1* Synopsys Designware DMA Controller
2
3Required properties:
4- compatible: "snps,dma-spear1340"
5- reg: Address range of the DMAC registers
6- interrupt: Should contain the DMAC interrupt number
7- dma-channels: Number of channels supported by hardware
8- dma-requests: Number of DMA request lines supported, up to 16
9- dma-masters: Number of AHB masters supported by the controller
10- #dma-cells: must be <3>
11- chan_allocation_order: order of allocation of channel, 0 (default): ascending,
12  1: descending
13- chan_priority: priority of channels. 0 (default): increase from chan 0->n, 1:
14  increase from chan n->0
15- block_size: Maximum block size supported by the controller
16- data_width: Maximum data width supported by hardware per AHB master
17  (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
18
19
20Optional properties:
21- interrupt-parent: Should be the phandle for the interrupt controller
22  that services interrupts for this device
23- is_private: The device channels should be marked as private and not for by the
24  general purpose DMA channel allocator. False if not passed.
25
26Example:
27
28	dmahost: dma@fc000000 {
29		compatible = "snps,dma-spear1340";
30		reg = <0xfc000000 0x1000>;
31		interrupt-parent = <&vic1>;
32		interrupts = <12>;
33
34		dma-channels = <8>;
35		dma-requests = <16>;
36		dma-masters = <2>;
37		#dma-cells = <3>;
38		chan_allocation_order = <1>;
39		chan_priority = <1>;
40		block_size = <0xfff>;
41		data_width = <3 3>;
42	};
43
44DMA clients connected to the Designware DMA controller must use the format
45described in the dma.txt file, using a four-cell specifier for each channel.
46The four cells in order are:
47
481. A phandle pointing to the DMA controller
492. The DMA request line number
503. Source master for transfers on allocated channel
514. Destination master for transfers on allocated channel
52
53Example:
54	
55	serial@e0000000 {
56		compatible = "arm,pl011", "arm,primecell";
57		reg = <0xe0000000 0x1000>;
58		interrupts = <0 35 0x4>;
59		status = "disabled";
60		dmas = <&dmahost 12 0 1>,
61			<&dmahost 13 0 1 0>;
62		dma-names = "rx", "rx";
63	};
64