Support watchdog for Starfive JH7100 SOC

Signed-off-by: Samin Guo <samin.guo@starfivetech.com>
Signed-off-by: Walker Chen <walker.chen@starfivetech.com>

Author: WalkerChenL

arch/riscv/boot/dts/starfive/jh7100.dtsi

@@ -566,6 +566,20 @@
 			status = "disabled";
 		};
 
+		wdt: wdt@12480000 {
+			compatible = "starfive,si5-wdt";
+			reg = <0x0 0x12480000 0x0 0x10000>;
+			interrupts = <80>;
+			clocks = <&clkgen JH7100_CLK_WDT_CORE>,
+				 <&clkgen JH7100_CLK_WDTIMER_APB>;
+			clock-names = "wdt_coreclk", "wdtimer_apb";
+			clock-frequency = <50000000>;
+			resets = <&rstgen JH7100_RSTN_WDTIMER_APB>,
+				 <&rstgen JH7100_RSTN_WDT>;
+			reset-names = "wdtimer_apb", "wdt";
+			status = "okay";
+		};
+
 		ptc: pwm@12490000 {
 			compatible = "starfive,pwm0";
 			reg = <0x0 0x12490000 0x0 0x10000>;

arch/riscv/configs/visionfive_defconfig

@@ -132,6 +132,8 @@ CONFIG_THERMAL_NETLINK=y
 CONFIG_THERMAL_STATISTICS=y
 CONFIG_THERMAL_WRITABLE_TRIPS=y
 CONFIG_CPU_THERMAL=y
+CONFIG_WATCHDOG=y
+CONFIG_STARFIVE_WATCHDOG=y
 CONFIG_MFD_TPS65086=y
 CONFIG_DRM=y
 CONFIG_DRM_I2C_NXP_TDA998X=y

drivers/watchdog/Kconfig

@@ -2008,6 +2008,15 @@ config UML_WATCHDOG
 	tristate "UML watchdog"
 	depends on UML || COMPILE_TEST
 
+# RISCV Architecture
+
+config STARFIVE_WATCHDOG
+	tristate "StarFive Watchdog support"
+	depends on RISCV
+	select WATCHDOG_CORE
+	help
+	  Say Y here to support the starfive Si5 watchdog.
+
 #
 # ISA-based Watchdog Cards
 #

drivers/watchdog/Makefile

@@ -203,6 +203,9 @@ obj-$(CONFIG_WATCHDOG_SUN4V)		+= sun4v_wdt.o
 # Xen
 obj-$(CONFIG_XEN_WDT) += xen_wdt.o
 
+# RISCV Architecture
+obj-$(CONFIG_STARFIVE_WATCHDOG) += starfive-wdt.o
+
 # Architecture Independent
 obj-$(CONFIG_BD957XMUF_WATCHDOG) += bd9576_wdt.o
 obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o