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From: Hebbar <gururajakr@sanyo.co.in>
To: linux-kernel@vger.kernel.org
Subject: need help to enable ARM AMBA PL031 RTC
Date: Tue, 15 Jul 2008 03:43:14 -0700 (PDT)	[thread overview]
Message-ID: <18462244.post@talk.nabble.com> (raw)


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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             reply	other threads:[~2008-07-15 10:43 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-15 10:43 Hebbar [this message]
2008-07-15 10:47 ` Ben Dooks

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