1* Rockchip Audio PWM controller 2 3Required properties: 4 5- compatible: "rockchip,audio-pwm-v1" 6- reg: physical base address of the controller and length of memory mapped 7 region. 8- dmas: DMA specifiers for tx dma. See the DMA client binding, 9 Documentation/devicetree/bindings/dma/dma.txt 10- dma-names: should include "tx". 11- clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names. 12- clock-names: should contain following: 13 - "clk" : clock for Audio PWM controller 14 - "hclk": clock for AHB BUS 15- pinctrl-names: Must contain a "default" entry. 16- pinctrl-N: One property must exist for each entry in 17 pinctrl-names. See ../pinctrl/pinctrl-bindings.txt 18 for details of the property values. 19 20Optional properties: 21 22- rockchip,sample-width-bits: Output sampling data width,the value ranges from 8 to 11 bits. 23- rockchip,interpolat-points-cfg: Interpolation rate,the value must be 1/3/7/15 points, 24 if this is set,the linear interpolation mode will be turned on. 25- spk-ctl-gpios: The gpio of speak controller. 26 27Example for Audio PWM controller: 28 29audpwm: audpwm@ff840000 { 30 compatible = "rockchip,audio-pwm-v1"; 31 reg = <0xff840000 0x1000>; 32 clocks = <&cru SCLK_AUDPWM>, <&cru HCLK_AUDPWM>; 33 clock-names = "clk", "hclk"; 34 dmas = <&dmac 26>; 35 dma-names = "tx"; 36 pinctrl-names = "default"; 37 pinctrl-0 = <&audpwmm0_pins>; 38 rockchip,sample-width-bits = <11>; 39 rockchip,interpolat-points = <1>; 40 spk-ctl-gpios = <&gpio0 RK_PC0 GPIO_ACTIVE_HIGH>; 41 status = "disabled"; 42}; 43