1 Kernel driver ltc2978 1 Kernel driver ltc2978
2 ===================== 2 =====================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * Linear Technology LTC2972 6 * Linear Technology LTC2972
7 7
8 Prefix: 'ltc2972' 8 Prefix: 'ltc2972'
9 9
10 Addresses scanned: - 10 Addresses scanned: -
11 11
12 Datasheet: https://www.analog.com/en/produ 12 Datasheet: https://www.analog.com/en/products/ltc2972.html
13 13
14 * Linear Technology LTC2974 14 * Linear Technology LTC2974
15 15
16 Prefix: 'ltc2974' 16 Prefix: 'ltc2974'
17 17
18 Addresses scanned: - 18 Addresses scanned: -
19 19
20 Datasheet: https://www.analog.com/en/produ 20 Datasheet: https://www.analog.com/en/products/ltc2974
21 21
22 * Linear Technology LTC2975 22 * Linear Technology LTC2975
23 23
24 Prefix: 'ltc2975' 24 Prefix: 'ltc2975'
25 25
26 Addresses scanned: - 26 Addresses scanned: -
27 27
28 Datasheet: https://www.analog.com/en/produ 28 Datasheet: https://www.analog.com/en/products/ltc2975
29 29
30 * Linear Technology LTC2977 30 * Linear Technology LTC2977
31 31
32 Prefix: 'ltc2977' 32 Prefix: 'ltc2977'
33 33
34 Addresses scanned: - 34 Addresses scanned: -
35 35
36 Datasheet: https://www.analog.com/en/produ 36 Datasheet: https://www.analog.com/en/products/ltc2977
37 37
38 * Linear Technology LTC2978, LTC2978A 38 * Linear Technology LTC2978, LTC2978A
39 39
40 Prefix: 'ltc2978' 40 Prefix: 'ltc2978'
41 41
42 Addresses scanned: - 42 Addresses scanned: -
43 43
44 Datasheet: https://www.analog.com/en/produ 44 Datasheet: https://www.analog.com/en/products/ltc2978
45 45
46 https://www.analog.com/en/produ 46 https://www.analog.com/en/products/ltc2978a
47 47
48 * Linear Technology LTC2979 48 * Linear Technology LTC2979
49 49
50 Prefix: 'ltc2979' 50 Prefix: 'ltc2979'
51 51
52 Addresses scanned: - 52 Addresses scanned: -
53 53
54 Datasheet: https://www.analog.com/en/produ 54 Datasheet: https://www.analog.com/en/products/ltc2979
55 55
56 * Linear Technology LTC2980 56 * Linear Technology LTC2980
57 57
58 Prefix: 'ltc2980' 58 Prefix: 'ltc2980'
59 59
60 Addresses scanned: - 60 Addresses scanned: -
61 61
62 Datasheet: https://www.analog.com/en/produ 62 Datasheet: https://www.analog.com/en/products/ltc2980
63 63
64 * Linear Technology LTC3880 64 * Linear Technology LTC3880
65 65
66 Prefix: 'ltc3880' 66 Prefix: 'ltc3880'
67 67
68 Addresses scanned: - 68 Addresses scanned: -
69 69
70 Datasheet: https://www.analog.com/en/produ 70 Datasheet: https://www.analog.com/en/products/ltc3880
71 71
72 * Linear Technology LTC3882 72 * Linear Technology LTC3882
73 73
74 Prefix: 'ltc3882' 74 Prefix: 'ltc3882'
75 75
76 Addresses scanned: - 76 Addresses scanned: -
77 77
78 Datasheet: https://www.analog.com/en/produ 78 Datasheet: https://www.analog.com/en/products/ltc3882
79 79
80 * Linear Technology LTC3883 80 * Linear Technology LTC3883
81 81
82 Prefix: 'ltc3883' 82 Prefix: 'ltc3883'
83 83
84 Addresses scanned: - 84 Addresses scanned: -
85 85
86 Datasheet: https://www.analog.com/en/produ 86 Datasheet: https://www.analog.com/en/products/ltc3883
87 87
88 * Linear Technology LTC3884 88 * Linear Technology LTC3884
89 89
90 Prefix: 'ltc3884' 90 Prefix: 'ltc3884'
91 91
92 Addresses scanned: - 92 Addresses scanned: -
93 93
94 Datasheet: https://www.analog.com/en/produ 94 Datasheet: https://www.analog.com/en/products/ltc3884
