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Simple-Card:
Simple-Card specifies audio DAI connection of SoC <-> codec.
Required properties:
- compatible : "simple-audio-card"
Optional properties:
- simple-audio-card,format : CPU/CODEC common audio format.
"i2s", "right_j", "left_j" , "dsp_a"
"dsp_b", "ac97", "pdm", "msb", "lsb"
Required subnodes:
- simple-audio-card,cpu : CPU sub-node
- simple-audio-card,codec : CODEC sub-node
Required CPU/CODEC subnodes properties:
- sound-dai : phandle and port of CPU/CODEC
Optional CPU/CODEC subnodes properties:
- format : CPU/CODEC specific audio format if needed.
see simple-audio-card,format
- frame-master : bool property. add this if subnode is frame master
- bitclock-master : bool property. add this if subnode is bitclock master
- bitclock-inversion : bool property. add this if subnode has clock inversion
- frame-inversion : bool property. add this if subnode has frame inversion
- 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)
Example:
sound {
compatible = "simple-audio-card";
simple-audio-card,format = "left_j";
simple-audio-card,cpu {
sound-dai = <&sh_fsi2 0>;
};
simple-audio-card,codec {
sound-dai = <&ak4648>;
bitclock-master;
frame-master;
clocks = <&osc>;
};
};
&i2c0 {
ak4648: ak4648@12 {
#sound-dai-cells = <0>;
compatible = "asahi-kasei,ak4648";
reg = <0x12>;
};
};
sh_fsi2: sh_fsi2@ec230000 {
#sound-dai-cells = <1>;
compatible = "renesas,sh_fsi2";
reg = <0xec230000 0x400>;
interrupt-parent = <&gic>;
interrupts = <0 146 0x4>;
};
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