dt-bindings: watchdog: fsl-imx7ulp-wdt: Add 'fsl,ext-reset-output'

The wdog may generate wdog_any external reset if the int_en bit is
configured, so add a property for this purpose in dt-binding doc.

Signed-off-by: Jacky Bai <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
Acked-by: Rob Herring <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: JackyBai

Documentation/devicetree/bindings/watchdog/fsl-imx7ulp-wdt.yaml

@@ -30,6 +30,11 @@ properties:
   clocks:
     maxItems: 1
 
+  fsl,ext-reset-output:
+    description:
+      When set, wdog can generate external reset from the wdog_any pin.
+    type: boolean
+
 required:
   - compatible
   - interrupts