95 95
96 * Linear Technology LTC3886 96 * Linear Technology LTC3886
97 97
98 Prefix: 'ltc3886' 98 Prefix: 'ltc3886'
99 99
100 Addresses scanned: - 100 Addresses scanned: -
101 101
102 Datasheet: https://www.analog.com/en/produ 102 Datasheet: https://www.analog.com/en/products/ltc3886
103 103
104 * Linear Technology LTC3887 104 * Linear Technology LTC3887
105 105
106 Prefix: 'ltc3887' 106 Prefix: 'ltc3887'
107 107
108 Addresses scanned: - 108 Addresses scanned: -
109 109
110 Datasheet: https://www.analog.com/en/produ 110 Datasheet: https://www.analog.com/en/products/ltc3887
111 111
112 * Linear Technology LTC3889 112 * Linear Technology LTC3889
113 113
114 Prefix: 'ltc3889' 114 Prefix: 'ltc3889'
115 115
116 Addresses scanned: - 116 Addresses scanned: -
117 117
118 Datasheet: https://www.analog.com/en/produ 118 Datasheet: https://www.analog.com/en/products/ltc3889
119 119
120 * Linear Technology LTC7880 120 * Linear Technology LTC7880
121 121
122 Prefix: 'ltc7880' 122 Prefix: 'ltc7880'
123 123
124 Addresses scanned: - 124 Addresses scanned: -
125 125
126 Datasheet: https://www.analog.com/en/produ 126 Datasheet: https://www.analog.com/en/products/ltc7880
127 127
128 * Linear Technology LTM2987 128 * Linear Technology LTM2987
129 129
130 Prefix: 'ltm2987' 130 Prefix: 'ltm2987'
131 131
132 Addresses scanned: - 132 Addresses scanned: -
133 133
134 Datasheet: https://www.analog.com/en/produ 134 Datasheet: https://www.analog.com/en/products/ltm2987
135 135
136 * Linear Technology LTM4644 136 * Linear Technology LTM4644
137 137
138 Prefix: 'ltm4644' 138 Prefix: 'ltm4644'
139 139
140 Addresses scanned: - 140 Addresses scanned: -
141 141
142 Datasheet: https://www.analog.com/en/produ 142 Datasheet: https://www.analog.com/en/products/ltm4644
143 143
144 * Linear Technology LTM4675 144 * Linear Technology LTM4675
145 145
146 Prefix: 'ltm4675' 146 Prefix: 'ltm4675'
147 147
148 Addresses scanned: - 148 Addresses scanned: -
149 149
150 Datasheet: https://www.analog.com/en/produ 150 Datasheet: https://www.analog.com/en/products/ltm4675
151 151
152 * Linear Technology LTM4676 152 * Linear Technology LTM4676
153 153
154 Prefix: 'ltm4676' 154 Prefix: 'ltm4676'
155 155
156 Addresses scanned: - 156 Addresses scanned: -
157 157
158 Datasheet: https://www.analog.com/en/produ 158 Datasheet: https://www.analog.com/en/products/ltm4676
159 159
160 * Linear Technology LTM4677 160 * Linear Technology LTM4677
161 161
162 Prefix: 'ltm4677' 162 Prefix: 'ltm4677'
163 163
164 Addresses scanned: - 164 Addresses scanned: -
165 165
166 Datasheet: https://www.analog.com/en/produ 166 Datasheet: https://www.analog.com/en/products/ltm4677
167 167
168 * Linear Technology LTM4678 168 * Linear Technology LTM4678
169 169
170 Prefix: 'ltm4678' 170 Prefix: 'ltm4678'
171 171
172 Addresses scanned: - 172 Addresses scanned: -
173 173
174 Datasheet: https://www.analog.com/en/produ 174 Datasheet: https://www.analog.com/en/products/ltm4678
175 175
176 * Analog Devices LTM4680 176 * Analog Devices LTM4680
177 177
178 Prefix: 'ltm4680' 178 Prefix: 'ltm4680'
179 179
180 Addresses scanned: - 180 Addresses scanned: -
181 181
182 Datasheet: https://www.analog.com/ltm4680 182 Datasheet: https://www.analog.com/ltm4680
183 183
184 * Analog Devices LTM4686 184 * Analog Devices LTM4686
185 185
