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kernel
os
linux
1Kernel driver ltc2978
2=====================
3
4Supported chips:
5
6 * Linear Technology LTC2972
7
8 Prefix: 'ltc2972'
9
10 Addresses scanned: -
11
12 Datasheet: https://www.analog.com/en/products/ltc2972.html
13
14 * Linear Technology LTC2974
15
16 Prefix: 'ltc2974'
17
18 Addresses scanned: -
19
20 Datasheet: https://www.analog.com/en/products/ltc2974
21
22 * Linear Technology LTC2975
23
24 Prefix: 'ltc2975'
25
26 Addresses scanned: -
27
28 Datasheet: https://www.analog.com/en/products/ltc2975
29
30 * Linear Technology LTC2977
31
32 Prefix: 'ltc2977'
33
34 Addresses scanned: -
35
36 Datasheet: https://www.analog.com/en/products/ltc2977
37
38 * Linear Technology LTC2978, LTC2978A
39
40 Prefix: 'ltc2978'
41
42 Addresses scanned: -
43
44 Datasheet: https://www.analog.com/en/products/ltc2978
45
46 https://www.analog.com/en/products/ltc2978a
47
48 * Linear Technology LTC2979
49
50 Prefix: 'ltc2979'
51
52 Addresses scanned: -
53
54 Datasheet: https://www.analog.com/en/products/ltc2979
55
56 * Linear Technology LTC2980
57
58 Prefix: 'ltc2980'
59
60 Addresses scanned: -
61
62 Datasheet: https://www.analog.com/en/products/ltc2980
63
64 * Linear Technology LTC3880
65
66 Prefix: 'ltc3880'
67
68 Addresses scanned: -
69
70 Datasheet: https://www.analog.com/en/products/ltc3880
71
72 * Linear Technology LTC3882
73
74 Prefix: 'ltc3882'
75
76 Addresses scanned: -
77
78 Datasheet: https://www.analog.com/en/products/ltc3882
79
80 * Linear Technology LTC3883
81
82 Prefix: 'ltc3883'
83
84 Addresses scanned: -
85
86 Datasheet: https://www.analog.com/en/products/ltc3883
87
88 * Linear Technology LTC3884
89
90 Prefix: 'ltc3884'
91
92 Addresses scanned: -
93
94 Datasheet: https://www.analog.com/en/products/ltc3884
95
96 * Linear Technology LTC3886
97
98 Prefix: 'ltc3886'
99
100 Addresses scanned: -
101
102 Datasheet: https://www.analog.com/en/products/ltc3886
103
104 * Linear Technology LTC3887
105
106 Prefix: 'ltc3887'
107
108 Addresses scanned: -
109
110 Datasheet: https://www.analog.com/en/products/ltc3887
111
112 * Linear Technology LTC3889
113
114 Prefix: 'ltc3889'
115
116 Addresses scanned: -
117
118 Datasheet: https://www.analog.com/en/products/ltc3889
119
120 * Linear Technology LTC7880
121
122 Prefix: 'ltc7880'
123
124 Addresses scanned: -
125
126 Datasheet: https://www.analog.com/en/products/ltc7880
127
128 * Linear Technology LTM2987
129
130 Prefix: 'ltm2987'
131
132 Addresses scanned: -
133
134 Datasheet: https://www.analog.com/en/products/ltm2987
135
136 * Linear Technology LTM4644
137
138 Prefix: 'ltm4644'
139
140 Addresses scanned: -
141
142 Datasheet: https://www.analog.com/en/products/ltm4644
143
144 * Linear Technology LTM4675
145
146 Prefix: 'ltm4675'
147
148 Addresses scanned: -
149
150 Datasheet: https://www.analog.com/en/products/ltm4675
151
152 * Linear Technology LTM4676
153
154 Prefix: 'ltm4676'
155
156 Addresses scanned: -
157
158 Datasheet: https://www.analog.com/en/products/ltm4676
159
160 * Linear Technology LTM4677
161
162 Prefix: 'ltm4677'
163
164 Addresses scanned: -
165
166 Datasheet: https://www.analog.com/en/products/ltm4677
167
168 * Linear Technology LTM4678
169
170 Prefix: 'ltm4678'
171
172 Addresses scanned: -
173
174 Datasheet: https://www.analog.com/en/products/ltm4678
175
176 * Analog Devices LTM4680
177
178 Prefix: 'ltm4680'
179
180 Addresses scanned: -
181
182 Datasheet: https://www.analog.com/ltm4680
183
184 * Analog Devices LTM4686
185
186 Prefix: 'ltm4686'
187
188 Addresses scanned: -
189
190 Datasheet: https://www.analog.com/ltm4686
191
192 * Analog Devices LTM4700
193
194 Prefix: 'ltm4700'
195
196 Addresses scanned: -
197
198 Datasheet: https://www.analog.com/ltm4700
199
200
201
202Author: Guenter Roeck <linux@roeck-us.net>
203
204
205Description
206-----------
207
208- LTC2974 and LTC2975 are quad digital power supply managers.
