watchdog: add support for the Synopsys DesignWare WDT
The Synopsys DesignWare watchdog is found in several ARM based systems and provides a choice of 16 timeout periods depending on the clock input. The watchdog cannot be disabled once started. Signed-off-by: NJamie Iles <jamie@jamieiles.com> Acked-by: NViresh Kumar <viresh.kumar@st.com> Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
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drivers/watchdog/dw_wdt.c
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