Kernel-4.18.0-80.el8_arm-pl330

• 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
• #dma-cells: must be <1>. used to represent the number of integer
  cells in the dmas property of client device.
• dma-channels: contains the total number of DMA channels supported by the DMAC
• dma-requests: contains the total number of DMA requests supported by the DMAC
• arm,pl330-broken-no-flushp: quirk for avoiding to execute DMAFLUSHP

Example:

pdma0: pdma@12680000 {
    compatible = "arm,pl330", "arm,primecell";
    reg = <0x12680000 0x1000>;
    interrupts = <99>;
    #dma-cells = <1>;
    #dma-channels = <8>;
    #dma-requests = <32>;
};

Client drivers (device nodes requiring dma transfers from dev-to-mem or
mem-to-dev) should specify the DMA channel numbers and dma channel names
as shown below.

[property name] = <[phandle of the dma controller] [dma request id]>;
[property name] = <[dma channel name]>

  where 'dma request id' is the dma request number which is connected
  to the client controller. The 'property name' 'dmas' and 'dma-names'
  as required by the generic dma device tree binding helpers. The dma
  names correspond 1:1 with the dma request ids in the dmas property.

Example: dmas = <&pdma0 12
&pdma1 11>;
dma-names = “tx”, “rx”;