Documentation/ABI/testing/sysfs-class-regulator

   1 What:           /sys/class/regulator/.../state
   2 Date:           April 2008
   3 KernelVersion:  2.6.26
   4 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
   5 Description:
   6                 Some regulator directories will contain a field called
   7                 state. This reports the regulator enable control, for
   8                 regulators which can report that input value.
   9
  10                 This will be one of the following strings:
  11
  12                 'enabled'
  13                 'disabled'
  14                 'unknown'
  15
  16                 'enabled' means the regulator output is ON and is supplying
  17                 power to the system (assuming no error prevents it).
  18
  19                 'disabled' means the regulator output is OFF and is not
  20                 supplying power to the system (unless some non-Linux
  21                 control has enabled it).
  22
  23                 'unknown' means software cannot determine the state, or
  24                 the reported state is invalid.
  25
  26                 NOTE: this field can be used in conjunction with microvolts
  27                 or microamps to determine configured regulator output levels.
  28
  29
  30 What:           /sys/class/regulator/.../status
  31 Description:
  32                 Some regulator directories will contain a field called
  33                 "status". This reports the current regulator status, for
  34                 regulators which can report that output value.
  35
  36                 This will be one of the following strings:
  37
  38                         off
  39                         on
  40                         error
  41                         fast
  42                         normal
  43                         idle
  44                         standby
  45
  46                 "off" means the regulator is not supplying power to the
  47                 system.
  48
  49                 "on" means the regulator is supplying power to the system,
  50                 and the regulator can't report a detailed operation mode.
  51
  52                 "error" indicates an out-of-regulation status such as being
  53                 disabled due to thermal shutdown, or voltage being unstable
  54                 because of problems with the input power supply.
  55
  56                 "fast", "normal", "idle", and "standby" are all detailed
  57                 regulator operation modes (described elsewhere).  They
  58                 imply "on", but provide more detail.
  59
  60                 Note that regulator status is a function of many inputs,
  61                 not limited to control inputs from Linux.  For example,
  62                 the actual load presented may trigger "error" status; or
  63                 a regulator may be enabled by another user, even though
  64                 Linux did not enable it.
  65
  66
  67 What:           /sys/class/regulator/.../type
  68 Date:           April 2008
  69 KernelVersion:  2.6.26
  70 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
  71 Description:
  72                 Each regulator directory will contain a field called
  73                 type. This holds the regulator type.
  74
  75                 This will be one of the following strings:
  76
  77                 'voltage'
  78                 'current'
  79                 'unknown'
  80
  81                 'voltage' means the regulator output voltage can be controlled
  82                 by software.
  83
  84                 'current' means the regulator output current limit can be
  85                 controlled by software.
  86
  87                 'unknown' means software cannot control either voltage or
  88                 current limit.
  89
  90
  91 What:           /sys/class/regulator/.../microvolts
  92 Date:           April 2008
  93 KernelVersion:  2.6.26
  94 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
  95 Description:
  96                 Some regulator directories will contain a field called
  97                 microvolts. This holds the regulator output voltage setting
  98                 measured in microvolts (i.e. E-6 Volts), for regulators
  99                 which can report the control input for voltage.
 100
 101                 NOTE: This value should not be used to determine the regulator
 102                 output voltage level as this value is the same regardless of
 103                 whether the regulator is enabled or disabled.
 104
 105
 106 What:           /sys/class/regulator/.../microamps
 107 Date:           April 2008
 108 KernelVersion:  2.6.26
 109 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 110 Description:
 111                 Some regulator directories will contain a field called
 112                 microamps. This holds the regulator output current limit
 113                 setting measured in microamps (i.e. E-6 Amps), for regulators
 114                 which can report the control input for a current limit.
 115
 116                 NOTE: This value should not be used to determine the regulator
 117                 output current level as this value is the same regardless of
 118                 whether the regulator is enabled or disabled.
 119
 120
 121 What:           /sys/class/regulator/.../opmode
 122 Date:           April 2008
 123 KernelVersion:  2.6.26
 124 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 125 Description:
 126                 Some regulator directories will contain a field called
 127                 opmode. This holds the current regulator operating mode,
 128                 for regulators which can report that control input value.
