mirror of https://gitee.com/openkylin/linux.git
46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
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>;
|
|
};
|