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Documentation: power: rt9756: Document exported sysfs entries

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Document the settings exported by rt9756 charger driver through sysfs
entries:

- watchdog_timer
- operation_mode

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://patch.msgid.link/5138d4aa760d6ff81a5296cdf010a447056abce4.1761894605.git.cy_huang@richtek.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
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ChiYuan Huang 2025-10-31 15:19:35 +08:00 • committed by Sebastian Reichel
parent b6f0796d43
commit 1cda377985
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What: /sys/class/power_supply/rt9756-*/watchdog_timer
Date: Dec 2025
KernelVersion: 6.19
Contact: ChiYuan Huang <cy_huang@richtek.com>
Description:
This entry shows and sets the watchdog timer when rt9756 charger
operates in charging mode. When the timer expires, the device
will disable the charging. To prevent the timer expires, any
host communication can make the timer restarted.
Access: Read, Write
Valid values:
- 500, 1000, 5000, 30000, 40000, 80000, 128000 or 255000 (milliseconds),
- 0: disabled
What: /sys/class/power_supply/rt9756-*/operation_mode
Date: Dec 2025
KernelVersion: 6.19
Contact: ChiYuan Huang <cy_huang@richtek.com>
Description:
This entry shows and set the operation mode when rt9756 charger
operates in charging phase. If 'bypass' mode is used, internal
path will connect vbus directly to vbat. Else, default 'div2'
mode for the switch-cap charging.
Access: Read, Write
Valid values:
- 'bypass' or 'div2'