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Commit 7f37a3d8 authored by Jun Nie's avatar Jun Nie Committed by Vinod Koul
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Documentation: dma: Add documentation for ZTE DMA 



This patch adds documentation for the ZTE ZX296702 SoC DMA device
DTS binding.

Signed-off-by: default avatarJun Nie <jun.nie@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent d770e558

Documentation/devicetree/bindings/dma/zxdma.txt

0 → 100644
+38 −0
Original line number Diff line number Diff line 
* ZTE ZX296702 DMA controller



Required properties:

- compatible: Should be "zte,zx296702-dma"

- reg: Should contain DMA registers location and length.

- interrupts: Should contain one interrupt shared by all channel

- #dma-cells: see dma.txt, should be 1, para number

- dma-channels: physical channels supported

- dma-requests: virtual channels supported, each virtual channel

		have specific request line

- clocks: clock required



Example:



Controller:

	dma: dma-controller@0x09c00000{

		compatible = "zte,zx296702-dma";

		reg = <0x09c00000 0x1000>;

		clocks = <&topclk ZX296702_DMA_ACLK>;

		interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;

		#dma-cells = <1>;

		dma-channels = <24>;

		dma-requests = <24>;

	};



Client:

Use specific request line passing from dmax

For example, spdif0 tx channel request line is 4

	spdif0: spdif0@0b004000 {

		#sound-dai-cells = <0>;

		compatible = "zte,zx296702-spdif";

		reg = <0x0b004000 0x1000>;

		clocks = <&lsp0clk ZX296702_SPDIF0_DIV>;

		clock-names = "tx";

		interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;

		dmas = <&dma 4>;

		dma-names = "tx";

	}