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Add documentation describing how the NPCM watchdog driver reports reset causes through bootstatus on NPCM750 and NPCM845 systems. Document the reset flag mapping, the watchdog instance mapping for WDIOF_CARDRESET, and the NPCM750/NPCM845 latch handling. Also mention sysfs bootstatus reporting when watchdog sysfs support is enabled. Signed-off-by: Tomer Maimon <tmaimon77@gmail.com> Link: https://lore.kernel.org/r/20260706144828.3517631-3-tmaimon77@gmail.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>