The RTL9300 has an integrated watchdog. Add this to the devicetree.

This is taken from openwrt[1] the only difference is removing the
unnecessary second cell from the interrupts.

[1] - https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/realtek/dts/rtl930x.dtsi

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
---
 arch/mips/boot/dts/realtek/rtl930x.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/mips/boot/dts/realtek/rtl930x.dtsi b/arch/mips/boot/dts/realtek/rtl930x.dtsi
index 74b30704f188..77a854034aba 100644
--- a/arch/mips/boot/dts/realtek/rtl930x.dtsi
+++ b/arch/mips/boot/dts/realtek/rtl930x.dtsi
@@ -142,6 +142,20 @@ timer0: timer@3200 {
 			clocks = <&lx_clk>;
 		};
 
+		watchdog0: watchdog@3260 {
+			compatible = "realtek,rtl9300-wdt";
+			reg = <0x3260 0xc>;
+
+			realtek,reset-mode = "soc";
+
+			clocks = <&lx_clk>;
+			timeout-sec = <30>;
+
+			interrupt-parent = <&intc>;
+			interrupt-names = "phase1", "phase2";
+			interrupts = <5>, <6>;
+		};
+
 		snand: spi@1a400 {
 			compatible = "realtek,rtl9301-snand";
 			reg = <0x1a400 0x44>;
-- 
2.49.0