1* Rockchip I2S controller
2
3The I2S bus (Inter-IC sound bus) is a serial link for digital
4audio data transfer between devices in the system.
5
6Required 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
24Example for rk3288 I2S controller:
25
26i2s@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};
36