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Diffstat (limited to 'kernel/Documentation/hwmon/powr1220')
| -rw-r--r-- | kernel/Documentation/hwmon/powr1220 | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/Documentation/hwmon/powr1220 b/kernel/Documentation/hwmon/powr1220 new file mode 100644 index 000000000..21e44f71a --- /dev/null +++ b/kernel/Documentation/hwmon/powr1220 @@ -0,0 +1,45 @@ +Kernel driver powr1220 +================== + +Supported chips: + * Lattice POWR1220AT8 + Prefix: 'powr1220' + Addresses scanned: none + Datasheet: Publicly available at the Lattice website + http://www.latticesemi.com/ + +Author: Scott Kanowitz <scott.kanowitz@gmail.com> + +Description +----------- + +This driver supports the Lattice POWR1220AT8 chip. The POWR1220 +includes voltage monitoring for 14 inputs as well as trim settings +for output voltages and GPIOs. This driver implements the voltage +monitoring portion of the chip. + +Voltages are sampled by a 12-bit ADC with a step size of 2 mV. +An in-line attenuator allows measurements from 0 to 6 V. The +attenuator is enabled or disabled depending on the setting of the +input's max value. The driver will enable the attenuator for any +value over the low measurement range maximum of 2 V. + +The input naming convention is as follows: + +driver name pin name +in0 VMON1 +in1 VMON2 +in2 VMON3 +in2 VMON4 +in4 VMON5 +in5 VMON6 +in6 VMON7 +in7 VMON8 +in8 VMON9 +in9 VMON10 +in10 VMON11 +in11 VMON12 +in12 VCCA +in13 VCCINP + +The ADC readings are updated on request with a minimum period of 1s. |