111 lines
3.3 KiB
Plaintext
111 lines
3.3 KiB
Plaintext
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ASoC simple SCU Sound Card
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Simple-Card specifies audio DAI connections of SoC <-> codec.
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Required properties:
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- compatible : "simple-scu-audio-card"
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"renesas,rsrc-card"
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Optional properties:
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- simple-audio-card,name : User specified audio sound card name, one string
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property.
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- simple-audio-card,cpu : CPU sub-node
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- simple-audio-card,codec : CODEC sub-node
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Optional subnode properties:
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- simple-audio-card,format : CPU/CODEC common audio format.
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"i2s", "right_j", "left_j" , "dsp_a"
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"dsp_b", "ac97", "pdm", "msb", "lsb"
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- simple-audio-card,frame-master : Indicates dai-link frame master.
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phandle to a cpu or codec subnode.
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- simple-audio-card,bitclock-master : Indicates dai-link bit clock master.
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phandle to a cpu or codec subnode.
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- simple-audio-card,bitclock-inversion : bool property. Add this if the
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dai-link uses bit clock inversion.
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- simple-audio-card,frame-inversion : bool property. Add this if the
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dai-link uses frame clock inversion.
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- simple-audio-card,convert-rate : platform specified sampling rate convert
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- simple-audio-card,convert-channels : platform specified converted channel size (2 - 8 ch)
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- simple-audio-card,prefix : see audio-routing
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- simple-audio-card,routing : A list of the connections between audio components.
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Each entry is a pair of strings, the first being the connection's sink,
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the second being the connection's source. Valid names for sources.
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use audio-prefix if some components is using same sink/sources naming.
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it can be used if compatible was "renesas,rsrc-card";
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Required CPU/CODEC subnodes properties:
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- sound-dai : phandle and port of CPU/CODEC
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Optional CPU/CODEC subnodes properties:
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- clocks / system-clock-frequency : specify subnode's clock if needed.
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it can be specified via "clocks" if system has
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clock node (= common clock), or "system-clock-frequency"
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(if system doens't support common clock)
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If a clock is specified, it is
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enabled with clk_prepare_enable()
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in dai startup() and disabled with
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clk_disable_unprepare() in dai
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shutdown().
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Example 1. Sampling Rate Covert
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sound {
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compatible = "simple-scu-audio-card";
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simple-audio-card,name = "rsnd-ak4643";
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simple-audio-card,format = "left_j";
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simple-audio-card,format = "left_j";
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simple-audio-card,bitclock-master = <&sndcodec>;
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simple-audio-card,frame-master = <&sndcodec>;
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simple-audio-card,convert-rate = <48000>; /* see audio_clk_a */
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simple-audio-card,prefix = "ak4642";
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simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
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"DAI0 Capture", "ak4642 Capture";
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sndcpu: simple-audio-card,cpu {
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sound-dai = <&rcar_sound>;
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};
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sndcodec: simple-audio-card,codec {
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sound-dai = <&ak4643>;
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system-clock-frequency = <11289600>;
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};
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};
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Example 2. 2 CPU 1 Codec
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sound {
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compatible = "renesas,rsrc-card";
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card-name = "rsnd-ak4643";
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format = "left_j";
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bitclock-master = <&dpcmcpu>;
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frame-master = <&dpcmcpu>;
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convert-rate = <48000>; /* see audio_clk_a */
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audio-prefix = "ak4642";
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audio-routing = "ak4642 Playback", "DAI0 Playback",
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"ak4642 Playback", "DAI1 Playback";
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dpcmcpu: cpu@0 {
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sound-dai = <&rcar_sound 0>;
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};
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cpu@1 {
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sound-dai = <&rcar_sound 1>;
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};
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codec {
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sound-dai = <&ak4643>;
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clocks = <&audio_clock>;
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};
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};
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