xref: /linux/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml (revision d53b8e36925256097a08d7cb749198d85cbf9b2b) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/sound/st,stm32-sai.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: STMicroelectronics STM32 Serial Audio Interface (SAI)
8
9maintainers:
10  - Olivier Moysan <olivier.moysan@foss.st.com>
11
12description:
13  The SAI interface (Serial Audio Interface) offers a wide set of audio
14  protocols as I2S standards, LSB or MSB-justified, PCM/DSP, TDM, and AC'97.
15  The SAI contains two independent audio sub-blocks. Each sub-block has
16  its own clock generator and I/O lines controller.
17
18properties:
19  compatible:
20    enum:
21      - st,stm32f4-sai
22      - st,stm32h7-sai
23
24  reg:
25    items:
26      - description: Base address and size of SAI common register set.
27      - description: Base address and size of SAI identification register set.
28    minItems: 1
29
30  ranges:
31    maxItems: 1
32
33  interrupts:
34    maxItems: 1
35
36  resets:
37    maxItems: 1
38
39  "#address-cells":
40    const: 1
41
42  "#size-cells":
43    const: 1
44
45  clocks:
46    maxItems: 3
47
48  clock-names:
49    maxItems: 3
50
51  access-controllers:
52    minItems: 1
53    maxItems: 2
54
55required:
56  - compatible
57  - reg
58  - ranges
59  - "#address-cells"
60  - "#size-cells"
61  - clocks
62  - clock-names
63
64patternProperties:
65  "^audio-controller@[0-9a-f]+$":
66    type: object
67    additionalProperties: false
68    description:
69      Two subnodes corresponding to SAI sub-block instances A et B
70      can be defined. Subnode can be omitted for unused sub-block.
71
72    properties:
73      compatible:
74        description: Compatible for SAI sub-block A or B.
75        pattern: "^st,stm32-sai-sub-[ab]$"
76
77      "#sound-dai-cells":
78        const: 0
79
80      reg:
81        maxItems: 1
82
83      clocks:
84        items:
85          - description: sai_ck clock feeding the internal clock generator.
86          - description: MCLK clock from a SAI set as master clock provider.
87        minItems: 1
88
89      clock-names:
90        items:
91          - const: sai_ck
92          - const: MCLK
93        minItems: 1
94
95      dmas:
96        maxItems: 1
97
98      dma-names:
99        description: |
100          rx: SAI sub-block is configured as a capture DAI.
101          tx: SAI sub-block is configured as a playback DAI.
102        enum: [ rx, tx ]
103
104      st,sync:
105        description:
106          Configure the SAI sub-block as slave of another SAI sub-block.
107          By default SAI sub-block is in asynchronous mode.
108          Must contain the phandle and index of the SAI sub-block providing
109          the synchronization.
110        $ref: /schemas/types.yaml#/definitions/phandle-array
111        items:
112          - items:
113              - description: phandle of the SAI sub-block
114              - description: index of the SAI sub-block
115
116      st,iec60958:
117        description:
118          If set, support S/PDIF IEC6958 protocol for playback.
119          IEC60958 protocol is not available for capture.
120          By default, custom protocol is assumed, meaning that protocol is
121          configured according to protocol defined in related DAI link node,
122          such as i2s, left justified, right justified, dsp and pdm protocols.
123        $ref: /schemas/types.yaml#/definitions/flag
124
125      "#clock-cells":
126        description: Configure the SAI device as master clock provider.
127        const: 0
128
129      port:
130        $ref: audio-graph-port.yaml#
131        unevaluatedProperties: false
132
133    required:
134      - compatible
135      - "#sound-dai-cells"
136      - reg
137      - clocks
138      - clock-names
139      - dmas
140      - dma-names
141
142allOf:
143  - if:
144      properties:
145        compatible:
146          contains:
147            const: st,stm32f4-sai
148    then:
149      properties:
150        clocks:
151          items:
152            - description: x8k, SAI parent clock for sampling rates multiple of 8kHz.
153            - description: x11k, SAI parent clock for sampling rates multiple of 11.025kHz.
154
155        clock-names:
156          items:
157            - const: x8k
158            - const: x11k
159    else:
160      properties:
161        clocks:
162          items:
163            - description: pclk feeds the peripheral bus interface.
164            - description: x8k, SAI parent clock for sampling rates multiple of 8kHz.
165            - description: x11k, SAI parent clock for sampling rates multiple of 11.025kHz.
166
167        clock-names:
168          items:
169            - const: pclk
170            - const: x8k
171            - const: x11k
172
173additionalProperties: false
174
175examples:
176  - |
177    #include <dt-bindings/interrupt-controller/arm-gic.h>
178    #include <dt-bindings/clock/stm32mp1-clks.h>
179    #include <dt-bindings/reset/stm32mp1-resets.h>
180    sai2: sai@4400b000 {
181      compatible = "st,stm32h7-sai";
182      #address-cells = <1>;
183      #size-cells = <1>;
184      ranges = <0 0x4400b000 0x400>;
185      reg = <0x4400b000 0x4>, <0x4400b3f0 0x10>;
186      clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL3_R>;
187      clock-names = "pclk", "x8k", "x11k";
188      pinctrl-names = "default", "sleep";
189      pinctrl-0 = <&sai2a_pins_a>, <&sai2b_pins_b>;
190      pinctrl-1 = <&sai2a_sleep_pins_a>, <&sai2b_sleep_pins_b>;
191
192      sai2a: audio-controller@4400b004 {
193        #sound-dai-cells = <0>;
194        compatible = "st,stm32-sai-sub-a";
195        reg = <0x4 0x1c>;
196        dmas = <&dmamux1 89 0x400 0x01>;
197        dma-names = "tx";
198        clocks = <&rcc SAI2_K>;
199        clock-names = "sai_ck";
200      };
201    };
202
203...
204