186 Prefix: 'ltm4686' 186 Prefix: 'ltm4686'
187 187
188 Addresses scanned: - 188 Addresses scanned: -
189 189
190 Datasheet: https://www.analog.com/ltm4686 190 Datasheet: https://www.analog.com/ltm4686
191 191
192 * Analog Devices LTM4700 192 * Analog Devices LTM4700
193 193
194 Prefix: 'ltm4700' 194 Prefix: 'ltm4700'
195 195
196 Addresses scanned: - 196 Addresses scanned: -
197 197
198 Datasheet: https://www.analog.com/ltm4700 198 Datasheet: https://www.analog.com/ltm4700
199 199
200 200
201 201
202 Author: Guenter Roeck <linux@roeck-us.net> 202 Author: Guenter Roeck <linux@roeck-us.net>
203 203
204 204
205 Description 205 Description
206 ----------- 206 -----------
207 207
208 - LTC2974 and LTC2975 are quad digital power s 208 - LTC2974 and LTC2975 are quad digital power supply managers.
209 - LTC2978 is an octal power supply monitor. 209 - LTC2978 is an octal power supply monitor.
210 - LTC2977 is a pin compatible replacement for 210 - LTC2977 is a pin compatible replacement for LTC2978.
211 - LTC2980 is a 16-channel Power System Manager 211 - LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977
212 - in a single die. The chip is instantiated an 212 - in a single die. The chip is instantiated and reported as two separate chips
213 - on two different I2C bus addresses. 213 - on two different I2C bus addresses.
214 - LTC3880, LTC3882, LTC3886, and LTC3887 are d 214 - LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down
215 - DC/DC controllers. 215 - DC/DC controllers.
216 - LTC3883 is a single phase step-down DC/DC co 216 - LTC3883 is a single phase step-down DC/DC controller.
217 - LTM2987 is a 16-channel Power System Manager 217 - LTM2987 is a 16-channel Power System Manager with two LTC2977 plus
218 - additional components on a single die. The c 218 - additional components on a single die. The chip is instantiated and reported
219 - as two separate chips on two different I2C b 219 - as two separate chips on two different I2C bus addresses.
220 - LTM4675 is a dual 9A or single 18A μModule 220 - LTM4675 is a dual 9A or single 18A μModule regulator
221 - LTM4676 is a dual 13A or single 26A uModule 221 - LTM4676 is a dual 13A or single 26A uModule regulator.
222 - LTM4686 is a dual 10A or single 20A uModule 222 - LTM4686 is a dual 10A or single 20A uModule regulator.
223 223
224 224
225 Usage Notes 225 Usage Notes
226 ----------- 226 -----------
227 227
228 This driver does not probe for PMBus devices. 228 This driver does not probe for PMBus devices. You will have to instantiate
229 devices explicitly. 229 devices explicitly.
230 230
231 Example: the following commands will load the 231 Example: the following commands will load the driver for an LTC2978 at address
232 0x60 on I2C bus #1:: 232 0x60 on I2C bus #1::
233 233
234 # modprobe ltc2978 234 # modprobe ltc2978
235 # echo ltc2978 0x60 > /sys/bus/i2c/dev 235 # echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device
236 236
237 237
238 Sysfs attributes 238 Sysfs attributes
239 ---------------- 239 ----------------
240 240
241 ======================= ====================== 241 ======================= ========================================================
242 in1_label "vin" 242 in1_label "vin"
243 243
244 in1_input Measured input voltage 244 in1_input Measured input voltage.
