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