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Linux kernel mirror (for testing)
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1.. SPDX-License-Identifier: GPL-2.0
2
3Kernel driver ltc2978
4=====================
5
6Supported chips:
7
8 * Analog Devices LT7170
9
10 Prefix: 'lt7170'
11
12 Addresses scanned: -
13
14 Datasheet: https://www.analog.com/en/products/lt7170.html
15
16 * Analog Devices LT7171
17
18 Prefix: 'lt7171'
19
20 Addresses scanned: -
21
22 Datasheet: https://www.analog.com/en/products/lt7171.html
23
24 * Linear Technology LTC2972
25
26 Prefix: 'ltc2972'
27
28 Addresses scanned: -
29
30 Datasheet: https://www.analog.com/en/products/ltc2972.html
31
32 * Linear Technology LTC2974
33
34 Prefix: 'ltc2974'
35
36 Addresses scanned: -
37
38 Datasheet: https://www.analog.com/en/products/ltc2974
39
40 * Linear Technology LTC2975
41
42 Prefix: 'ltc2975'
43
44 Addresses scanned: -
45
46 Datasheet: https://www.analog.com/en/products/ltc2975
47
48 * Linear Technology LTC2977
49
50 Prefix: 'ltc2977'
51
52 Addresses scanned: -
53
54 Datasheet: https://www.analog.com/en/products/ltc2977
55
56 * Linear Technology LTC2978, LTC2978A
57
58 Prefix: 'ltc2978'
59
60 Addresses scanned: -
61
62 Datasheet: https://www.analog.com/en/products/ltc2978
63
64 https://www.analog.com/en/products/ltc2978a
65
66 * Linear Technology LTC2979
67
68 Prefix: 'ltc2979'
69
70 Addresses scanned: -
71
72 Datasheet: https://www.analog.com/en/products/ltc2979
73
74 * Linear Technology LTC2980
75
76 Prefix: 'ltc2980'
77
78 Addresses scanned: -
79
80 Datasheet: https://www.analog.com/en/products/ltc2980
81
82 * Linear Technology LTC3880
83
84 Prefix: 'ltc3880'
85
86 Addresses scanned: -
87
88 Datasheet: https://www.analog.com/en/products/ltc3880
89
90 * Linear Technology LTC3882
91
92 Prefix: 'ltc3882'
93
94 Addresses scanned: -
95
96 Datasheet: https://www.analog.com/en/products/ltc3882
97
98 * Linear Technology LTC3883
99
100 Prefix: 'ltc3883'
101
102 Addresses scanned: -
103
104 Datasheet: https://www.analog.com/en/products/ltc3883
105
106 * Linear Technology LTC3884
107
108 Prefix: 'ltc3884'
109
110 Addresses scanned: -
111
112 Datasheet: https://www.analog.com/en/products/ltc3884
113
114 * Linear Technology LTC3886
115
116 Prefix: 'ltc3886'
117
118 Addresses scanned: -
119
120 Datasheet: https://www.analog.com/en/products/ltc3886
121
122 * Linear Technology LTC3887
123
124 Prefix: 'ltc3887'
125
126 Addresses scanned: -
127
128 Datasheet: https://www.analog.com/en/products/ltc3887
129
130 * Linear Technology LTC3889
131
132 Prefix: 'ltc3889'
133
134 Addresses scanned: -
135
136 Datasheet: https://www.analog.com/en/products/ltc3889
137
138 * Linear Technology LTC7841
139
140 Prefix: 'ltc7841'
141
142 Addresses scanned: -
143
144 Datasheet: https://www.analog.com/en/products/ltc7841
145
146 * Linear Technology LTC7880
147
148 Prefix: 'ltc7880'
149
150 Addresses scanned: -
151
152 Datasheet: https://www.analog.com/en/products/ltc7880
153
154 * Linear Technology LTM2987
155
156 Prefix: 'ltm2987'
157
158 Addresses scanned: -
159
160 Datasheet: https://www.analog.com/en/products/ltm2987
161
162 * Linear Technology LTM4644
163
164 Prefix: 'ltm4644'
165
166 Addresses scanned: -
167
168 Datasheet: https://www.analog.com/en/products/ltm4644
169
170 * Linear Technology LTM4673
171
172 Prefix: 'ltm4673'
173
174 Addresses scanned: -
175
176 Datasheet: https://www.analog.com/en/products/ltm4673
177
178 * Linear Technology LTM4675
179
180 Prefix: 'ltm4675'
181
182 Addresses scanned: -
183
184 Datasheet: https://www.analog.com/en/products/ltm4675
185
186 * Linear Technology LTM4676
187
188 Prefix: 'ltm4676'
189
190 Addresses scanned: -
191
192 Datasheet: https://www.analog.com/en/products/ltm4676
193
194 * Linear Technology LTM4677
195
196 Prefix: 'ltm4677'
197
198 Addresses scanned: -
199
200 Datasheet: https://www.analog.com/en/products/ltm4677
201
202 * Linear Technology LTM4678
203
