dts / boards / soc: Add support for SiLabs Gecko watchdog

This commit adds the following:
- device tree bindings for Gecko watchdog driver
- EFM32PG SOC support for the watchdog driver
- EFM32PG board support for the watchdog driver
- DTS aliases for testing with default watchdog driver test

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

boards/arm/efm32pg_stk3402a/doc/index.rst

@@ -59,6 +59,8 @@ The efm32pg_stk3402a board configuration supports the following hardware feature
 +-----------+------------+-------------------------------------+
 | I2C       | on-chip    | i2c port-polling                    |
 +-----------+------------+-------------------------------------+
+| WATCHDOG  | on-chip    | watchdog                            |
++-----------+------------+-------------------------------------+
 
 The default configuration can be found in the defconfig file:
 

boards/arm/efm32pg_stk3402a/efm32pg_stk3402a.yaml

@@ -12,6 +12,7 @@ supported:
   - i2c
   - gpio
   - nvs
+  - watchdog
 testing:
   ignore_tags:
     - net

boards/arm/efm32pg_stk3402a/efm32pg_stk3402a_common.dtsi

@@ -13,6 +13,8 @@
 		zephyr,shell-uart = &usart0;
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
+		watchdog0 = &wdog0;
+		watchdog1 = &wdog1;
 	};
 
 	/* These aliases are provided for compatibility with samples */
@@ -84,6 +86,15 @@
 	status = "okay";
 };
 
+&wdog0 {
+	status = "okay";
+};
+
+&wdog1 {
+	status = "okay";
+};
+
+
 &flash0 {
 	/*
 	 * For more information, see:

dts/arm/silabs/efm32_jg_pg_12b.dtsi

@@ -202,6 +202,22 @@
 				gpio-controller;
 				#gpio-cells = <2>;
 			};
+
+			wdog0: wdog@40052000 {
+				compatible = "silabs,gecko-wdog";
+				reg = <0x40052000 0x2C>;
+				label = "WDOG0";
+				interrupts = <2 0>;
+				status = "disabled";
+			};
+
+			wdog1: wdog@40052400 {
+				compatible = "silabs,gecko-wdog";
+				reg = <0x40052400 0x2C>;
+				label = "WDOG1";
+				interrupts = <3 0>;
+				status = "disabled";
+			};
 		};
 	};
 };

dts/bindings/watchdog/silabs,gecko-wdog.yaml

@@ -0,0 +1,19 @@
+# Copyright (c) 2019 Interay Solutions B.V.
+# Copyright (c) Oane Kingma
+# SPDX-License-Identifier: Apache-2.0
+
+description: Silicon Labs Gecko Family Watchdog driver
+
+compatible: "silabs,gecko-wdog"
+
+include: base.yaml
+
+properties:
+    reg:
+      required: true
+
+    label:
+      required: true
+
+    interrupts:
+      required: true

soc/arm/silabs_exx32/efm32gg11b/dts_fixup.h

@@ -31,4 +31,7 @@
 
 #define DT_RTC_0_NAME			DT_INST_0_SILABS_GECKO_RTCC_LABEL
 
+#define DT_WDT_0_NAME			DT_INST_0_SILABS_GECKO_WDOG_LABEL
+#define DT_WDT_1_NAME			DT_INST_1_SILABS_GECKO_WDOG_LABEL
+
 /* End of SoC Level DTS fixup file */

soc/arm/silabs_exx32/efm32jg12b/dts_fixup.h

@@ -29,5 +29,7 @@
 #define DT_GPIO_GECKO_PORTJ_NAME	DT_SILABS_EFM32_GPIO_PORT_4000A1C0_LABEL
 #define DT_GPIO_GECKO_PORTK_NAME	DT_SILABS_EFM32_GPIO_PORT_4000A1F0_LABEL
 
+#define DT_WDT_0_NAME			DT_INST_0_SILABS_GECKO_WDOG_LABEL
+#define DT_WDT_1_NAME			DT_INST_1_SILABS_GECKO_WDOG_LABEL
 
 /* End of SoC Level DTS fixup file */

soc/arm/silabs_exx32/efm32pg12b/dts_fixup.h

@@ -29,4 +29,7 @@
 #define DT_GPIO_GECKO_PORTJ_NAME	DT_SILABS_EFM32_GPIO_PORT_4000A1C0_LABEL
 #define DT_GPIO_GECKO_PORTK_NAME	DT_SILABS_EFM32_GPIO_PORT_4000A1F0_LABEL
 
+#define DT_WDT_0_NAME			DT_INST_0_SILABS_GECKO_WDOG_LABEL
+#define DT_WDT_1_NAME			DT_INST_1_SILABS_GECKO_WDOG_LABEL
+
 /* End of SoC Level DTS fixup file */

soc/arm/silabs_exx32/efr32fg1p/dts_fixup.h

@@ -28,4 +28,6 @@
 #define DT_GPIO_GECKO_PORTE_NAME	DT_SILABS_EFR32XG1_GPIO_PORT_4000A0C0_LABEL
 #define DT_GPIO_GECKO_PORTF_NAME	DT_SILABS_EFR32XG1_GPIO_PORT_4000A0F0_LABEL
 
+#define DT_WDT_0_NAME			DT_INST_0_SILABS_GECKO_WDOG_LABEL
+
 /* End of SoC Level DTS fixup file */

soc/arm/silabs_exx32/efr32mg12p/dts_fixup.h

@@ -30,4 +30,7 @@
 #define DT_GPIO_GECKO_PORTJ_NAME	DT_SILABS_EFR32MG_GPIO_PORT_4000A1B0_LABEL
 #define DT_GPIO_GECKO_PORTK_NAME	DT_SILABS_EFR32MG_GPIO_PORT_4000A1E0_LABEL
 
+#define DT_WDT_0_NAME			DT_INST_0_SILABS_GECKO_WDOG_LABEL
+#define DT_WDT_1_NAME			DT_INST_1_SILABS_GECKO_WDOG_LABEL
+
 /* End of SoC Level DTS fixup file */