Kernel-4.18.0-80.el8_arm-pl08x

• ARM PrimeCells PL080 and PL081 and derivatives DMA controller

Required properties:

• compatible: “arm,pl080”, “arm,primecell”;

      "arm,pl081", "arm,primecell";
      "faraday,ftdmac020", "arm,primecell"
  

• arm,primecell-periphid: on the FTDMAC020 the primecell ID is not hard-coded
  in the hardware and must be specified here as <0x0003b080>. This number
  follows the PrimeCell standard numbering using the JEP106 vendor code 0x38
  for Faraday Technology.
• reg: Address range of the PL08x registers
• interrupt: The PL08x interrupt number
• clocks: The clock running the IP core clock
• clock-names: Must contain “apb_pclk”
• lli-bus-interface-ahb1: if AHB master 1 is eligible for fetching LLIs
• lli-bus-interface-ahb2: if AHB master 2 is eligible for fetching LLIs
• mem-bus-interface-ahb1: if AHB master 1 is eligible for fetching memory contents
• mem-bus-interface-ahb2: if AHB master 2 is eligible for fetching memory contents
• #dma-cells: must be <2>. First cell should contain the DMA request,

          second cell should contain either 1 or 2 depending on
          which AHB master that is used.
  

Optional properties:

• 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
• memcpy-burst-size: the size of the bursts for memcpy: 1, 4, 8, 16, 32
  64, 128 or 256 bytes are legal values
• memcpy-bus-width: the bus width used for memcpy in bits: 8, 16 or 32 are legal
  values, the Faraday FTDMAC020 can also accept 64 bits

Clients
Required properties:

• dmas: List of DMA controller phandle, request channel and AHB master id
• dma-names: Names of the aforementioned requested channels

Example:

dmac0: dma-controller@10130000 {
compatible = “arm,pl080”, “arm,primecell”;
reg = <0x10130000 0x1000>;
interrupt-parent = <&vica>;
interrupts = <15>;
clocks = <&hclkdma0>;
clock-names = “apb_pclk”;
lli-bus-interface-ahb1;
lli-bus-interface-ahb2;
mem-bus-interface-ahb2;
memcpy-burst-size = <256>;
memcpy-bus-width = <32>;
#dma-cells = <2>;
};

device@40008000 {
…
dmas = <&dmac0 0 2
&dmac0 1 2>;
dma-names = “tx”, “rx”;
…
};