On Thu, May 22, 2014 at 8:34 PM, Maxime Ripard
<maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote:
> The Allwinner A31 DMA controller is rather simple to describe in the DT. Add
> the bindings documentation.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/dma/sun6i-dma.txt | 45 ++++++++++++++++++++++
> 1 file changed, 45 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/dma/sun6i-dma.txt
>
> diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> new file mode 100644
> index 000000000000..5d7c86d52665
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> @@ -0,0 +1,45 @@
> +Allwinner A31 DMA Controller
> +
> +This driver follows the generic DMA bindings defined in dma.txt.
> +
> +Required properties:
> +
> +- compatible: Must be "allwinner,sun6i-a31-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
Extra spaces between the leading tabs.
(Gmail messes up whitespaces, please see original mail.)
> +- #dma-cells : Should be 1, a single cell holding a line request number
> +
> +Example:
> + dma: dma-controller@01c02000 {
> + compatible = "allwinner,sun6i-a31-dma";
> + reg = <0x01c02000 0x1000>;
> + interrupts = <0 50 4>;
> + clocks = <&ahb1_gates 6>;
> + resets = <&ahb1_rst 6>;
> + #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@01c6a000 {
> + 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>;
> +};
> --
> 1.9.3
>
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