xref: /linux/Documentation/devicetree/bindings/sound/rockchip,rk3308-codec.yaml (revision 6af91e3d2cfc8bb579b1aa2d22cd91f8c34acdf6) 
1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/sound/rockchip,rk3308-codec.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Rockchip RK3308 Internal Codec
8
9description: |
10  This is the audio codec embedded in the Rockchip RK3308
11  SoC. It has 8 24-bit ADCs and 2 24-bit DACs. The maximum supported
12  sampling rate is 192 kHz.
13
14  It is connected internally to one out of a selection of the internal I2S
15  controllers.
16
17  The RK3308 audio codec has 8 independent capture channels, but some
18  features work on stereo pairs called groups:
19    * grp 0 -- MIC1 / MIC2
20    * grp 1 -- MIC3 / MIC4
21    * grp 2 -- MIC5 / MIC6
22    * grp 3 -- MIC7 / MIC8
23
24maintainers:
25  - Luca Ceresoli <luca.ceresoli@bootlin.com>
26
27properties:
28  compatible:
29    const: rockchip,rk3308-codec
30
31  reg:
32    maxItems: 1
33
34  rockchip,grf:
35    $ref: /schemas/types.yaml#/definitions/phandle
36    description:
37      Phandle to the General Register Files (GRF)
38
39  clocks:
40    items:
41      - description: clock for TX
42      - description: clock for RX
43      - description: AHB clock driving the interface
44
45  clock-names:
46    items:
47      - const: mclk_tx
48      - const: mclk_rx
49      - const: hclk
50
51  resets:
52    maxItems: 1
53
54  reset-names:
55    items:
56      - const: codec
57
58  "#sound-dai-cells":
59    const: 0
60
61  rockchip,micbias-avdd-percent:
62    description: |
63      Voltage setting for the MICBIAS pins expressed as a percentage of
64      AVDD.
65
66      E.g. if rockchip,micbias-avdd-percent = 85 and AVDD = 3v3, then the
67      MIC BIAS voltage will be 3.3 V * 85% = 2.805 V.
68
69    enum: [ 50, 55, 60, 65, 70, 75, 80, 85 ]
70
71required:
72  - compatible
73  - reg
74  - rockchip,grf
75  - clocks
76  - resets
77  - "#sound-dai-cells"
78
79additionalProperties: false
80
81examples:
82  - |
83    #include <dt-bindings/clock/rk3308-cru.h>
84
85    audio_codec: audio-codec@ff560000 {
86        compatible = "rockchip,rk3308-codec";
87        reg = <0xff560000 0x10000>;
88        rockchip,grf = <&grf>;
89        clock-names = "mclk_tx", "mclk_rx", "hclk";
90        clocks = <&cru SCLK_I2S2_8CH_TX_OUT>,
91                 <&cru SCLK_I2S2_8CH_RX_OUT>,
92                 <&cru PCLK_ACODEC>;
93        reset-names = "codec";
94        resets = <&cru SRST_ACODEC_P>;
95        #sound-dai-cells = <0>;
96    };
97
98...
99