245 245
246 in1_min Minimum input voltage. 246 in1_min Minimum input voltage.
247 247
248 in1_max Maximum input voltage. 248 in1_max Maximum input voltage.
249 249
250 LTC2974, LTC2975, LTC2 250 LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
251 LTC2979 and LTM2987 on 251 LTC2979 and LTM2987 only.
252 252
253 in1_lcrit Critical minimum input 253 in1_lcrit Critical minimum input voltage.
254 254
255 LTC2972, LTC2974, LTC2 255 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
256 LTC2979 and LTM2987 on 256 LTC2979 and LTM2987 only.
257 257
258 in1_crit Critical maximum input 258 in1_crit Critical maximum input voltage.
259 259
260 in1_min_alarm Input voltage low alar 260 in1_min_alarm Input voltage low alarm.
261 261
262 in1_max_alarm Input voltage high ala 262 in1_max_alarm Input voltage high alarm.
263 263
264 LTC2972, LTC2974, LTC2 264 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
265 LTC2979 and LTM2987 on 265 LTC2979 and LTM2987 only.
266 266
267 in1_lcrit_alarm Input voltage critical 267 in1_lcrit_alarm Input voltage critical low alarm.
268 268
269 LTC2972, LTC2974, LTC2 269 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
270 LTC2979 and LTM2987 on 270 LTC2979 and LTM2987 only.
271 271
272 in1_crit_alarm Input voltage critical 272 in1_crit_alarm Input voltage critical high alarm.
273 273
274 in1_lowest Lowest input voltage. 274 in1_lowest Lowest input voltage.
275 275
276 LTC2972, LTC2974, LTC2 276 LTC2972, LTC2974, LTC2975, LTC2977, LTC2980, LTC2978,
277 and LTM2987 only. 277 and LTM2987 only.
278 278
279 in1_highest Highest input voltage. 279 in1_highest Highest input voltage.
280 280
281 in1_reset_history Reset input voltage hi 281 in1_reset_history Reset input voltage history.
282 282
283 in[N]_label "vout[1-8]". 283 in[N]_label "vout[1-8]".
284 284
285 - LTC2972: N=2-3 285 - LTC2972: N=2-3
286 - LTC2974, LTC2975: N= 286 - LTC2974, LTC2975: N=2-5
287 - LTC2977, LTC2979, LT 287 - LTC2977, LTC2979, LTC2980, LTM2987: N=2-9
288 - LTC2978: N=2-9 288 - LTC2978: N=2-9
289 - LTC3880, LTC3882, LT 289 - LTC3880, LTC3882, LTC3884, LTC23886 LTC3887, LTC3889,
290 LTC7880, LTM4644, LT 290 LTC7880, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678,
291 LTM4680, LTM4700: N= 291 LTM4680, LTM4700: N=2-3
292 - LTC3883: N=2 292 - LTC3883: N=2
293 293
294 in[N]_input Measured output voltag 294 in[N]_input Measured output voltage.
295 295
296 in[N]_min Minimum output voltage 296 in[N]_min Minimum output voltage.
297 297
298 in[N]_max Maximum output voltage 298 in[N]_max Maximum output voltage.
299 299
300 in[N]_lcrit Critical minimum outpu 300 in[N]_lcrit Critical minimum output voltage.
301 301
302 in[N]_crit Critical maximum outpu 302 in[N]_crit Critical maximum output voltage.
303 303
304 in[N]_min_alarm Output voltage low ala 304 in[N]_min_alarm Output voltage low alarm.
305 305
306 in[N]_max_alarm Output voltage high al 306 in[N]_max_alarm Output voltage high alarm.
307 307
308 in[N]_lcrit_alarm Output voltage critica 308 in[N]_lcrit_alarm Output voltage critical low alarm.
309 309
310 in[N]_crit_alarm Output voltage critica 310 in[N]_crit_alarm Output voltage critical high alarm.
311 311
312 in[N]_lowest Lowest output voltage. 312 in[N]_lowest Lowest output voltage.
