = <&dma 0x14 0xffffffff
58		&dma 0x15 0xffffffff>;
59	dma-names = "tx", "rx";
60	...
61};
62