Documentation/ABI/testing/sysfs-class-devfreq

   1 What:           /sys/class/devfreq/.../
   2 Date:           September 2011
   3 Contact:        MyungJoo Ham <myungjoo.ham@samsung.com>
   4 Description:
   5                 Provide a place in sysfs for the devfreq objects.
   6                 This allows accessing various devfreq specific variables.
   7                 The name of devfreq object denoted as ... is same as the
   8                 name of device using devfreq.
   9
  10 What:           /sys/class/devfreq/.../governor
  11 Date:           September 2011
  12 Contact:        MyungJoo Ham <myungjoo.ham@samsung.com>
  13 Description:
  14                 The /sys/class/devfreq/.../governor shows the name of the
  15                 governor used by the corresponding devfreq object.
  16
  17 What:           /sys/class/devfreq/.../cur_freq
  18 Date:           September 2011
  19 Contact:        MyungJoo Ham <myungjoo.ham@samsung.com>
  20 Description:
  21                 The /sys/class/devfreq/.../cur_freq shows the current
  22                 frequency of the corresponding devfreq object.
  23
  24 What:           /sys/class/devfreq/.../central_polling
  25 Date:           September 2011
  26 Contact:        MyungJoo Ham <myungjoo.ham@samsung.com>
  27 Description:
  28                 The /sys/class/devfreq/.../central_polling shows whether
  29                 the devfreq ojbect is using devfreq-provided central
  30                 polling mechanism or not.
  31
  32 What:           /sys/class/devfreq/.../polling_interval
  33 Date:           September 2011
  34 Contact:        MyungJoo Ham <myungjoo.ham@samsung.com>
  35 Description:
  36                 The /sys/class/devfreq/.../polling_interval shows and sets
  37                 the requested polling interval of the corresponding devfreq
  38                 object. The values are represented in ms. If the value is
  39                 less than 1 jiffy, it is considered to be 0, which means
  40                 no polling. This value is meaningless if the governor is
  41                 not polling; thus. If the governor is not using
  42                 devfreq-provided central polling
  43                 (/sys/class/devfreq/.../central_polling is 0), this value
  44                 may be useless.
  45
  46 What:           /sys/class/devfreq/.../userspace/set_freq
  47 Date:           September 2011
  48 Contact:        MyungJoo Ham <myungjoo.ham@samsung.com>
  49 Description:
  50                 The /sys/class/devfreq/.../userspace/set_freq shows and
  51                 sets the requested frequency for the devfreq object if
  52                 userspace governor is in effect.