rtc: ftrtc010: let the core handle range

The current range handling is highly suspicious. Anyway, let the core
handle it.
The RTC has a 32 bit counter on top of days + hh:mm:ss registers.

Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-ftrtc010.c b/drivers/rtc/rtc-ftrtc010.c
index 2cdc78ffeb17..61f798c6101f 100644
--- a/drivers/rtc/rtc-ftrtc010.c
+++ b/drivers/rtc/rtc-ftrtc010.c
@@ -95,9 +95,6 @@ static int ftrtc010_rtc_set_time(struct device *dev, struct rtc_time *tm)
         u32 sec, min, hour, day, offset;
         timeu64_t time;
 
-        if (tm->tm_year >= 2148)        /* EPOCH Year + 179 */
-                return -EINVAL;
-
         time = rtc_tm_to_time64(tm);
 
         sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND);
@@ -120,6 +117,7 @@ static const struct rtc_class_ops ftrtc010_rtc_ops = {
 
 static int ftrtc010_rtc_probe(struct platform_device *pdev)
 {
+        u32 days, hour, min, sec;
         struct ftrtc010_rtc *rtc;
         struct device *dev = &pdev->dev;
         struct resource *res;
@@ -172,6 +170,15 @@ static int ftrtc010_rtc_probe(struct platform_device *pdev)
 
         rtc->rtc_dev->ops = &ftrtc010_rtc_ops;
 
+        sec  = readl(rtc->rtc_base + FTRTC010_RTC_SECOND);
+        min  = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE);
+        hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR);
+        days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS);
+
+        rtc->rtc_dev->range_min = (u64)days * 86400 + hour * 3600 +
+                                  min * 60 + sec;
+        rtc->rtc_dev->range_max = U32_MAX + rtc->rtc_dev->range_min;
+
         ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt,
                                IRQF_SHARED, pdev->name, dev);
         if (unlikely(ret))