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-rw-r--r--drivers/rtc/rtc-mv.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-mv.c b/drivers/rtc/rtc-mv.c
index 45f12dcd371..e0263d2005e 100644
--- a/drivers/rtc/rtc-mv.c
+++ b/drivers/rtc/rtc-mv.c
@@ -12,6 +12,7 @@
#include <linux/bcd.h>
#include <linux/io.h>
#include <linux/platform_device.h>
+#include <linux/delay.h>
#define RTC_TIME_REG_OFFS 0
@@ -119,6 +120,16 @@ static int __init mv_rtc_probe(struct platform_device *pdev)
return -EINVAL;
}
+ /* make sure it is actually functional */
+ if (rtc_time == 0x01000000) {
+ ssleep(1);
+ rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
+ if (rtc_time == 0x01000000) {
+ dev_err(&pdev->dev, "internal RTC not ticking\n");
+ return -ENODEV;
+ }
+ }
+
platform_set_drvdata(pdev, pdata);
pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
&mv_rtc_ops, THIS_MODULE);