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be10ee2c KM |
1 | Audio-Graph-SCU-Card: |
2 | ||
3 | Audio-Graph-SCU-Card is "Audio-Graph-Card" + "ALSA DPCM". | |
4 | ||
5 | It is based on common bindings for device graphs. | |
6 | see ${LINUX}/Documentation/devicetree/bindings/graph.txt | |
7 | ||
8 | Basically, Audio-Graph-SCU-Card property is same as | |
9 | Simple-Card / Simple-SCU-Card / Audio-Graph-Card. | |
10 | see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt | |
11 | ${LINUX}/Documentation/devicetree/bindings/sound/simple-scu-card.txt | |
12 | ${LINUX}/Documentation/devicetree/bindings/sound/audio-graph-card.txt | |
13 | ||
14 | Below are same as Simple-Card / Audio-Graph-Card. | |
15 | ||
16 | - label | |
17 | - dai-format | |
18 | - frame-master | |
19 | - bitclock-master | |
20 | - bitclock-inversion | |
21 | - frame-inversion | |
22 | - dai-tdm-slot-num | |
23 | - dai-tdm-slot-width | |
24 | - clocks / system-clock-frequency | |
25 | ||
26 | Below are same as Simple-SCU-Card. | |
27 | ||
28 | - convert-rate | |
29 | - convert-channels | |
30 | - prefix | |
31 | - routing | |
32 | ||
33 | Required properties: | |
34 | ||
35 | - compatible : "audio-graph-scu-card"; | |
36 | - dais : list of CPU DAI port{s} | |
37 | ||
08862251 | 38 | Example 1. Sampling Rate Conversion |
be10ee2c KM |
39 | |
40 | sound_card { | |
41 | compatible = "audio-graph-scu-card"; | |
42 | ||
43 | label = "sound-card"; | |
44 | prefix = "codec"; | |
45 | routing = "codec Playback", "DAI0 Playback", | |
05c00614 | 46 | "DAI0 Capture", "codec Capture"; |
be10ee2c KM |
47 | convert-rate = <48000>; |
48 | ||
49 | dais = <&cpu_port>; | |
50 | }; | |
51 | ||
52 | audio-codec { | |
53 | ... | |
54 | ||
55 | port { | |
56 | codec_endpoint: endpoint { | |
57 | remote-endpoint = <&cpu_endpoint>; | |
58 | }; | |
59 | }; | |
60 | }; | |
61 | ||
62 | dai-controller { | |
63 | ... | |
64 | cpu_port: port { | |
65 | cpu_endpoint: endpoint { | |
66 | remote-endpoint = <&codec_endpoint>; | |
67 | ||
68 | dai-format = "left_j"; | |
69 | ... | |
70 | }; | |
71 | }; | |
72 | }; | |
08862251 KM |
73 | |
74 | Example 2. 2 CPU 1 Codec (Mixing) | |
75 | ||
76 | sound_card { | |
77 | compatible = "audio-graph-scu-card"; | |
78 | ||
79 | label = "sound-card"; | |
80 | prefix = "codec"; | |
81 | routing = "codec Playback", "DAI0 Playback", | |
05c00614 KM |
82 | "codec Playback", "DAI1 Playback", |
83 | "DAI0 Capture", "codec Capture"; | |
08862251 KM |
84 | convert-rate = <48000>; |
85 | ||
86 | dais = <&cpu_port0 | |
87 | &cpu_port1>; | |
88 | }; | |
89 | ||
90 | audio-codec { | |
91 | ... | |
92 | ||
93 | port { | |
f1f94049 | 94 | codec_endpoint0: endpoint { |
08862251 KM |
95 | remote-endpoint = <&cpu_endpoint0>; |
96 | }; | |
f1f94049 KM |
97 | codec_endpoint1: endpoint { |
98 | remote-endpoint = <&cpu_endpoint1>; | |
99 | }; | |
08862251 KM |
100 | }; |
101 | }; | |
102 | ||
103 | dai-controller { | |
104 | ... | |
105 | ports { | |
106 | cpu_port0: port { | |
107 | cpu_endpoint0: endpoint { | |
f1f94049 | 108 | remote-endpoint = <&codec_endpoint0>; |
08862251 KM |
109 | |
110 | dai-format = "left_j"; | |
111 | ... | |
112 | }; | |
113 | }; | |
114 | cpu_port1: port { | |
115 | cpu_endpoint1: endpoint { | |
f1f94049 KM |
116 | remote-endpoint = <&codec_endpoint1>; |
117 | ||
08862251 KM |
118 | dai-format = "left_j"; |
119 | ... | |
120 | }; | |
121 | }; | |
122 | }; | |
123 | }; |