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




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Based on kernel version 4.7.2. Page generated on 2016-08-22 22:41 EST.

1	* MARVELL MMP DMA controller
2	
3	Marvell Peripheral DMA Controller
4	Used platforms: pxa688, pxa910, pxa3xx, etc
5	
6	Required properties:
7	- compatible: Should be "marvell,pdma-1.0"
8	- reg: Should contain DMA registers location and length.
9	- interrupts: Either contain all of the per-channel DMA interrupts
10			or one irq for pdma device
11	
12	Optional properties:
13	- #dma-channels: Number of DMA channels supported by the controller (defaults
14	  to 32 when not specified)
15	- #dma-requests: Number of DMA requestor lines supported by the controller
16	  (defaults to 32 when not specified)
17	
18	"marvell,pdma-1.0"
19	Used platforms: pxa25x, pxa27x, pxa3xx, pxa93x, pxa168, pxa910, pxa688.
20	
21	Examples:
22	
23	/*
24	 * Each channel has specific irq
25	 * ICU parse out irq channel from ICU register,
26	 * while DMA controller may not able to distinguish the irq channel
27	 * Using this method, interrupt-parent is required as demuxer
28	 * For example, pxa688 icu register 0x128, bit 0~15 is PDMA channel irq,
29	 * 18~21 is ADMA irq
30	 */
31	pdma: dma-controller@d4000000 {
32		      compatible = "marvell,pdma-1.0";
33		      reg = <0xd4000000 0x10000>;
34		      interrupts = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15>;
35		      interrupt-parent = <&intcmux32>;
36		      #dma-channels = <16>;
37	      };
38	
39	/*
40	 * One irq for all channels
41	 * Dmaengine driver (DMA controller) distinguish irq channel via
42	 * parsing internal register
43	 */
44	pdma: dma-controller@d4000000 {
45		      compatible = "marvell,pdma-1.0";
46		      reg = <0xd4000000 0x10000>;
47		      interrupts = <47>;
48		      #dma-channels = <16>;
49	      };
50	
51	
52	Marvell Two Channel DMA Controller used specifically for audio
53	Used platforms: pxa688, pxa910
54	
55	Required properties:
56	- compatible: Should be "marvell,adma-1.0" or "marvell,pxa910-squ"
57	- reg: Should contain DMA registers location and length.
58	- interrupts: Either contain all of the per-channel DMA interrupts
59			or one irq for dma device
60	
61	"marvell,adma-1.0" used on pxa688
62	"marvell,pxa910-squ" used on pxa910
63	
64	Examples:
65	
66	/* each channel has specific irq */
67	adma0: dma-controller@d42a0800 {
68		      compatible = "marvell,adma-1.0";
69		      reg = <0xd42a0800 0x100>;
70		      interrupts = <18 19>;
71		      interrupt-parent = <&intcmux32>;
72	      };
73	
74	/* One irq for all channels */
75	squ: dma-controller@d42a0800 {
76		      compatible = "marvell,pxa910-squ";
77		      reg = <0xd42a0800 0x100>;
78		      interrupts = <46>;
79	      };
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