 129
 130                 The opmode value can be one of the following strings:
 131
 132                 'fast'
 133                 'normal'
 134                 'idle'
 135                 'standby'
 136                 'unknown'
 137
 138                 The modes are described in include/linux/regulator/consumer.h
 139
 140                 NOTE: This value should not be used to determine the regulator
 141                 output operating mode as this value is the same regardless of
 142                 whether the regulator is enabled or disabled.  A "status"
 143                 attribute may be available to determine the actual mode.
 144
 145
 146 What:           /sys/class/regulator/.../min_microvolts
 147 Date:           April 2008
 148 KernelVersion:  2.6.26
 149 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 150 Description:
 151                 Some regulator directories will contain a field called
 152                 min_microvolts. This holds the minimum safe working regulator
 153                 output voltage setting for this domain measured in microvolts,
 154                 for regulators which support voltage constraints.
 155
 156                 NOTE: this will return the string 'constraint not defined' if
 157                 the power domain has no min microvolts constraint defined by
 158                 platform code.
 159
 160
 161 What:           /sys/class/regulator/.../max_microvolts
 162 Date:           April 2008
 163 KernelVersion:  2.6.26
 164 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 165 Description:
 166                 Some regulator directories will contain a field called
 167                 max_microvolts. This holds the maximum safe working regulator
 168                 output voltage setting for this domain measured in microvolts,
 169                 for regulators which support voltage constraints.
 170
 171                 NOTE: this will return the string 'constraint not defined' if
 172                 the power domain has no max microvolts constraint defined by
 173                 platform code.
 174
 175
 176 What:           /sys/class/regulator/.../min_microamps
 177 Date:           April 2008
 178 KernelVersion:  2.6.26
 179 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 180 Description:
 181                 Some regulator directories will contain a field called
 182                 min_microamps. This holds the minimum safe working regulator
 183                 output current limit setting for this domain measured in
 184                 microamps, for regulators which support current constraints.
 185
 186                 NOTE: this will return the string 'constraint not defined' if
 187                 the power domain has no min microamps constraint defined by
 188                 platform code.
 189
 190
 191 What:           /sys/class/regulator/.../max_microamps
 192 Date:           April 2008
 193 KernelVersion:  2.6.26
 194 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 195 Description:
 196                 Some regulator directories will contain a field called
 197                 max_microamps. This holds the maximum safe working regulator
 198                 output current limit setting for this domain measured in
 199                 microamps, for regulators which support current constraints.
 200
 201                 NOTE: this will return the string 'constraint not defined' if
 202                 the power domain has no max microamps constraint defined by
 203                 platform code.
 204
 205
 206 What:           /sys/class/regulator/.../name
 207 Date:           October 2008
 208 KernelVersion:  2.6.28
 209 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 210 Description:
 211                 Each regulator directory will contain a field called
 212                 name. This holds a string identifying the regulator for
 213                 display purposes.
 214
 215                 NOTE: this will be empty if no suitable name is provided
 216                 by platform or regulator drivers.
 217
 218
 219 What:           /sys/class/regulator/.../num_users
 220 Date:           April 2008
 221 KernelVersion:  2.6.26
 222 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 223 Description:
 224                 Each regulator directory will contain a field called
 225                 num_users. This holds the number of consumer devices that
 226                 have called regulator_enable() on this regulator.
 227
 228
 229 What:           /sys/class/regulator/.../requested_microamps
 230 Date:           April 2008
 231 KernelVersion:  2.6.26
 232 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 233 Description:
 234                 Some regulator directories will contain a field called
 235                 requested_microamps. This holds the total requested load
 236                 current in microamps for this regulator from all its consumer
 237                 devices.
