ARM: dts: mvebu: armada-39x: enable watchdog for all Armada-39x SoCs

The whole Armada 39x SoC family of processors has watchdog which can be
supported with existing driver.
Signed-off-by: NGrzegorz Jaszczyk <jaz@semihalf.com>
Reviewed-by: NLior Amsalem <alior@marvell.com>
Acked-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-39x.dtsi

@@ -298,6 +298,14 @@
 				clock-names = "nbclk", "fixed";
 			};
 
+			watchdog@20300 {
+				compatible = "marvell,armada-380-wdt";
+				reg = <0x20300 0x34>, <0x20704 0x4>,
+				      <0x18260 0x4>;
+				clocks = <&coreclk 2>, <&refclk>;
+				clock-names = "nbclk", "fixed";
+			};
+
 			cpurst@20800 {
 				compatible = "marvell,armada-370-cpu-reset";
 				reg = <0x20800 0x10>;
@@ -534,5 +542,12 @@
 			#clock-cells = <0>;
 			clock-frequency = <1000000000>;
 		};
+
+		/* 25 MHz reference crystal */
+		refclk: oscillator {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <25000000>;
+		};
 	};
 };