This patch checks if the watchdog enable bit is set in the DCL
register meaning that the hardware watchdog actually works and
if so, register the ar7_wdt platform_device.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
---

diff --git a/arch/mips/ar7/platform.c b/arch/mips/ar7/platform.c
index e2278c0..835f3f0 100644
--- a/arch/mips/ar7/platform.c
+++ b/arch/mips/ar7/platform.c

@@ -503,6 +503,7 @@ static int __init ar7_register_devices(void)

{
       u16 chip_id;
       int res;
+       u32 *bootcr, val;
#ifdef CONFIG_SERIAL_8250
       static struct uart_port uart_port[2];

@@ -595,7 +596,13 @@ static int __init ar7_register_devices(void)

       ar7_wdt_res.end = ar7_wdt_res.start + 0x20;

-       res = platform_device_register(&ar7_wdt);
+       bootcr = (u32 *)ioremap_nocache(AR7_REGS_DCL, 4);
+       val = *bootcr;
+       iounmap(bootcr);
+
+       /* Register watchdog only if enabled in hardware */
+       if (val & AR7_WDT_HW_ENA)
+               res = platform_device_register(&ar7_wdt);