summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/sound/simple-card.txt
blob: cf3979eb357809052b187cc27364eefd877e968b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
Simple-Card:

Simple-Card specifies audio DAI connections 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,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.
- simple-audio-card,mclk-fs             : Multiplication factor between stream rate and codec
					  mclk. When defined, mclk-fs property defined in
					  dai-link sub nodes are ignored.
- simple-audio-card,hp-det-gpio		: Reference to GPIO that signals when
					  headphones are attached.
- simple-audio-card,mic-det-gpio	: Reference to GPIO that signals when
					  a microphone is attached.

Optional subnodes:

- simple-audio-card,dai-link		: Container for dai-link level
					  properties and the CPU and CODEC
					  sub-nodes. This container may be
					  omitted when the card has only one
					  DAI link. See the examples and the
					  section bellow.

Dai-link subnode properties and subnodes:

If dai-link subnode is omitted and the subnode properties are directly
under "sound"-node the subnode property and subnode names have to be
prefixed with "simple-audio-card,"-prefix.

Required dai-link subnodes:

- cpu					: CPU   sub-node
- codec					: CODEC sub-node

Optional dai-link subnode properties:

- format				: CPU/CODEC common audio format.
					  "i2s", "right_j", "left_j" , "dsp_a"
					  "dsp_b", "ac97", "pdm", "msb", "lsb"
- frame-master				: Indicates dai-link frame master.
					  phandle to a cpu or codec subnode.
- bitclock-master			: Indicates dai-link bit clock master.
					  phandle to a cpu or codec subnode.
- bitclock-inversion			: bool property. Add this if the
					  dai-link uses bit clock inversion.
- frame-inversion			: bool property. Add this if the
					  dai-link uses frame clock inversion.
- mclk-fs             			: Multiplication factor between stream
					  rate and codec mclk, applied only for
					  the dai-link.

For backward compatibility the frame-master and bitclock-master
properties can be used as booleans in codec subnode to indicate if the
codec is the dai-link frame or bit clock master. In this case there
should be no dai-link node, the same properties should not be present
at sound-node level, and the bitclock-inversion and frame-inversion
properties should also be placed in the codec node if needed.

Required CPU/CODEC subnodes properties:

- sound-dai				: phandle and port of CPU/CODEC

Optional CPU/CODEC subnodes properties:

- dai-tdm-slot-num			: Please refer to tdm-slot.txt.
- dai-tdm-slot-width			: Please refer to tdm-slot.txt.
- 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 - 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,bitclock-master = <&dailink0_master>;
	simple-audio-card,frame-master = <&dailink0_master>;
	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";

	simple-audio-card,cpu {
		sound-dai = <&sh_fsi2 0>;
	};

	dailink0_master: simple-audio-card,codec {
		sound-dai = <&ak4648>;
		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,dai-link@0 {		/* I2S - HDMI */
		format = "i2s";
		cpu {
			sound-dai = <&audio1 0>;
		};
		codec {
			sound-dai = <&tda998x 0>;
		};
	};

	simple-audio-card,dai-link@1 {		/* S/PDIF - HDMI */
		cpu {
			sound-dai = <&audio1 1>;
		};
		codec {
			sound-dai = <&tda998x 1>;
		};
	};

	simple-audio-card,dai-link@2 {		/* S/PDIF - S/PDIF */
		cpu {
			sound-dai = <&audio1 1>;
		};
		codec {
			sound-dai = <&spdif_codec>;
		};
	};
};