summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.yaml
blob: 28417b31b5589b2bcb27e648643387a9a1500069 (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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: "http://devicetree.org/schemas/iio/adc/st,stm32-adc.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: STMicroelectronics STM32 ADC bindings

description: |
  STM32 ADC is a successive approximation analog-to-digital converter.
  It has several multiplexed input channels. Conversions can be performed
  in single, continuous, scan or discontinuous mode. Result of the ADC is
  stored in a left-aligned or right-aligned 32-bit data register.
  Conversions can be launched in software or using hardware triggers.

  The analog watchdog feature allows the application to detect if the input
  voltage goes beyond the user-defined, higher or lower thresholds.

  Each STM32 ADC block can have up to 3 ADC instances.

maintainers:
  - Fabrice Gasnier <fabrice.gasnier@st.com>

properties:
  compatible:
    enum:
      - st,stm32f4-adc-core
      - st,stm32h7-adc-core
      - st,stm32mp1-adc-core

  reg:
    maxItems: 1

  interrupts:
    description: |
      One or more interrupts for ADC block, depending on part used:
        - stm32f4 and stm32h7 share a common ADC interrupt line.
        - stm32mp1 has two separate interrupt lines, one for each ADC within
          ADC block.
    minItems: 1
    maxItems: 2

  clocks:
    description: |
      Core can use up to two clocks, depending on part used:
        - "adc" clock: for the analog circuitry, common to all ADCs.
          It's required on stm32f4.
          It's optional on stm32h7 and stm32mp1.
        - "bus" clock: for registers access, common to all ADCs.
          It's not present on stm32f4.
          It's required on stm32h7 and stm32mp1.

  clock-names: true

  st,max-clk-rate-hz:
    description:
      Allow to specify desired max clock rate used by analog circuitry.

  vdda-supply:
    description: Phandle to the vdda input analog voltage.

  vref-supply:
    description: Phandle to the vref input analog reference voltage.

  booster-supply:
    description:
      Phandle to the embedded booster regulator that can be used to supply ADC
      analog input switches on stm32h7 and stm32mp1.

  vdd-supply:
    description:
      Phandle to the vdd input voltage. It can be used to supply ADC analog
      input switches on stm32mp1.

  st,syscfg:
    description:
      Phandle to system configuration controller. It can be used to control the
      analog circuitry on stm32mp1.
    $ref: "/schemas/types.yaml#/definitions/phandle-array"

  interrupt-controller: true

  '#interrupt-cells':
    const: 1

  '#address-cells':
    const: 1

  '#size-cells':
    const: 0

allOf:
  - if:
      properties:
        compatible:
          contains:
            const: st,stm32f4-adc-core

    then:
      properties:
        clocks:
          maxItems: 1

        clock-names:
          const: adc

        interrupts:
          items:
            - description: interrupt line common for all ADCs

        st,max-clk-rate-hz:
          minimum: 600000
          maximum: 36000000
          default: 36000000

        booster-supply: false

        vdd-supply: false

        st,syscfg: false

  - if:
      properties:
        compatible:
          contains:
            const: st,stm32h7-adc-core

    then:
      properties:
        clocks:
          minItems: 1
          maxItems: 2

        clock-names:
          items:
            - const: bus
            - const: adc
          minItems: 1
          maxItems: 2

        interrupts:
          items:
            - description: interrupt line common for all ADCs

        st,max-clk-rate-hz:
          minimum: 120000
          maximum: 36000000
          default: 36000000

        vdd-supply: false

        st,syscfg: false

  - if:
      properties:
        compatible:
          contains:
            const: st,stm32mp1-adc-core

    then:
      properties:
        clocks:
          minItems: 1
          maxItems: 2

        clock-names:
          items:
            - const: bus
            - const: adc
          minItems: 1
          maxItems: 2

        interrupts:
          items:
            - description: interrupt line for ADC1
            - description: interrupt line for ADC2

        st,max-clk-rate-hz:
          minimum: 120000
          maximum: 36000000
          default: 36000000

additionalProperties: false

required:
  - compatible
  - reg
  - interrupts
  - clocks
  - clock-names
  - vdda-supply
  - vref-supply
  - interrupt-controller
  - '#interrupt-cells'
  - '#address-cells'
  - '#size-cells'

patternProperties:
  "^adc@[0-9]+$":
    type: object
    description:
      An ADC block node should contain at least one subnode, representing an
      ADC instance available on the machine.

    properties:
      compatible:
        enum:
          - st,stm32f4-adc
          - st,stm32h7-adc
          - st,stm32mp1-adc

      reg:
        description: |
          Offset of ADC instance in ADC block. Valid values are:
            - 0x0:   ADC1
            - 0x100: ADC2
            - 0x200: ADC3 (stm32f4 only)
        maxItems: 1

      '#io-channel-cells':
        const: 1

      interrupts:
        description: |
          IRQ Line for the ADC instance. Valid values are:
            - 0 for adc@0
            - 1 for adc@100
            - 2 for adc@200 (stm32f4 only)
        maxItems: 1

      clocks:
        description:
          Input clock private to this ADC instance. It's required only on
          stm32f4, that has per instance clock input for registers access.
        maxItems: 1

      dmas:
        description: RX DMA Channel
        maxItems: 1

      dma-names:
        const: rx

      assigned-resolution-bits:
        description: |
          Resolution (bits) to use for conversions:
            - can be 6, 8, 10 or 12 on stm32f4
            - can be 8, 10, 12, 14 or 16 on stm32h7 and stm32mp1
        $ref: /schemas/types.yaml#/definitions/uint32

      st,adc-channels:
        description: |
          List of single-ended channels muxed for this ADC. It can have up to:
            - 16 channels, numbered from 0 to 15 (for in0..in15) on stm32f4
            - 20 channels, numbered from 0 to 19 (for in0..in19) on stm32h7 and
              stm32mp1.
        $ref: /schemas/types.yaml#/definitions/uint32-array

      st,adc-diff-channels:
        description: |
          List of differential channels muxed for this ADC. Some channels can
          be configured as differential instead of single-ended on stm32h7 and
          on stm32mp1. Positive and negative inputs pairs are listed:
          <vinp vinn>, <vinp vinn>,... vinp and vinn are numbered from 0 to 19.

