projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| f4ff4155 SK |
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. |