Kernel driver raspberrypi-hwmonÂķ

Supported boards:

  • Raspberry Pi A+ (via GPIO on SoC)

  • Raspberry Pi B+ (via GPIO on SoC)

  • Raspberry Pi 2 B (via GPIO on SoC)

  • Raspberry Pi 3 B (via GPIO on port expander)

  • Raspberry Pi 3 B+ (via PMIC)

Author: Stefan Wahren <stefan.wahren@i2se.com>

DescriptionÂķ

This driver periodically polls a mailbox property of the VC4 firmware to detect undervoltage conditions.

Sysfs entriesÂķ

in0_input

Core voltage in millivolts

in1_input

SDRAM controller voltage in millivolts

in2_input

SDRAM I/O voltage in millivolts

in3_input

SDRAM PHY voltage in millivolts

in0_label

“core”

in1_label

“sdram_c”

in2_label

“sdram_i”

in3_label

“sdram_p”

in0_lcrit_alarm

Undervoltage alarm

The voltage inputs and labels are only exposed if the firmware reports support for the corresponding voltage ID.