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authorKim, Milo <Milo.Kim@ti.com>2012-12-17 16:02:51 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:21 -0800
commit18c701a9dbe91768e1629f1aece9d50543b3abfa (patch)
treecdf878420aea8e3e9e5a655399c1eb2b7e1318ac
parent162a96ea4bc77ad8d553ea5de6300b6ed70d13e1 (diff)
drivers/rtc/rtc-tps65910.c: enable RTC power domain on initialization
Enabling RTC HW block depends on the default value of TPS65910 register. In some mode, RTC block is disabled by default.(eg. AM3517 Craneboard) In this case, RTC_PWDN(RTC power down) bit should be cleared to enable the RTC HW block. This patch also works in case that RTC block is active by default, because there is no side effect even if the bit is updated again. Tested on AM3517 Craneboard. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Acked-by: Venu Byravarasu <vbyravarasu@nvidia.com> Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Sivaram Nair <sivaramn@nvidia.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/rtc/rtc-tps65910.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-tps65910.c b/drivers/rtc/rtc-tps65910.c
index 687006f31727..22eb4ebfa1a6 100644
--- a/drivers/rtc/rtc-tps65910.c
+++ b/drivers/rtc/rtc-tps65910.c
@@ -247,6 +247,13 @@ static int __devinit tps65910_rtc_probe(struct platform_device *pdev)
return ret;
dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");
+
+ /* Enable RTC digital power domain */
+ ret = regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL,
+ DEVCTRL_RTC_PWDN_MASK, 0 << DEVCTRL_RTC_PWDN_SHIFT);
+ if (ret < 0)
+ return ret;
+
rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
if (ret < 0)