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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,name : User specified audio sound card name, one string
property.
- 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,widgets : Please refer to widgets.txt.
- 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.
- dai-tdm-slot-num : Please refer to tdm-slot.txt.
- dai-tdm-slot-width : Please refer to tdm-slot.txt.
Required subnodes:
- simple-audio-card,dai-link : container for the CPU and CODEC sub-nodes
This container may be omitted when the
card has only one DAI link.
See the examples.
- 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)
Note:
* For 'format', 'frame-master', 'bitclock-master', 'bitclock-inversion' and
'frame-inversion', the simple card will use the settings of CODEC for both
CPU and CODEC sides as we need to keep the settings identical for both ends
of the link.
Example 1 - single DAI link:
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "VF610-Tower-Sound-Card";
simple-audio-card,format = "left_j";
simple-audio-card,widgets =
"Microphone", "Microphone Jack",
"Headphone", "Headphone Jack",
"Speaker", "External Speaker";
simple-audio-card,routing =
"MIC_IN", "Microphone Jack",
"Headphone Jack", "HP_OUT",
"External Speaker", "LINE_OUT";
dai-tdm-slot-num = <2>;
dai-tdm-slot-width = <8>;
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>;
};
Example 2 - many DAI links:
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "Cubox Audio";
simple-audio-card,format = "i2s";
simple-audio-card,dai-link@0 { /* I2S - HDMI */
simple-audio-card,cpu {
sound-dai = <&audio1 0>;
};
simple-audio-card,codec {
sound-dai = <&tda998x 0>;
};
};
simple-audio-card,dai-link@1 { /* S/PDIF - HDMI */
simple-audio-card,cpu {
sound-dai = <&audio1 1>;
};
simple-audio-card,codec {
sound-dai = <&tda998x 1>;
};
};
simple-audio-card,dai-link@2 { /* S/PDIF - S/PDIF */
simple-audio-card,cpu {
sound-dai = <&audio1 1>;
};
simple-audio-card,codec {
sound-dai = <&spdif_codec>;
};
};
};
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