209- LTC2978 is an octal power supply monitor.
210- LTC2977 is a pin compatible replacement for LTC2978.
211- LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977
212- in a single die. The chip is instantiated and reported as two separate chips
213- on two different I2C bus addresses.
214- LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down
215- DC/DC controllers.
216- LTC3883 is a single phase step-down DC/DC controller.
217- LTM2987 is a 16-channel Power System Manager with two LTC2977 plus
218- additional components on a single die. The chip is instantiated and reported
219- as two separate chips on two different I2C bus addresses.
220- LTM4675 is a dual 9A or single 18A μModule regulator
221- LTM4676 is a dual 13A or single 26A uModule regulator.
222- LTM4686 is a dual 10A or single 20A uModule regulator.
223
224
225Usage Notes
226-----------
227
228This driver does not probe for PMBus devices. You will have to instantiate
229devices explicitly.
230
231Example: the following commands will load the driver for an LTC2978 at address
2320x60 on I2C bus #1::
233
234 # modprobe ltc2978
235 # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device
236
237
238Sysfs attributes
239----------------
240
241======================= ========================================================
242in1_label "vin"
243
244in1_input Measured input voltage.
245
246in1_min Minimum input voltage.
247
248in1_max Maximum input voltage.
249
250 LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
251 LTC2979 and LTM2987 only.
252
253in1_lcrit Critical minimum input voltage.
254
255 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
256 LTC2979 and LTM2987 only.
257
258in1_crit Critical maximum input voltage.
259
260in1_min_alarm Input voltage low alarm.
261
262in1_max_alarm Input voltage high alarm.
263
264 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
265 LTC2979 and LTM2987 only.
266
267in1_lcrit_alarm Input voltage critical low alarm.
268
269 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
270 LTC2979 and LTM2987 only.
271
272in1_crit_alarm Input voltage critical high alarm.
273
274in1_lowest Lowest input voltage.
275
276 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
277 and LTM2987 only.
278
279in1_highest Highest input voltage.
280
281in1_reset_history Reset input voltage history.
282
283in[N]_label "vout[1-8]".
284
285 - LTC2972: N=2-3
286 - LTC2974, LTC2975: N=2-5
287 - LTC2977, LTC2979, LTC2980, LTM2987: N=2-9
288 - LTC2978: N=2-9
289 - LTC3880, LTC3882, LTC3884, LTC23886 LTC3887, LTC3889,
290 LTC7880, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678,
291 LTM4680, LTM4700: N=2-3
292 - LTC3883: N=2
293
294in[N]_input Measured output voltage.
295
296in[N]_min Minimum output voltage.
297
298in[N]_max Maximum output voltage.
299
300in[N]_lcrit Critical minimum output voltage.
301
302in[N]_crit Critical maximum output voltage.
303
304in[N]_min_alarm Output voltage low alarm.
305
306in[N]_max_alarm Output voltage high alarm.
307
308in[N]_lcrit_alarm Output voltage critical low alarm.
309
310in[N]_crit_alarm Output voltage critical high alarm.
311
312in[N]_lowest Lowest output voltage.
