I all,
I am working on customized arm versatile board and i am trying to use ARM
AMBA PL031 RTC.
i enabled CONFIG_RTC_DRV_PL031=y
But the date never changes or updates.
/ # cat /sys/class/rtc/rtc0/time
00:00:00
When i went through the Ref Manual of ARM AMBA PL031 RTC i found that we
need to enable or set high to RTC START bit (bit 0) in RTC Control Register
( 0x0C ).
but in rtc-pl031.c, RTC_START is no where set in RTC CONTROL Register.
I think we need to enable it in rtc_probe func after rtc_device_register
returns success.
#define RTC_CR_MIE (1 << 0)
__raw_writel(RTC_CR_MIE, ldata->base + RTC_CR);
Kindly Comment.
Regards
Gururaja
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On Tue, Jul 15, 2008 at 03:43:14AM -0700, Hebbar wrote:
>
> I all,
>
> I am working on customized arm versatile board and i am trying to use ARM
> AMBA PL031 RTC.
[email protected] is the right place to
discuss this, although I belive it is moderated for non-subscribers.
> i enabled CONFIG_RTC_DRV_PL031=y
>
> But the date never changes or updates.
>
> / # cat /sys/class/rtc/rtc0/time
> 00:00:00
>
> When i went through the Ref Manual of ARM AMBA PL031 RTC i found that we
> need to enable or set high to RTC START bit (bit 0) in RTC Control Register
> ( 0x0C ).
>
> but in rtc-pl031.c, RTC_START is no where set in RTC CONTROL Register.
>
> I think we need to enable it in rtc_probe func after rtc_device_register
> returns success.
>
> #define RTC_CR_MIE (1 << 0)
>
> __raw_writel(RTC_CR_MIE, ldata->base + RTC_CR);
>
> Kindly Comment.
>
> Regards
> Gururaja
>
>
> --
> View this message in context: http://www.nabble.com/need-help-to-enable-ARM-AMBA-PL031-RTC-tp18462244p18462244.html
> Sent from the linux-kernel mailing list archive at Nabble.com.
>
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--
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