drivers: watchdog: Add StarFive Watchdog driver

Add watchdog driver for the StarFive JH7100 and JH7110 SoC.

Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com>
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230314132437.121534-3-xingyu.wu@starfivetech.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

MAINTAINERS

@@ -19951,6 +19951,13 @@ S:	Supported
 F:	Documentation/devicetree/bindings/rng/starfive*
 F:	drivers/char/hw_random/jh7110-trng.c
 
+STARFIVE WATCHDOG DRIVER
+M:	Xingyu Wu <xingyu.wu@starfivetech.com>
+M:	Samin Guo <samin.guo@starfivetech.com>
+S:	Supported
+F:	Documentation/devicetree/bindings/watchdog/starfive*
+F:	drivers/watchdog/starfive-wdt.c
+
 STATIC BRANCH/CALL
 M:	Peter Zijlstra <peterz@infradead.org>
 M:	Josh Poimboeuf <jpoimboe@kernel.org>

drivers/watchdog/Kconfig

@@ -1999,6 +1999,17 @@ config WATCHDOG_RTAS
 	  To compile this driver as a module, choose M here. The module
 	  will be called wdrtas.
 
+# RISC-V Architecture
+
+config STARFIVE_WATCHDOG
+	tristate "StarFive Watchdog support"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	select WATCHDOG_CORE
+	default ARCH_STARFIVE
+	help
+	  Say Y here to support the watchdog of StarFive JH7100 and JH7110
+	  SoC. This driver can also be built as a module if choose M.
+
 # S390 Architecture
 
 config DIAG288_WATCHDOG

drivers/watchdog/Makefile

@@ -192,6 +192,9 @@ obj-$(CONFIG_MEN_A21_WDT) += mena21_wdt.o
 obj-$(CONFIG_PSERIES_WDT) += pseries-wdt.o
 obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o
 
+# RISC-V Architecture
+obj-$(CONFIG_STARFIVE_WATCHDOG) += starfive-wdt.o
+
 # S390 Architecture
 obj-$(CONFIG_DIAG288_WATCHDOG) += diag288_wdt.o