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 following:
9   - "rockchip,rk3066-i2s": for rk3066
10   - "rockchip,px30-i2s", "rockchip,rk3066-i2s": for px30
11   - "rockchip,rk3036-i2s", "rockchip,rk3066-i2s": for rk3036
12   - "rockchip,rk3188-i2s", "rockchip,rk3066-i2s": for rk3188
13   - "rockchip,rk3228-i2s", "rockchip,rk3066-i2s": for rk3228
14   - "rockchip,rk3288-i2s", "rockchip,rk3066-i2s": for rk3288
15   - "rockchip,rk3328-i2s", "rockchip,rk3066-i2s": for rk3328
16   - "rockchip,rk3366-i2s", "rockchip,rk3066-i2s": for rk3366
17   - "rockchip,rk3368-i2s", "rockchip,rk3066-i2s": for rk3368
18   - "rockchip,rk3399-i2s", "rockchip,rk3066-i2s": for rk3399
19- reg: physical base address of the controller and length of memory mapped
20  region.
21- interrupts: should contain the I2S interrupt.
22- dmas: DMA specifiers for tx and rx dma. See the DMA client binding,
23	Documentation/devicetree/bindings/dma/dma.txt
24- dma-names: should include "tx" and "rx".
25- clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names.
26- clock-names: should contain the following:
27   - "i2s_hclk": clock for I2S BUS
28   - "i2s_clk" : clock for I2S controller
29- rockchip,playback-channels: max playback channels, if not set, 8 channels default.
30- rockchip,capture-channels: max capture channels, if not set, 2 channels default.
31
32Required properties for controller which support multi channels
33playback/capture:
34
35- rockchip,grf: the phandle of the syscon node for GRF register.
36
37Example for rk3288 I2S controller:
38
39i2s@ff890000 {
40	compatible = "rockchip,rk3288-i2s", "rockchip,rk3066-i2s";
41	reg = <0xff890000 0x10000>;
42	interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
43	dmas = <&pdma1 0>, <&pdma1 1>;
44	dma-names = "tx", "rx";
45	clock-names = "i2s_hclk", "i2s_clk";
46	clocks = <&cru HCLK_I2S0>, <&cru SCLK_I2S0>;
47	rockchip,playback-channels = <8>;
48	rockchip,capture-channels = <2>;
49};
50