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- Allwinner A31 DMA Controller
- This driver follows the generic DMA bindings defined in dma.txt.
- Required properties:
- - compatible: Must be one of
- "allwinner,sun6i-a31-dma"
- "allwinner,sun8i-a23-dma"
- "allwinner,sun8i-a83t-dma"
- "allwinner,sun8i-h3-dma"
- "allwinner,sun8i-v3s-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
- - resets: Should contain a reference to the reset controller asserting
- this device in reset
- - #dma-cells : Should be 1, a single cell holding a line request number
- Example:
- dma: dma-controller@1c02000 {
- compatible = "allwinner,sun6i-a31-dma";
- reg = <0x01c02000 0x1000>;
- interrupts = <0 50 4>;
- clocks = <&ahb1_gates 6>;
- resets = <&ahb1_rst 6>;
- #dma-cells = <1>;
- };
- ------------------------------------------------------------------------------
- For A64 DMA controller:
- Required properties:
- - compatible: "allwinner,sun50i-a64-dma"
- - dma-channels: Number of DMA channels supported by the controller.
- Refer to Documentation/devicetree/bindings/dma/dma.txt
- - all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells
- Optional properties:
- - dma-requests: Number of DMA request signals supported by the controller.
- Refer to Documentation/devicetree/bindings/dma/dma.txt
- Example:
- dma: dma-controller@1c02000 {
- compatible = "allwinner,sun50i-a64-dma";
- reg = <0x01c02000 0x1000>;
- interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&ccu CLK_BUS_DMA>;
- dma-channels = <8>;
- dma-requests = <27>;
- resets = <&ccu RST_BUS_DMA>;
- #dma-cells = <1>;
- };
- ------------------------------------------------------------------------------
- Clients:
- DMA clients connected to the A31 DMA controller must use the format
- described in the dma.txt file, using a two-cell specifier for each
- channel: a phandle plus one integer cells.
- The two cells in order are:
- 1. A phandle pointing to the DMA controller.
- 2. The port ID as specified in the datasheet
- Example:
- spi2: spi@1c6a000 {
- compatible = "allwinner,sun6i-a31-spi";
- reg = <0x01c6a000 0x1000>;
- interrupts = <0 67 4>;
- clocks = <&ahb1_gates 22>, <&spi2_clk>;
- clock-names = "ahb", "mod";
- dmas = <&dma 25>, <&dma 25>;
- dma-names = "rx", "tx";
- resets = <&ahb1_rst 22>;
- };
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