tjh.dev
Linux kernel mirror (for testing)
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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/sound/fsl,audmix.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: NXP Audio Mixer (AUDMIX).
8
9maintainers:
10 - Shengjiu Wang <shengjiu.wang@nxp.com>
11 - Frank Li <Frank.Li@nxp.com>
12
13description: |
14 The Audio Mixer is a on-chip functional module that allows mixing of two
15 audio streams into a single audio stream. Audio Mixer has two input serial
16 audio interfaces. These are driven by two Synchronous Audio interface
17 modules (SAI). Each input serial interface carries 8 audio channels in its
18 frame in TDM manner. Mixer mixes audio samples of corresponding channels
19 from two interfaces into a single sample. Before mixing, audio samples of
20 two inputs can be attenuated based on configuration. The output of the
21 Audio Mixer is also a serial audio interface. Like input interfaces it has
22 the same TDM frame format. This output is used to drive the serial DAC TDM
23 interface of audio codec and also sent to the external pins along with the
24 receive path of normal audio SAI module for readback by the CPU.
25
26 The output of Audio Mixer can be selected from any of the three streams
27 - serial audio input 1
28 - serial audio input 2
29 - mixed audio
30
31 Mixing operation is independent of audio sample rate but the two audio
32 input streams must have same audio sample rate with same number of channels
33 in TDM frame to be eligible for mixing.
34
35properties:
36 compatible:
37 enum:
38 - fsl,imx8qm-audmix
39 - fsl,imx952-audmix
40
41 reg:
42 maxItems: 1
43
44 clocks:
45 maxItems: 1
46
47 clock-names:
48 items:
49 - const: ipg
50
51 power-domains:
52 maxItems: 1
53
54 dais:
55 description: contain a list of phandles to AUDMIX connected DAIs.
56 $ref: /schemas/types.yaml#/definitions/phandle-array
57 minItems: 2
58 items:
59 - description: the AUDMIX output
60 maxItems: 1
61 - description: serial audio input 1
62 maxItems: 1
63 - description: serial audio input 2
64 maxItems: 1
65
66 ports:
67 $ref: /schemas/graph.yaml#/properties/ports
68 patternProperties:
69 '^port@[0-1]':
70 $ref: audio-graph-port.yaml#
71 unevaluatedProperties: false
72 description: Input port from SAI TX
73
74 properties:
75 port@2:
76 $ref: audio-graph-port.yaml#
77 unevaluatedProperties: false
78 description: Output port to SAI RX
79
80required:
81 - compatible
82 - reg
83 - clocks
84 - clock-names
85
86allOf:
87 - if:
88 properties:
89 compatible:
90 contains:
91 enum:
92 - fsl,imx8qm-audmix
93 then:
94 required:
95 - power-domains
96
97unevaluatedProperties: false
98
99examples:
100 - |
101 audmix@59840000 {
102 compatible = "fsl,imx8qm-audmix";
103 reg = <0x59840000 0x10000>;
104 clocks = <&amix_lpcg 0>;
105 clock-names = "ipg";
106 power-domains = <&pd_audmix>;
107 dais = <&sai4>, <&sai5>;
108
109 ports {
110 #address-cells = <1>;
111 #size-cells = <0>;
112
113 port@0 {
114 reg = <0>;
115 playback-only;
116
117 amix_endpoint0: endpoint {
118 dai-tdm-slot-num = <8>;
119 dai-tdm-slot-width = <32>;
120 dai-tdm-slot-width-map = <32 8 32>;
121 dai-format = "dsp_a";
122 remote-endpoint = <&be00_ep>;
123 };
124 };
125
126 port@1 {
127 reg = <1>;
128 playback-only;
129
130 amix_endpoint1: endpoint {
131 dai-tdm-slot-num = <8>;
132 dai-tdm-slot-width = <32>;
133 dai-tdm-slot-width-map = <32 8 32>;
134 dai-format = "dsp_a";
135 remote-endpoint = <&be01_ep>;
136 };
137 };
138
139 port@2 {
140 reg = <2>;
141 capture-only;
142
143 amix_endpoint2: endpoint {
144 dai-tdm-slot-num = <8>;
145 dai-tdm-slot-width = <32>;
146 dai-tdm-slot-width-map = <32 8 32>;
147 dai-format = "dsp_a";
148 bitclock-master;
149 frame-master;
150 remote-endpoint = <&be02_ep>;
151 };
152 };
153 };
154 };