[WATCHDOG] mv64x60_wdt: Support the WDIOF_MAGICCLOSE feature
Disallow disabling of the watchdog timer unless a particular character ('V') was recently written to the watchdog device. Signed-off-by: NDale Farnsworth <dale@farnsworth.org> Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
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