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MIPS: AR7: register watchdog device only if enabled in hw configuration

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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>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Florian Fainelli 2009-08-04 23:09:36 +02:00 committed by Ralf Baechle
parent 2cfac7f7f2
commit 72838a1703
2 changed files with 11 additions and 1 deletions
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9
arch/mips/ar7/platform.c
View File

@ -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);
return res;
}

3
arch/mips/include/asm/mach-ar7/ar7.h
View File

@ -78,6 +78,9 @@
#define AR7_REF_CLOCK 25000000
#define AR7_XTAL_CLOCK 24000000
/* DCL */
#define AR7_WDT_HW_ENA 0x10
struct plat_cpmac_data {
int reset_bit;
int power_bit;