          Note: At least one of "st,adc-channels" or "st,adc-diff-channels" is
          required. Both properties can be used together. Some channels can be
          used as single-ended and some other ones as differential (mixed). But
          channels can't be configured both as single-ended and differential.
        $ref: /schemas/types.yaml#/definitions/uint32-matrix
        items:
          items:
            - description: |
                "vinp" indicates positive input number
              minimum: 0
              maximum: 19
            - description: |
                "vinn" indicates negative input number
              minimum: 0
              maximum: 19

      st,min-sample-time-nsecs:
        description:
          Minimum sampling time in nanoseconds. Depending on hardware (board)
          e.g. high/low analog input source impedance, fine tune of ADC
          sampling time may be recommended. This can be either one value or an
          array that matches "st,adc-channels" and/or "st,adc-diff-channels"
          list, to set sample time resp. for all channels, or independently for
          each channel.
        $ref: /schemas/types.yaml#/definitions/uint32-array

    allOf:
      - if:
          properties:
            compatible:
              contains:
                const: st,stm32f4-adc

        then:
          properties:
            reg:
              enum:
                - 0x0
                - 0x100
                - 0x200

            interrupts:
              minimum: 0
              maximum: 2

            assigned-resolution-bits:
              enum: [6, 8, 10, 12]
              default: 12

            st,adc-channels:
              minItems: 1
              maxItems: 16
              items:
                minimum: 0
                maximum: 15

            st,adc-diff-channels: false

            st,min-sample-time-nsecs:
              minItems: 1
              maxItems: 16
              items:
                minimum: 80

          required:
            - clocks

      - if:
          properties:
            compatible:
              contains:
                enum:
                  - st,stm32h7-adc
                  - st,stm32mp1-adc

        then:
          properties:
            reg:
              enum:
                - 0x0
                - 0x100

            interrupts:
              minimum: 0
              maximum: 1

            assigned-resolution-bits:
              enum: [8, 10, 12, 14, 16]
              default: 16

            st,adc-channels:
              minItems: 1
              maxItems: 20
              items:
                minimum: 0
                maximum: 19

            st,min-sample-time-nsecs:
              minItems: 1
              maxItems: 20
              items:
                minimum: 40

    additionalProperties: false

    anyOf:
      - required:
          - st,adc-channels
      - required:
          - st,adc-diff-channels

    required:
      - compatible
      - reg
      - interrupts
      - '#io-channel-cells'

examples:
  - |
    // Example 1: with stm32f429, ADC1, single-ended channel 8
      adc123: adc@40012000 {
        compatible = "st,stm32f4-adc-core";
        reg = <0x40012000 0x400>;
        interrupts = <18>;
        clocks = <&rcc 0 168>;
        clock-names = "adc";
        st,max-clk-rate-hz = <36000000>;
        vdda-supply = <&vdda>;
        vref-supply = <&vref>;
        interrupt-controller;
        #interrupt-cells = <1>;
        #address-cells = <1>;
        #size-cells = <0>;
        adc@0 {
          compatible = "st,stm32f4-adc";
          #io-channel-cells = <1>;
          reg = <0x0>;
          clocks = <&rcc 0 168>;
          interrupt-parent = <&adc123>;
          interrupts = <0>;
          st,adc-channels = <8>;
          dmas = <&dma2 0 0 0x400 0x0>;
          dma-names = "rx";
          assigned-resolution-bits = <8>;
        };
        // ...
        // other adc child nodes follow...
      };

  - |
    // Example 2: with stm32mp157c to setup ADC1 with:
    // - channels 0 & 1 as single-ended
    // - channels 2 & 3 as differential (with resp. 6 & 7 negative inputs)
      #include <dt-bindings/interrupt-controller/arm-gic.h>
      #include <dt-bindings/clock/stm32mp1-clks.h>
      adc12: adc@48003000 {
        compatible = "st,stm32mp1-adc-core";
        reg = <0x48003000 0x400>;
        interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&rcc ADC12>, <&rcc ADC12_K>;
        clock-names = "bus", "adc";
        booster-supply = <&booster>;
        vdd-supply = <&vdd>;
        vdda-supply = <&vdda>;
        vref-supply = <&vref>;
        st,syscfg = <&syscfg>;
        interrupt-controller;
        #interrupt-cells = <1>;
        #address-cells = <1>;
        #size-cells = <0>;
        adc@0 {
          compatible = "st,stm32mp1-adc";
          #io-channel-cells = <1>;
          reg = <0x0>;
          interrupt-parent = <&adc12>;
          interrupts = <0>;
          st,adc-channels = <0 1>;
          st,adc-diff-channels = <2 6>, <3 7>;
          st,min-sample-time-nsecs = <5000>;
          dmas = <&dmamux1 9 0x400 0x05>;
          dma-names = "rx";
        };
        // ...
        // other adc child node follow...
      };

...