watchdog: max77620: Add comment to clarify set_timeout procedure
Clarify why we need to ping the watchdog before changing the timeout by quoting the MAX77714 datasheet. Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Lee Jones <lee.jones@linaro.org>
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