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Commit 38c81719 authored by Maxime Ripard's avatar Maxime Ripard Committed by Mark Brown
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ASoC: sunxi: Add A10 I2S controller binding documentation 



Introduce the device tree binding for the I2S controller found in the
Allwinner A10 and later SoCs.

Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 1a695a90

Documentation/devicetree/bindings/sound/sun4i-i2s.txt

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* Allwinner A10 I2S controller



The I2S bus (Inter-IC sound bus) is a serial link for digital

audio data transfer between devices in the system.



Required properties:



- compatible: should be one of the followings

   - "allwinner,sun4i-a10-i2s"

- reg: physical base address of the controller and length of memory mapped

  region.

- interrupts: should contain the I2S interrupt.

- dmas: DMA specifiers for tx and rx dma. See the DMA client binding,

	Documentation/devicetree/bindings/dma/dma.txt

- dma-names: should include "tx" and "rx".

- clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names.

- clock-names: should contain followings:

   - "apb" : clock for the I2S bus interface

   - "mod" : module clock for the I2S controller

- #sound-dai-cells : Must be equal to 0



Example:



i2s0: i2s@01c22400 {

	#sound-dai-cells = <0>;

	compatible = "allwinner,sun4i-a10-i2s";

	reg = <0x01c22400 0x400>;

	interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;

	clocks = <&apb0_gates 3>, <&i2s0_clk>;

	clock-names = "apb", "mod";

	dmas = <&dma SUN4I_DMA_NORMAL 3>,

	       <&dma SUN4I_DMA_NORMAL 3>;

	dma-names = "rx", "tx";

};