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1Kernel driver raspberrypi-hwmon2===============================3 4Supported boards:5 6 * Raspberry Pi A+ (via GPIO on SoC)7 * Raspberry Pi B+ (via GPIO on SoC)8 * Raspberry Pi 2 B (via GPIO on SoC)9 * Raspberry Pi 3 B (via GPIO on port expander)10 * Raspberry Pi 3 B+ (via PMIC)11 12Author: Stefan Wahren <stefan.wahren@i2se.com>13 14Description15-----------16 17This driver periodically polls a mailbox property of the VC4 firmware to detect18undervoltage conditions.19 20Sysfs entries21-------------22 23======================= ==================24in0_lcrit_alarm Undervoltage alarm25======================= ==================26