313 313
314 LTC2972, LTC2974, LTC2 314 LTC2972, LTC2974, LTC2975,and LTC2978 only.
315 315
316 in[N]_highest Highest output voltage 316 in[N]_highest Highest output voltage.
317 317
318 in[N]_reset_history Reset output voltage h 318 in[N]_reset_history Reset output voltage history.
319 319
320 temp[N]_input Measured temperature. 320 temp[N]_input Measured temperature.
321 321
322 - On LTC2972, temp[1-2 322 - On LTC2972, temp[1-2] report external temperatures,
323 and temp 3 reports t 323 and temp 3 reports the chip temperature.
324 - On LTC2974 and LTC29 324 - On LTC2974 and LTC2975, temp[1-4] report external
325 temperatures, and te 325 temperatures, and temp5 reports the chip temperature.
326 - On LTC2977, LTC2979, 326 - On LTC2977, LTC2979, LTC2980, LTC2978, and LTM2987,
327 only one temperature 327 only one temperature measurement is supported and
328 reports the chip tem 328 reports the chip temperature.
329 - On LTC3880, LTC3882, 329 - On LTC3880, LTC3882, LTC3886, LTC3887, LTC3889,
330 LTM4664, LTM4675, LT 330 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
331 and LTM4700, temp1 a 331 and LTM4700, temp1 and temp2 report external
332 temperatures, and te 332 temperatures, and temp3 reports the chip temperature.
333 - On LTC3883, temp1 re 333 - On LTC3883, temp1 reports an external temperature,
334 and temp2 reports th 334 and temp2 reports the chip temperature.
335 335
336 temp[N]_min Minimum temperature. !! 336 temp[N]_min Mimimum temperature.
337 337
338 LTC2972, LTC2974, LCT2 338 LTC2972, LTC2974, LCT2977, LTM2980, LTC2978,
339 LTC2979, and LTM2987 o 339 LTC2979, and LTM2987 only.
340 340
341 temp[N]_max Maximum temperature. 341 temp[N]_max Maximum temperature.
342 342
343 temp[N]_lcrit Critical low temperatu 343 temp[N]_lcrit Critical low temperature.
344 344
345 temp[N]_crit Critical high temperat 345 temp[N]_crit Critical high temperature.
346 346
347 temp[N]_min_alarm Temperature low alarm. 347 temp[N]_min_alarm Temperature low alarm.
348 348
349 LTC2972, LTC2974, LTC2 349 LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
350 LTC2979, and LTM2987 o 350 LTC2979, and LTM2987 only.
351 351
352 temp[N]_max_alarm Temperature high alarm 352 temp[N]_max_alarm Temperature high alarm.
353 353
354 354
355 temp[N]_lcrit_alarm Temperature critical l 355 temp[N]_lcrit_alarm Temperature critical low alarm.
356 356
357 temp[N]_crit_alarm Temperature critical h 357 temp[N]_crit_alarm Temperature critical high alarm.
358 358
359 temp[N]_lowest Lowest measured temper 359 temp[N]_lowest Lowest measured temperature.
360 360
361 - LTC2972, LTC2974, LT 361 - LTC2972, LTC2974, LTC2975, LTC2977, LTM2980, LTC2978,
362 LTC2979, and LTM2987 362 LTC2979, and LTM2987 only.
363 - Not supported for ch 363 - Not supported for chip temperature sensor on LTC2974
364 and LTC2975. 364 and LTC2975.
365 365
366 temp[N]_highest Highest measured tempe 366 temp[N]_highest Highest measured temperature.
367 367
368 Not supported for chip 368 Not supported for chip temperature sensor on
369 LTC2974 and LTC2975. 369 LTC2974 and LTC2975.
370 370
371 temp[N]_reset_history Reset temperature hist 371 temp[N]_reset_history Reset temperature history.
372 372
373 Not supported for chip 373 Not supported for chip temperature sensor on
374 LTC2974 and LTC2975. 374 LTC2974 and LTC2975.
375 375
376 power1_label "pin". LTC3883 and LTC 376 power1_label "pin". LTC3883 and LTC3886 only.
377 377
378 power1_input Measured input power. 378 power1_input Measured input power.
