Documentation: watchdog: at91sam9_wdt: add clocks property
The watchdog has an input clock, the slow clock. It is required as it will not function without it. Reviewed-by: NGuenter Roeck <linux@roeck-us.net> Acked-by: NBoris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
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