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 <[e-mail]>
Signed-off-by: Imre Kaloz <[e-mail]>
Cc: [e-mail]
Cc: Luis R. Rodriguez <[e-mail]>
Cc: Cliff Holden <[e-mail]>
Cc: Kathy Giori <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/1955/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/ath79/dev-common.c

···
 	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

···
 #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

···
 {
 	ath79_gpio_init();
 	ath79_register_uart();
+	ath79_register_wdt();
 
 	mips_machine_setup();