* Rockchip Audio PWM controller
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Required properties:
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- compatible: "rockchip,audio-pwm-v1"
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- reg: physical base address of the controller and length of memory mapped
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region.
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- dmas: DMA specifiers for tx dma. See the DMA client binding,
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Documentation/devicetree/bindings/dma/dma.txt
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- dma-names: should include "tx".
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- clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names.
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- clock-names: should contain following:
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- "clk" : clock for Audio PWM controller
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- "hclk": clock for AHB BUS
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- pinctrl-names: Must contain a "default" entry.
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- pinctrl-N: One property must exist for each entry in
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pinctrl-names. See ../pinctrl/pinctrl-bindings.txt
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for details of the property values.
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Optional properties:
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- rockchip,sample-width-bits: Output sampling data width,the value ranges from 8 to 11 bits.
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- rockchip,interpolat-points-cfg: Interpolation rate,the value must be 1/3/7/15 points,
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if this is set,the linear interpolation mode will be turned on.
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- spk-ctl-gpios: The gpio of speak controller.
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Example for Audio PWM controller:
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audpwm: audpwm@ff840000 {
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compatible = "rockchip,audio-pwm-v1";
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reg = <0xff840000 0x1000>;
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clocks = <&cru SCLK_AUDPWM>, <&cru HCLK_AUDPWM>;
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clock-names = "clk", "hclk";
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dmas = <&dmac 26>;
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dma-names = "tx";
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pinctrl-names = "default";
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pinctrl-0 = <&audpwmm0_pins>;
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rockchip,sample-width-bits = <11>;
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rockchip,interpolat-points = <1>;
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spk-ctl-gpios = <&gpio0 RK_PC0 GPIO_ACTIVE_HIGH>;
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status = "disabled";
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};
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