rtc: s5m: limit endless loop waiting for register update
After setting alarm or time the driver is waiting for UDR register to be cleared indicating that registers data have been transferred. Limit the endless loop to only 5 retries. Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com> Reviewed-by: NMark Brown <broonie@linaro.org> Acked-by: NSangbeom Kim <sbkim73@samsung.com> Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Lee Jones <lee.jones@linaro.org> Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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