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drivers/rtc/rtc-pl031.c: enable clock on all ST variants 

The ST variants of the PL031 all require bit 26 in the control register
to be set before they work properly.  Discovered this when testing on
the Nomadik board where it would suprisingly just stand still.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Cc: Alessandro Rubini <rubini@unipv.it>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Walleij 2012-04-12 12:49:16 -07:00 committed by Linus Torvalds
parent 41c9308812
commit 2f39721683
1 changed files with 1 additions and 2 deletions
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3
drivers/rtc/rtc-pl031.c
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@ -339,8 +339,7 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
dev_dbg(&adev->dev, "revision = 0x%01x\n", ldata->hw_revision);
/* Enable the clockwatch on ST Variants */
if ((ldata->hw_designer == AMBA_VENDOR_ST) &&
(ldata->hw_revision > 1))
if (ldata->hw_designer == AMBA_VENDOR_ST)
writel(readl(ldata->base + RTC_CR) | RTC_CR_CWEN,
ldata->base + RTC_CR);