34 lines
1.0 KiB
Plaintext
34 lines
1.0 KiB
Plaintext
* ARM PrimeCell PL330 DMA Controller
|
|
|
|
The ARM PrimeCell PL330 DMA controller can move blocks of memory contents
|
|
between memory and peripherals or memory to memory.
|
|
|
|
Required properties:
|
|
- compatible: should include both "arm,pl330" and "arm,primecell".
|
|
- reg: physical base address of the controller and length of memory mapped
|
|
region.
|
|
- interrupts: interrupt number to the cpu.
|
|
|
|
Optional properties:
|
|
- dma-coherent : Present if dma operations are coherent
|
|
|
|
Example:
|
|
|
|
pdma0: pdma@12680000 {
|
|
compatible = "arm,pl330", "arm,primecell";
|
|
reg = <0x12680000 0x1000>;
|
|
interrupts = <99>;
|
|
};
|
|
|
|
Client drivers (device nodes requiring dma transfers from dev-to-mem or
|
|
mem-to-dev) should specify the DMA channel numbers using a two-value pair
|
|
as shown below.
|
|
|
|
[property name] = <[phandle of the dma controller] [dma request id]>;
|
|
|
|
where 'dma request id' is the dma request number which is connected
|
|
to the client controller. The 'property name' is recommended to be
|
|
of the form <name>-dma-channel.
|
|
|
|
Example: tx-dma-channel = <&pdma0 12>;
|