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docs: hwmon: htu31: document debugfs serial_number

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Document the debugfs serial_number file exposed by the htu31 driver.

The driver creates a debugfs entry for the sensor serial number, but
the documentation currently only describes the sysfs interface.

Signed-off-by: Chen-Shi-Hong <eric039eric@gmail.com>
Link: https://lore.kernel.org/r/20260517125320.2196-1-eric039eric@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Chen-Shi-Hong authored and Guenter Roeck committed 2026-06-09 08:23:00 -07:00
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Documentation/hwmon/htu31.rst
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@@ -35,3 +35,10 @@ temp1_input: temperature input
humidity1_input: humidity input
heater_enable: heater control
=================== =================
debugfs-Interface
-----------------
=================== =========================================
serial_number: unique serial number of the sensor
=================== =========================================