Kernel-4.18.0-80.el8_k3dma

• Hisilicon K3 DMA controller

See dma.txt first

Required properties:

• compatible: Should be “hisilicon,k3-dma-1.0”
• reg: Should contain DMA registers location and length.
• interrupts: Should contain one interrupt shared by all channel
• #dma-cells: see dma.txt, should be 1, para number
• dma-channels: physical channels supported
• dma-requests: virtual channels supported, each virtual channel

    have specific request line
  

• clocks: clock required

Example:

Controller:
dma0: dma@fcd02000 {
compatible = “hisilicon,k3-dma-1.0”;
reg = <0xfcd02000 0x1000>;
#dma-cells = <1>;
dma-channels = <16>;
dma-requests = <27>;
interrupts = <0 12 4>;
clocks = <&pclk>;
};

Client:
Use specific request line passing from dmax
For example, i2c0 read channel request line is 18, while write channel use 19

    i2c0: i2c@fcb08000 {
        compatible = "snps,designware-i2c";
        dmas =    <&dma0 18          /* read channel */
             &dma0 19>;        /* write channel */
        dma-names = "rx", "tx";
    };

    i2c1: i2c@fcb09000 {
        compatible = "snps,designware-i2c";
        dmas =    <&dma0 20          /* read channel */
             &dma0 21>;        /* write channel */
        dma-names = "rx", "tx";
    };