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1Allwinner A31 DMA Controller
2
3This driver follows the generic DMA bindings defined in dma.txt.
4
5Required properties:
6
7- compatible: Must be one of
8 "allwinner,sun6i-a31-dma"
9 "allwinner,sun8i-a23-dma"
10 "allwinner,sun8i-a83t-dma"
11 "allwinner,sun8i-h3-dma"
12 "allwinner,sun8i-v3s-dma"
13- reg: Should contain the registers base address and length
14- interrupts: Should contain a reference to the interrupt used by this device
15- clocks: Should contain a reference to the parent AHB clock
16- resets: Should contain a reference to the reset controller asserting
17 this device in reset
18- #dma-cells : Should be 1, a single cell holding a line request number
19
20Example:
21 dma: dma-controller@01c02000 {
22 compatible = "allwinner,sun6i-a31-dma";
23 reg = <0x01c02000 0x1000>;
24 interrupts = <0 50 4>;
25 clocks = <&ahb1_gates 6>;
26 resets = <&ahb1_rst 6>;
27 #dma-cells = <1>;
28 };
29
30Clients:
31
32DMA clients connected to the A31 DMA controller must use the format
33described in the dma.txt file, using a two-cell specifier for each
34channel: a phandle plus one integer cells.
35The two cells in order are:
36
371. A phandle pointing to the DMA controller.
382. The port ID as specified in the datasheet
39
40Example:
41spi2: spi@01c6a000 {
42 compatible = "allwinner,sun6i-a31-spi";
43 reg = <0x01c6a000 0x1000>;
44 interrupts = <0 67 4>;
45 clocks = <&ahb1_gates 22>, <&spi2_clk>;
46 clock-names = "ahb", "mod";
47 dmas = <&dma 25>, <&dma 25>;
48 dma-names = "rx", "tx";
49 resets = <&ahb1_rst 22>;
50};