 238
 239
 240 What:           /sys/class/regulator/.../parent
 241 Date:           April 2008
 242 KernelVersion:  2.6.26
 243 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 244 Description:
 245                 Some regulator directories will contain a link called parent.
 246                 This points to the parent or supply regulator if one exists.
 247
 248 What:           /sys/class/regulator/.../suspend_mem_microvolts
 249 Date:           May 2008
 250 KernelVersion:  2.6.26
 251 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 252 Description:
 253                 Some regulator directories will contain a field called
 254                 suspend_mem_microvolts. This holds the regulator output
 255                 voltage setting for this domain measured in microvolts when
 256                 the system is suspended to memory, for voltage regulators
 257                 implementing suspend voltage configuration constraints.
 258
 259 What:           /sys/class/regulator/.../suspend_disk_microvolts
 260 Date:           May 2008
 261 KernelVersion:  2.6.26
 262 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 263 Description:
 264                 Some regulator directories will contain a field called
 265                 suspend_disk_microvolts. This holds the regulator output
 266                 voltage setting for this domain measured in microvolts when
 267                 the system is suspended to disk, for voltage regulators
 268                 implementing suspend voltage configuration constraints.
 269
 270 What:           /sys/class/regulator/.../suspend_standby_microvolts
 271 Date:           May 2008
 272 KernelVersion:  2.6.26
 273 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 274 Description:
 275                 Some regulator directories will contain a field called
 276                 suspend_standby_microvolts. This holds the regulator output
 277                 voltage setting for this domain measured in microvolts when
 278                 the system is suspended to standby, for voltage regulators
 279                 implementing suspend voltage configuration constraints.
 280
 281 What:           /sys/class/regulator/.../suspend_mem_mode
 282 Date:           May 2008
 283 KernelVersion:  2.6.26
 284 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 285 Description:
 286                 Some regulator directories will contain a field called
 287                 suspend_mem_mode. This holds the regulator operating mode
 288                 setting for this domain when the system is suspended to
 289                 memory, for regulators implementing suspend mode
 290                 configuration constraints.
 291
 292 What:           /sys/class/regulator/.../suspend_disk_mode
 293 Date:           May 2008
 294 KernelVersion:  2.6.26
 295 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 296 Description:
 297                 Some regulator directories will contain a field called
 298                 suspend_disk_mode. This holds the regulator operating mode
 299                 setting for this domain when the system is suspended to disk,
 300                 for regulators implementing suspend mode configuration
 301                 constraints.
 302
 303 What:           /sys/class/regulator/.../suspend_standby_mode
 304 Date:           May 2008
 305 KernelVersion:  2.6.26
 306 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 307 Description:
 308                 Some regulator directories will contain a field called
 309                 suspend_standby_mode. This holds the regulator operating mode
 310                 setting for this domain when the system is suspended to
 311                 standby, for regulators implementing suspend mode
 312                 configuration constraints.
 313
 314 What:           /sys/class/regulator/.../suspend_mem_state
 315 Date:           May 2008
 316 KernelVersion:  2.6.26
 317 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 318 Description:
 319                 Some regulator directories will contain a field called
 320                 suspend_mem_state. This holds the regulator operating state
 321                 when suspended to memory, for regulators implementing suspend
 322                 configuration constraints.
 323
 324                 This will be one of the same strings reported by
 325                 the "state" attribute.
 326
 327 What:           /sys/class/regulator/.../suspend_disk_state
 328 Date:           May 2008
 329 KernelVersion:  2.6.26
 330 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 331 Description:
 332                 Some regulator directories will contain a field called
 333                 suspend_disk_state. This holds the regulator operating state
 334                 when suspended to disk, for regulators implementing
 335                 suspend configuration constraints.
 336
 337                 This will be one of the same strings reported by
 338                 the "state" attribute.
 339
 340 What:           /sys/class/regulator/.../suspend_standby_state
 341 Date:           May 2008
 342 KernelVersion:  2.6.26
 343 Contact:        Liam Girdwood <lrg@slimlogic.co.uk>
 344 Description:
 345                 Some regulator directories will contain a field called
 346                 suspend_standby_state. This holds the regulator operating
 347                 state when suspended to standby, for regulators implementing
 348                 suspend configuration constraints.
 349
 350                 This will be one of the same strings reported by
 351                 the "state" attribute.