dt-bindings: rtc: Add Spreadtrum SC27xx RTC documentation

This patch adds the binding documentation for Spreadtrum SC27xx series
RTC device.

Signed-off-by: Baolin Wang <baolin.wang@spreadtrum.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
1 file changed