Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

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+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 <stefan.wahren@i2se.com>
+
+Description
+-----------
+
+This driver periodically polls a mailbox property of the VC4 firmware to detect
+undervoltage conditions.
+
+Sysfs entries
+-------------
+
+======================= ==================
+in0_lcrit_alarm         Undervoltage alarm
+======================= ==================