boards: efr32_slwstk6061a: Enable watchdog

This commit adds the following:
- EFR32FG1P SoC support for the watchdog
- efr32_slwstk6061a board support for the watchdog

Signed-off-by: Oane Kingma <o.kingma@interay.com>

boards/arm/efr32_slwstk6061a/doc/index.rst

@@ -71,6 +71,8 @@ The efr32_slwstk6061a board configuration supports the following hardware featur
 +-----------+------------+-------------------------------------+
 | SPI(M)    | on-chip    | spi port-polling                    |
 +-----------+------------+-------------------------------------+
+| WATCHDOG  | on-chip    | watchdog                            |
++-----------+------------+-------------------------------------+
 
 The default configuration can be found in the defconfig file:
 

boards/arm/efr32_slwstk6061a/efr32_slwstk6061a.dts

@@ -25,6 +25,7 @@
 		led1 = &led1;
 		sw0 = &button0;
 		sw1 = &button1;
+		watchdog0 = &wdog0;
 	};
 
 	leds {
@@ -101,6 +102,10 @@
 	status = "okay";
 };
 
+&wdog0 {
+	status = "okay";
+};
+
 &flash0 {
 	/*
 	 * If the chosen node has no zephyr,code-partition property, the

boards/arm/efr32_slwstk6061a/efr32_slwstk6061a.yaml

@@ -12,6 +12,7 @@ supported:
   - gpio
   - nvs
   - spi
+  - watchdog
 testing:
   ignore_tags:
     - net

dts/arm/silabs/efr32fg1p.dtsi

@@ -147,6 +147,14 @@
 				#gpio-cells = <2>;
 			};
 		};
+
+		wdog0: wdog@40052000 {
+			compatible = "silabs,gecko-wdog";
+			reg = <0x40052000 0x2C>;
+			label = "WDOG0";
+			interrupts = <2 0>;
+			status = "disabled";
+		};
 	};
 };