0001 Kernel driver powr1220
0002 ======================
0003
0004 Supported chips:
0005
0006 * Lattice POWR1220AT8
0007
0008 Prefix: 'powr1220'
0009
0010 Addresses scanned: none
0011
0012 Datasheet: Publicly available at the Lattice website
0013
0014 http://www.latticesemi.com/
0015
0016 Author: Scott Kanowitz <scott.kanowitz@gmail.com>
0017
0018 Description
0019 -----------
0020
0021 This driver supports the Lattice POWR1220AT8 chip. The POWR1220
0022 includes voltage monitoring for 14 inputs as well as trim settings
0023 for output voltages and GPIOs. This driver implements the voltage
0024 monitoring portion of the chip.
0025
0026 Voltages are sampled by a 12-bit ADC with a step size of 2 mV.
0027 An in-line attenuator allows measurements from 0 to 6 V. The
0028 attenuator is enabled or disabled depending on the setting of the
0029 input's max value. The driver will enable the attenuator for any
0030 value over the low measurement range maximum of 2 V.
0031
0032 The input naming convention is as follows:
0033
0034 ============== ========
0035 driver name pin name
0036 ============== ========
0037 in0 VMON1
0038 in1 VMON2
0039 in2 VMON3
0040 in2 VMON4
0041 in4 VMON5
0042 in5 VMON6
0043 in6 VMON7
0044 in7 VMON8
0045 in8 VMON9
0046 in9 VMON10
0047 in10 VMON11
0048 in11 VMON12
0049 in12 VCCA
0050 in13 VCCINP
0051 ============== ========
0052
0053 The ADC readings are updated on request with a minimum period of 1s.
