Kernel driver raspberrypi-hwmon

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 [email protected]

Description

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

Sysfs entries

======================= ====================================================== 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.