forked from Minki/linux
47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
|
Allwinner A10 DMA Controller
|
||
|
|
|
||
|
|
This driver follows the generic DMA bindings defined in dma.txt.
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
|
||
|
|
- compatible: Must be "allwinner,sun4i-a10-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
|
||
|
|
- #dma-cells : Should be 2, first cell denoting normal or dedicated dma,
|
||
|
|
second cell holding the request line number.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
dma: dma-controller@01c02000 {
|
||
|
|
compatible = "allwinner,sun4i-a10-dma";
|
||
|
|
reg = <0x01c02000 0x1000>;
|
||
|
|
interrupts = <27>;
|
||
|
|
clocks = <&ahb_gates 6>;
|
||
|
|
#dma-cells = <2>;
|
||
|
|
};
|
||
|
|
|
||
|
|
Clients:
|
||
|
|
|
||
|
|
DMA clients connected to the Allwinner A10 DMA controller must use the
|
||
|
|
format described in the dma.txt file, using a three-cell specifier for
|
||
|
|
each channel: a phandle plus two integer cells.
|
||
|
|
The three cells in order are:
|
||
|
|
|
||
|
|
1. A phandle pointing to the DMA controller.
|
||
|
|
2. Whether it is using normal (0) or dedicated (1) channels
|
||
|
|
3. The port ID as specified in the datasheet
|
||
|
|
|
||
|
|
Example:
|
||
|
|
spi2: spi@01c17000 {
|
||
|
|
compatible = "allwinner,sun4i-a10-spi";
|
||
|
|
reg = <0x01c17000 0x1000>;
|
||
|
|
interrupts = <0 12 4>;
|
||
|
|
clocks = <&ahb_gates 22>, <&spi2_clk>;
|
||
|
|
clock-names = "ahb", "mod";
|
||
|
|
dmas = <&dma 1 29>, <&dma 1 28>;
|
||
|
|
dma-names = "rx", "tx";
|
||
|
|
status = "disabled";
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
};
|