204 Prefix: 'ltm4678'
205
206 Addresses scanned: -
207
208 Datasheet: https://www.analog.com/en/products/ltm4678
209
210 * Analog Devices LTM4680
211
212 Prefix: 'ltm4680'
213
214 Addresses scanned: -
215
216 Datasheet: https://www.analog.com/ltm4680
217
218 * Analog Devices LTM4686
219
220 Prefix: 'ltm4686'
221
222 Addresses scanned: -
223
224 Datasheet: https://www.analog.com/ltm4686
225
226 * Analog Devices LTM4700
227
228 Prefix: 'ltm4700'
229
230 Addresses scanned: -
231
232 Datasheet: https://www.analog.com/ltm4700
233
234
235
236Author: Guenter Roeck <linux@roeck-us.net>
237
238
239Description
240-----------
241
242- LT7170 and LT7171 are 20 A, 16 V, single- or dual-phase Silent Switcher
243- step-down regulators with Digital Power System Management.
244- LTC2974 and LTC2975 are quad digital power supply managers.
245- LTC2978 is an octal power supply monitor.
246- LTC2977 is a pin compatible replacement for LTC2978.
247- LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977
248- in a single die. The chip is instantiated and reported as two separate chips
249- on two different I2C bus addresses.
250- LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down
251- DC/DC controllers.
252- LTC3883 is a single phase step-down DC/DC controller.
253- LTM2987 is a 16-channel Power System Manager with two LTC2977 plus
254- additional components on a single die. The chip is instantiated and reported
255- as two separate chips on two different I2C bus addresses.
256- LTM4675 is a dual 9A or single 18A μModule regulator
257- LTM4676 is a dual 13A or single 26A uModule regulator.
258- LTM4686 is a dual 10A or single 20A uModule regulator.
259
260
261Usage Notes
262-----------
263
264This driver does not probe for PMBus devices. You will have to instantiate
265devices explicitly.
266
267Example: the following commands will load the driver for an LTC2978 at address
2680x60 on I2C bus #1::
269
270 # modprobe ltc2978
271 # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device
272
273
274Sysfs attributes
275----------------
276
277======================= ========================================================
278in1_label "vin"
279
280in1_input Measured input voltage.
281
282in1_min Minimum input voltage.
283
284in1_max Maximum input voltage.
285
286 LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
287 LTC2979 and LTM2987 only.
288
289in1_lcrit Critical minimum input voltage.
290
291 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
292 LTC2979 and LTM2987 only.
293
294in1_crit Critical maximum input voltage.
295
296in1_min_alarm Input voltage low alarm.
297
298in1_max_alarm Input voltage high alarm.
299
300 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
301 LTC2979 and LTM2987 only.
302
303in1_lcrit_alarm Input voltage critical low alarm.
304
305 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
306 LTC2979 and LTM2987 only.
307
308in1_crit_alarm Input voltage critical high alarm.
309
310in1_lowest Lowest input voltage.
311
312 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
313 and LTM2987 only.
314
315in1_highest Highest input voltage.
316
317in1_reset_history Reset input voltage history.
318
319in[N]_label "vout[1-8]".
320
321 - LT7170, LT7171: N=2
322 - LTC2972: N=2-3
323 - LTC2974, LTC2975: N=2-5
324 - LTC2977, LTC2979, LTC2980, LTM2987: N=2-9
325 - LTC2978: N=2-9
326 - LTC3880, LTC3882, LTC3884, LTC23886 LTC3887, LTC3889,
327 LTC7880, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678,
328 LTM4680, LTM4700: N=2-3
329 - LTC3883: N=2
330 - LTC7841: N=2
331
332in[N]_input Measured output voltage.
333
334in[N]_min Minimum output voltage.
335
336in[N]_max Maximum output voltage.
337
338in[N]_lcrit Critical minimum output voltage.
339
340in[N]_crit Critical maximum output voltage.
341
342in[N]_min_alarm Output voltage low alarm.
343
344in[N]_max_alarm Output voltage high alarm.
345
346in[N]_lcrit_alarm Output voltage critical low alarm.
