Kernel driver powr1220

Supported chips:

  • Lattice POWR1220AT8

    Prefix: ‘powr1220’

    Addresses scanned: none

    Datasheet: Publicly available at the Lattice website

Author: Scott Kanowitz <>


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

The ADC readings are updated on request with a minimum period of 1s.