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

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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7
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];
@ -595,6 +596,12 @@ static int __init ar7_register_devices(void)
ar7_wdt_res.end = ar7_wdt_res.start + 0x20;
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;