ARM: dts: r7s72100: Add watchdog timer

Add watchdog timer support for RZ/A1.
For the RZ/A1, the only way to do a reset is to overflow the WDT, so this
is useful even if you don't need the watchdog functionality.
Signed-off-by: NChris Brandt <chris.brandt@renesas.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r7s72100.dtsi

@@ -371,6 +371,13 @@
 			<0xe8202000 0x1000>;
 	};
 
+	wdt: watchdog@fcfe0000 {
+		compatible = "renesas,r7s72100-wdt", "renesas,rza-wdt";
+		reg = <0xfcfe0000 0x6>;
+		interrupts = <GIC_SPI 106 IRQ_TYPE_EDGE_RISING>;
+		clocks = <&p0_clk>;
+	};
+
 	i2c0: i2c@fcfee000 {
 		#address-cells = <1>;
 		#size-cells = <0>;