347
348in[N]_crit_alarm Output voltage critical high alarm.
349
350in[N]_lowest Lowest output voltage.
351
352 LTC2972, LTC2974, LTC2975,and LTC2978 only.
353
354in[N]_highest Highest output voltage.
355
356in[N]_reset_history Reset output voltage history.
357
358temp[N]_input Measured temperature.
359
360 - On LT7170 and LT7171, temp1 reports the chip
361 temperature.
362 - On LTC2972, temp[1-2] report external temperatures,
363 and temp 3 reports the chip temperature.
364 - On LTC2974 and LTC2975, temp[1-4] report external
365 temperatures, and temp5 reports the chip temperature.
366 - On LTC2977, LTC2979, LTC2980, LTC2978, and LTM2987,
367 only one temperature measurement is supported and
368 reports the chip temperature.
369 - On LTC3880, LTC3882, LTC3886, LTC3887, LTC3889,
370 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
371 and LTM4700, temp1 and temp2 report external
372 temperatures, and temp3 reports the chip temperature.
373 - On LTC3883, temp1 reports an external temperature,
374 and temp2 reports the chip temperature.
375
376temp[N]_min Minimum temperature.
377
378 LTC2972, LTC2974, LCT2977, LTM2980, LTC2978,
379 LTC2979, and LTM2987 only.
380
381temp[N]_max Maximum temperature.
382
383temp[N]_lcrit Critical low temperature.
384
385temp[N]_crit Critical high temperature.
386
387temp[N]_min_alarm Temperature low alarm.
388
389 LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
390 LTC2979, and LTM2987 only.
391
392temp[N]_max_alarm Temperature high alarm.
393
394
395temp[N]_lcrit_alarm Temperature critical low alarm.
396
397temp[N]_crit_alarm Temperature critical high alarm.
398
399temp[N]_lowest Lowest measured temperature.
400
401 - LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
402 LTC2979, and LTM2987 only.
403 - Not supported for chip temperature sensor on LTC2974
404 and LTC2975.
405
406temp[N]_highest Highest measured temperature.
407
408 Not supported for chip temperature sensor on
409 LTC2974 and LTC2975.
410
411temp[N]_reset_history Reset temperature history.
412
413 Not supported for chip temperature sensor on
414 LTC2974 and LTC2975.
415
416power1_label "pin". LTC3883 and LTC3886 only.
417
418power1_input Measured input power.
419
420power[N]_label "pout[1-4]".
421
422 - LTC2972: N=1-2
423 - LTC2974, LTC2975: N=1-4
424 - LTC2977, LTC2979, LTC2980, LTM2987: Not supported
425 - LTC2978: Not supported
426 - LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
427 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
428 LTM4700: N=1-2
429 - LTC3883: N=2
430
431power[N]_input Measured output power.
432
433curr1_label "iin".
434
435 LT7170, LT7171, LTC3880, LTC3883, LTC3884, LTC3886,
436 LTC3887, LTC3889, LTM4644, LTM4675, LTM4676, LTM4677,
437 LTM4678, LTM4680, and LTM4700 only.
438
439curr1_input Measured input current.
440
441curr1_max Maximum input current.
442
443curr1_max_alarm Input current high alarm.
444
445curr1_highest Highest input current.
446
447 LTC3883 and LTC3886 only.
448
449curr1_reset_history Reset input current history.
450
451 LTC3883 and LTC3886 only.
452
453curr[N]_label "iout[1-4]".
454
455 - LT7170, LT7171: N=1
456 - LTC2972: N-1-2
457 - LTC2974, LTC2975: N=1-4
458 - LTC2977, LTC2979, LTC2980, LTM2987: not supported
459 - LTC2978: not supported
460 - LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
461 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
462 LTM4700: N=2-3
463 - LTC3883: N=2
464 - LTC7841: N=2
465
466curr[N]_input Measured output current.
467
468curr[N]_max Maximum output current.
469
470curr[N]_crit Critical high output current.
471
472curr[N]_lcrit Critical low output current.
473
474 LTC2972, LTC2974 and LTC2975 only.
475
476curr[N]_max_alarm Output current high alarm.
477
478curr[N]_crit_alarm Output current critical high alarm.
479
480curr[N]_lcrit_alarm Output current critical low alarm.
481
482 LTC2972, LTC2974 and LTC2975 only.
483
484curr[N]_lowest Lowest output current.
485
486 LTC2972, LTC2974 and LTC2975 only.
487
488curr[N]_highest Highest output current.
489
490curr[N]_reset_history Reset output current history.
491======================= ========================================================