linux-kernel - Re: need help to enable ARM AMBA PL031 RTC

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Message-ID: <20080715104741.GF24620@fluff.org.uk>
Date:	Tue, 15 Jul 2008 11:47:41 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Hebbar <gururajakr@...yo.co.in>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: need help to enable ARM AMBA PL031 RTC

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.

linux-arm-kernel@...ts.arm.linux.org.uk 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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-- 
Ben (ben@...ff.org, http://www.fluff.org/)

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