[PATCH 0/9] rtc-2123: access the clock offset feature

From: Joshua Clayton
Date: Wed Nov 04 2015 - 10:38:31 EST

This series was prompted by a need to adjust the clock rate of the rtc
The existing code performs a soft reset during probe, which wipes out
several registers including the offset register, which performs adjustments
to the clock rate.

The first several patches are cleanup, with patch 5 and 6 avoiding the reset,
and patch 9 adding a nice sysfs interface to the clock offset.

I know that this is not the only rtc to provide a programmable clock offset
I wonder if this interface would make a good addition to the rtc api?

The rtc chips I have seen list their clock adjustments in parts per million.
I went with parts per billion, since the ppm listed was listed with a
fractional component.

Joshua Clayton (9):
rtc-pcf2123: Document all registers and useful bits
rtc-pcf2123: clean up reads from the chip
rtc-pcf2123: clean up writes to the rtc chip
rtc-pcf2123: replace magic numbers with defines
rtc-pcf2123: put the chip reset into a function
rtc-pcf2123: avoid resetting the clock if possible
rtc-pcf2123: allow sysfs to accept hexidecimal
rtc-pcf2123: use sysfs groups
rtc-pcf2123: adjust the clock rate via sysfs

drivers/rtc/rtc-pcf2123.c | 391 ++++++++++++++++++++++++++++++----------------
1 file changed, 257 insertions(+), 134 deletions(-)


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