379 379
380 power[N]_label "pout[1-4]". 380 power[N]_label "pout[1-4]".
381 381
382 - LTC2972: N=1-2 382 - LTC2972: N=1-2
383 - LTC2974, LTC2975: N= 383 - LTC2974, LTC2975: N=1-4
384 - LTC2977, LTC2979, LT 384 - LTC2977, LTC2979, LTC2980, LTM2987: Not supported
385 - LTC2978: Not support 385 - LTC2978: Not supported
386 - LTC3880, LTC3882, LT 386 - LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
387 LTM4664, LTM4675, LT 387 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
388 LTM4700: N=1-2 388 LTM4700: N=1-2
389 - LTC3883: N=2 389 - LTC3883: N=2
390 390
391 power[N]_input Measured output power. 391 power[N]_input Measured output power.
392 392
393 curr1_label "iin". 393 curr1_label "iin".
394 394
395 LTC3880, LTC3883, LTC3 395 LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889,
396 LTM4644, LTM4675, LTM4 396 LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
397 and LTM4700 only. 397 and LTM4700 only.
398 398
399 curr1_input Measured input current 399 curr1_input Measured input current.
400 400
401 curr1_max Maximum input current. 401 curr1_max Maximum input current.
402 402
403 curr1_max_alarm Input current high ala 403 curr1_max_alarm Input current high alarm.
404 404
405 curr1_highest Highest input current. 405 curr1_highest Highest input current.
406 406
407 LTC3883 and LTC3886 on 407 LTC3883 and LTC3886 only.
408 408
409 curr1_reset_history Reset input current hi 409 curr1_reset_history Reset input current history.
410 410
411 LTC3883 and LTC3886 on 411 LTC3883 and LTC3886 only.
412 412
413 curr[N]_label "iout[1-4]". 413 curr[N]_label "iout[1-4]".
414 414
415 - LTC2972: N-1-2 415 - LTC2972: N-1-2
416 - LTC2974, LTC2975: N= 416 - LTC2974, LTC2975: N=1-4
417 - LTC2977, LTC2979, LT 417 - LTC2977, LTC2979, LTC2980, LTM2987: not supported
418 - LTC2978: not support 418 - LTC2978: not supported
419 - LTC3880, LTC3882, LT 419 - LTC3880, LTC3882, LTC3884, LTC3886, LTC3887, LTC3889,
420 LTM4664, LTM4675, LT 420 LTM4664, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
421 LTM4700: N=2-3 421 LTM4700: N=2-3
422 - LTC3883: N=2 422 - LTC3883: N=2
423 423
424 curr[N]_input Measured output curren 424 curr[N]_input Measured output current.
425 425
426 curr[N]_max Maximum output current 426 curr[N]_max Maximum output current.
427 427
428 curr[N]_crit Critical high output c 428 curr[N]_crit Critical high output current.
429 429
430 curr[N]_lcrit Critical low output cu 430 curr[N]_lcrit Critical low output current.
431 431
432 LTC2972, LTC2974 and L 432 LTC2972, LTC2974 and LTC2975 only.
433 433
434 curr[N]_max_alarm Output current high al 434 curr[N]_max_alarm Output current high alarm.
435 435
436 curr[N]_crit_alarm Output current critica 436 curr[N]_crit_alarm Output current critical high alarm.
437 437
438 curr[N]_lcrit_alarm Output current critica 438 curr[N]_lcrit_alarm Output current critical low alarm.
439 439
440 LTC2972, LTC2974 and L 440 LTC2972, LTC2974 and LTC2975 only.
441 441
442 curr[N]_lowest Lowest output current. 442 curr[N]_lowest Lowest output current.
443 443
444 LTC2972, LTC2974 and L 444 LTC2972, LTC2974 and LTC2975 only.
445 445
446 curr[N]_highest Highest output current 446 curr[N]_highest Highest output current.
447 447
448 curr[N]_reset_history Reset output current h 448 curr[N]_reset_history Reset output current history.
449 ======================= ====================== 449 ======================= ========================================================
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