dt-bindings: watchdog: da9062: add suspend disable option

Document the watchdog disable option which can be used if the hardware
automatic suspend option is broken.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200108095704.23233-3-m.felsch@pengutronix.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/da9062-wdt.txt

@@ -6,6 +6,11 @@ Required properties:
 	"dlg,da9061-watchdog", "dlg,da9062-watchdog"
 	"dlg,da9062-watchdog"
 
+Optional properties:
+- dlg,use-sw-pm: Add this property to disable the watchdog during suspend.
+	Only use this option if you can't use the watchdog automatic suspend
+	function during a suspend (see register CONTROL_B).
+
 Example: DA9062
 
 	pmic0: da9062@58 {