rtc: pcf2127: provide ->read method
This simply consists of renaming the existing pcf2127_read_reg() helper to follow the naming of the other methods (i.e. pcf2127_rtc_<method name>) and changing the type of its "len" parameter. Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NHeiko Schocher <hs@denx.de> Signed-off-by: NRasmus Villemoes <rasmus.villemoes@prevas.dk>
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