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| -rw-r--r-- | Documentation/devicetree/bindings/sound/rockchip-i2s.txt | 49 |
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diff --git a/Documentation/devicetree/bindings/sound/rockchip-i2s.txt b/Documentation/devicetree/bindings/sound/rockchip-i2s.txt new file mode 100644 index 000000000..54aefab71 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/rockchip-i2s.txt @@ -0,0 +1,49 @@ +* Rockchip 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 following: + - "rockchip,rk3066-i2s": for rk3066 + - "rockchip,px30-i2s", "rockchip,rk3066-i2s": for px30 + - "rockchip,rk3036-i2s", "rockchip,rk3066-i2s": for rk3036 + - "rockchip,rk3188-i2s", "rockchip,rk3066-i2s": for rk3188 + - "rockchip,rk3228-i2s", "rockchip,rk3066-i2s": for rk3228 + - "rockchip,rk3288-i2s", "rockchip,rk3066-i2s": for rk3288 + - "rockchip,rk3328-i2s", "rockchip,rk3066-i2s": for rk3328 + - "rockchip,rk3366-i2s", "rockchip,rk3066-i2s": for rk3366 + - "rockchip,rk3368-i2s", "rockchip,rk3066-i2s": for rk3368 + - "rockchip,rk3399-i2s", "rockchip,rk3066-i2s": for rk3399 +- 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 the following: + - "i2s_hclk": clock for I2S BUS + - "i2s_clk" : clock for I2S controller +- rockchip,playback-channels: max playback channels, if not set, 8 channels default. +- rockchip,capture-channels: max capture channels, if not set, 2 channels default. + +Required properties for controller which support multi channels +playback/capture: + +- rockchip,grf: the phandle of the syscon node for GRF register. + +Example for rk3288 I2S controller: + +i2s@ff890000 { + compatible = "rockchip,rk3288-i2s", "rockchip,rk3066-i2s"; + reg = <0xff890000 0x10000>; + interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>; + dmas = <&pdma1 0>, <&pdma1 1>; + dma-names = "tx", "rx"; + clock-names = "i2s_hclk", "i2s_clk"; + clocks = <&cru HCLK_I2S0>, <&cru SCLK_I2S0>; + rockchip,playback-channels = <8>; + rockchip,capture-channels = <2>; +}; |