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