rtc: rtc-sh: Correct sh_rtc_set_time() for some SH-3 parts.

Some SH-3 parts (SH7720 and SH7705 at least) need to have the
start bit explicitly cleared, as the reset is not enough. This
is safe across all parts, so simply clear the start bit in
the sh_rtc_set_time() path.

Signed-off-by: Markus Brunner <super.firetwister@gmail.com>
Signed-off by: Mark Jonas <toertel@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c
index e0f91dfce0f5..93ee05eeaeba 100644
--- a/drivers/rtc/rtc-sh.c
+++ b/drivers/rtc/rtc-sh.c
@@ -365,6 +365,7 @@ static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
         /* Reset pre-scaler & stop RTC */
         tmp = readb(rtc->regbase + RCR2);
         tmp |= RCR2_RESET;
+        tmp &= ~RCR2_START;
         writeb(tmp, rtc->regbase + RCR2);
 
         writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);