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- * 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 followings
- - "rockchip,rk3066-i2s": for rk3066
- - "rockchip,rk3188-i2s", "rockchip,rk3066-i2s": for rk3188
- - "rockchip,rk3288-i2s", "rockchip,rk3066-i2s": for rk3288
- - "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 followings:
- - "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>;
- };
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