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1 * Rockchip I2S controller
2
3 The I2S bus (Inter-IC sound bus) is a serial link for digital
4 audio data transfer between devices in the system.
5
6 Required properties:
7
8 - compatible: should be one of the followings
9    - "rockchip,rk3066-i2s": for rk3066
10    - "rockchip,rk3188-i2s", "rockchip,rk3066-i2s": for rk3188
11    - "rockchip,rk3288-i2s", "rockchip,rk3066-i2s": for rk3288
12 - reg: physical base address of the controller and length of memory mapped
13   region.
14 - interrupts: should contain the I2S interrupt.
15 - dmas: DMA specifiers for tx and rx dma. See the DMA client binding,
16         Documentation/devicetree/bindings/dma/dma.txt
17 - dma-names: should include "tx" and "rx".
18 - clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names.
19 - clock-names: should contain followings:
20    - "i2s_hclk": clock for I2S BUS
21    - "i2s_clk" : clock for I2S controller
22 - rockchip,capture-channels: max capture channels, if not set, 2 channels default.
23
24 Example for rk3288 I2S controller:
25
26 i2s@ff890000 {
27         compatible = "rockchip,rk3288-i2s", "rockchip,rk3066-i2s";
28         reg = <0xff890000 0x10000>;
29         interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
30         dmas = <&pdma1 0>, <&pdma1 1>;
31         dma-names = "tx", "rx";
32         clock-names = "i2s_hclk", "i2s_clk";
33         clocks = <&cru HCLK_I2S0>, <&cru SCLK_I2S0>;
34         rockchip,capture-channels = <2>;
35 };