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

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

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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