1* ARM PrimeCell PL330 DMA Controller
2
3The ARM PrimeCell PL330 DMA controller can move blocks of memory contents
4between memory and peripherals or memory to memory.
5
6Required properties:
7  - compatible: should include both "arm,pl330" and "arm,primecell".
8  - reg: physical base address of the controller and length of memory mapped
9    region.
10  - interrupts: interrupt number to the cpu.
11
12Optional properties:
13  - dma-coherent      : Present if dma operations are coherent
14  - #dma-cells: must be <1>. used to represent the number of integer
15    cells in the dmas property of client device.
16  - dma-channels: contains the total number of DMA channels supported by the DMAC
17  - dma-requests: contains the total number of DMA requests supported by the DMAC
18
19Example:
20
21	pdma0: pdma@12680000 {
22		compatible = "arm,pl330", "arm,primecell";
23		reg = <0x12680000 0x1000>;
24		interrupts = <99>;
25		#dma-cells = <1>;
26		#dma-channels = <8>;
27		#dma-requests = <32>;
28	};
29
30Client drivers (device nodes requiring dma transfers from dev-to-mem or
31mem-to-dev) should specify the DMA channel numbers and dma channel names
32as shown below.
33
34  [property name]  = <[phandle of the dma controller] [dma request id]>;
35  [property name]  = <[dma channel name]>
36
37      where 'dma request id' is the dma request number which is connected
38      to the client controller. The 'property name' 'dmas' and 'dma-names'
39      as required by the generic dma device tree binding helpers. The dma
40      names correspond 1:1 with the dma request ids in the dmas property.
41
42  Example:  dmas = <&pdma0 12
43		    &pdma1 11>;
44	    dma-names = "tx", "rx";
45