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		Minimum 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======================= ========================================================
450