Kernel-4.18.0-80.el8_sun4i-dma

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@1c02000 {
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@1c17000 {
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”;
#address-cells = <1>;
#size-cells = <0>;
};