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

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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 <[email protected]>
Cc: Mian Yousaf Kaukab <[email protected]>
Cc: Alessandro Rubini <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Linus Walleij 2012-04-12 12:49:16 -07:00 • committed by Linus Torvalds
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);