64 lines
2 KiB
Plaintext
64 lines
2 KiB
Plaintext
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Allwinner SUN8I audio codec
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------------------------------------
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On Sun8i-A33 SoCs, the audio is separated in different parts:
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- A DAI driver. It uses the "sun4i-i2s" driver which is
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documented here:
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Documentation/devicetree/bindings/sound/sun4i-i2s.txt
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- An analog part of the codec which is handled as PRCM registers.
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See Documentation/devicetree/bindings/sound/sun8i-codec-analog.txt
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- An digital part of the codec which is documented in this current
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binding documentation.
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- And finally, an audio card which links all the above components.
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The simple-audio card will be used.
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See Documentation/devicetree/bindings/sound/simple-card.txt
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This bindings documentation exposes Sun8i codec (digital part).
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Required properties:
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- compatible: must be "allwinner,sun8i-a33-codec"
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- reg: must contain the registers location and length
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- interrupts: must contain the codec interrupt
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- clocks: a list of phandle + clock-specifer pairs, one for each entry
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in clock-names.
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- clock-names: should contain followings:
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- "bus": the parent APB clock for this controller
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- "mod": the parent module clock
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Here is an example to add a sound card and the codec binding on sun8i SoCs that
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are similar to A33 using simple-card:
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sound {
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compatible = "simple-audio-card";
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simple-audio-card,name = "sun8i-a33-audio";
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simple-audio-card,format = "i2s";
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simple-audio-card,frame-master = <&link_codec>;
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simple-audio-card,bitclock-master = <&link_codec>;
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simple-audio-card,mclk-fs = <512>;
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simple-audio-card,aux-devs = <&codec_analog>;
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simple-audio-card,routing =
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"Left DAC", "Digital Left DAC",
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"Right DAC", "Digital Right DAC";
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simple-audio-card,cpu {
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sound-dai = <&dai>;
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};
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link_codec: simple-audio-card,codec {
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sound-dai = <&codec>;
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};
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soc@1c00000 {
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[...]
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audio-codec@1c22e00 {
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#sound-dai-cells = <0>;
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compatible = "allwinner,sun8i-a33-codec";
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reg = <0x01c22e00 0x400>;
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interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&ccu CLK_BUS_CODEC>, <&ccu CLK_AC_DIG>;
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clock-names = "bus", "mod";
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};
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};
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