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Allwinner A31 DMA Controller
This driver follows the generic DMA bindings defined in dma.txt.
Required properties:
- compatible: Must be "allwinner,sun6i-a31-dma"
- reg: Should contain the registers base address and length
- interrupts: Should contain a reference to the interrupt used by this device
- clocks: Should contain a reference to the parent AHB clock
- resets: Should contain a reference to the reset controller asserting
this device in reset
- #dma-cells : Should be 1, a single cell holding a line request number
Example:
dma: dma-controller@01c02000 {
compatible = "allwinner,sun6i-a31-dma";
reg = <0x01c02000 0x1000>;
interrupts = <0 50 4>;
clocks = <&ahb1_gates 6>;
resets = <&ahb1_rst 6>;
#dma-cells = <1>;
};
Clients:
DMA clients connected to the A31 DMA controller must use the format
described in the dma.txt file, using a two-cell specifier for each
channel: a phandle plus one integer cells.
The two cells in order are:
1. A phandle pointing to the DMA controller.
2. The port ID as specified in the datasheet
Example:
spi2: spi@01c6a000 {
compatible = "allwinner,sun6i-a31-spi";
reg = <0x01c6a000 0x1000>;
interrupts = <0 67 4>;
clocks = <&ahb1_gates 22>, <&spi2_clk>;
clock-names = "ahb", "mod";
dmas = <&dma 25>, <&dma 25>;
dma-names = "rx", "tx";
resets = <&ahb1_rst 22>;
};
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