Documentation/hwmon/powr1220

   1 Kernel driver powr1220
   2 ==================
   3
   4 Supported chips:
   5   * Lattice POWR1220AT8
   6     Prefix: 'powr1220'
   7     Addresses scanned: none
   8     Datasheet: Publicly available at the Lattice website
   9                http://www.latticesemi.com/
  10
  11 Author: Scott Kanowitz <scott.kanowitz@gmail.com>
  12
  13 Description
  14 -----------
  15
  16 This driver supports the Lattice POWR1220AT8 chip. The POWR1220
  17 includes voltage monitoring for 14 inputs as well as trim settings
  18 for output voltages and GPIOs. This driver implements the voltage
  19 monitoring portion of the chip.
  20
  21 Voltages are sampled by a 12-bit ADC with a step size of 2 mV.
  22 An in-line attenuator allows measurements from 0 to 6 V. The
  23 attenuator is enabled or disabled depending on the setting of the
  24 input's max value. The driver will enable the attenuator for any
  25 value over the low measurement range maximum of 2 V.
  26
  27 The input naming convention is as follows:
  28
  29 driver name    pin name
  30 in0            VMON1
  31 in1            VMON2
  32 in2            VMON3
  33 in2            VMON4
  34 in4            VMON5
  35 in5            VMON6
  36 in6            VMON7
  37 in7            VMON8
  38 in8            VMON9
  39 in9            VMON10
  40 in10           VMON11
  41 in11           VMON12
  42 in12           VCCA
  43 in13           VCCINP
  44
  45 The ADC readings are updated on request with a minimum period of 1s.