MIPS: ath79: add common watchdog device

All supported SoCs have a built-in hardware watchdog driver. This patch
registers a platform_device for that to make it usable.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: Luis R. Rodriguez <lrodriguez@atheros.com>
Cc: Cliff Holden <Cliff.Holden@Atheros.com>
Cc: Kathy Giori <Kathy.Giori@Atheros.com>
Patchwork: https://patchwork.linux-mips.org/patch/1955/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ath79/dev-common.c

@@ -65,3 +65,13 @@ void __init ath79_register_uart(void)
 	ath79_uart_data[0].uartclk = clk_get_rate(clk);
 	platform_device_register(&ath79_uart_device);
 }
+
+static struct platform_device ath79_wdt_device = {
+	.name		= "ath79-wdt",
+	.id		= -1,
+};
+
+void __init ath79_register_wdt(void)
+{
+	platform_device_register(&ath79_wdt_device);
+}

arch/mips/ath79/dev-common.h

@@ -13,5 +13,6 @@
 #define _ATH79_DEV_COMMON_H
 
 void ath79_register_uart(void);
+void ath79_register_wdt(void);
 
 #endif /* _ATH79_DEV_COMMON_H */

arch/mips/ath79/setup.c

@@ -186,6 +186,7 @@ static int __init ath79_setup(void)
 {
 	ath79_gpio_init();
 	ath79_register_uart();
+	ath79_register_wdt();
 
 	mips_machine_setup();