313
314 LTC2972, LTC2974, LTC2975,and LTC2978 only.
315
316in[N]_highest Highest output voltage.
317
318in[N]_reset_history Reset output voltage history.
319
320temp[N]_input Measured temperature.
321
322 - On LTC2972, temp[1-2] report external temperatures,
323 and temp 3 reports the chip temperature.
324 - On LTC2974 and LTC2975, temp[1-4] report external
325 temperatures, and temp5 reports the chip temperature.
326 - On LTC2977, LTC2979, LTC2980, LTC2978, and LTM2987,
327 only one temperature measurement is supported and
328 reports the chip temperature.
329 - On LTC3880, LTC3882, LTC3886, LTC3887, LTC3889,
330 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
331 and LTM4700, temp1 and temp2 report external
332 temperatures, and temp3 reports the chip temperature.
333 - On LTC3883, temp1 reports an external temperature,
334 and temp2 reports the chip temperature.
335
336temp[N]_min Mimimum temperature.
337
338 LTC2972, LTC2974, LCT2977, LTM2980, LTC2978,
339 LTC2979, and LTM2987 only.
340
341temp[N]_max Maximum temperature.
342
343temp[N]_lcrit Critical low temperature.
344
345temp[N]_crit Critical high temperature.
346
347temp[N]_min_alarm Temperature low alarm.
348
349 LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
350 LTC2979, and LTM2987 only.
351
352temp[N]_max_alarm Temperature high alarm.
353
354
355temp[N]_lcrit_alarm Temperature critical low alarm.
356
357temp[N]_crit_alarm Temperature critical high alarm.
358
359temp[N]_lowest Lowest measured temperature.
360
361 - LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
362 LTC2979, and LTM2987 only.
363 - Not supported for chip temperature sensor on LTC2974
364 and LTC2975.
365
366temp[N]_highest Highest measured temperature.
367
368 Not supported for chip temperature sensor on
369 LTC2974 and LTC2975.
370
371temp[N]_reset_history Reset temperature history.
372
373 Not supported for chip temperature sensor on
374 LTC2974 and LTC2975.
375
376power1_label "pin". LTC3883 and LTC3886 only.
377
378power1_input Measured input power.
379
380power[N]_label "pout[1-4]".
381
382 - LTC2972: N=1-2
383 - LTC2974, LTC2975: N=1-4
384 - LTC2977, LTC2979, LTC2980, LTM2987: Not supported
385 - LTC2978: Not supported
386 - LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
387 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
388 LTM4700: N=1-2
389 - LTC3883: N=2
390
391power[N]_input Measured output power.
392
393curr1_label "iin".
394
395 LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889,
396 LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
397 and LTM4700 only.
398
399curr1_input Measured input current.
400
401curr1_max Maximum input current.
402
403curr1_max_alarm Input current high alarm.
404
405curr1_highest Highest input current.
406
407 LTC3883 and LTC3886 only.
408
409curr1_reset_history Reset input current history.
410
411 LTC3883 and LTC3886 only.
412
413curr[N]_label "iout[1-4]".
414
415 - LTC2972: N-1-2
416 - LTC2974, LTC2975: N=1-4
417 - LTC2977, LTC2979, LTC2980, LTM2987: not supported
418 - LTC2978: not supported
419 - LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
420 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
421 LTM4700: N=2-3
422 - LTC3883: N=2
423
424curr[N]_input Measured output current.
425
426curr[N]_max Maximum output current.
427
428curr[N]_crit Critical high output current.
429
430curr[N]_lcrit Critical low output current.
431
432 LTC2972, LTC2974 and LTC2975 only.
433
434curr[N]_max_alarm Output current high alarm.
435
436curr[N]_crit_alarm Output current critical high alarm.
437
438curr[N]_lcrit_alarm Output current critical low alarm.
439
440 LTC2972, LTC2974 and LTC2975 only.
441
442curr[N]_lowest Lowest output current.
443
444 LTC2972, LTC2974 and LTC2975 only.
445
446curr[N]_highest Highest output current.
447
448curr[N]_reset_history Reset output current history.
449======================= ========================================================