| * 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,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 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>; |
| }; |
