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| -rw-r--r-- | Documentation/devicetree/bindings/dma/sun4i-dma.txt | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/sun4i-dma.txt b/Documentation/devicetree/bindings/dma/sun4i-dma.txt new file mode 100644 index 000000000..8ad556aca --- /dev/null +++ b/Documentation/devicetree/bindings/dma/sun4i-dma.txt @@ -0,0 +1,45 @@ +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>; + }; |