Messages in this thread | | | From | Joshua Clayton <> | Subject | [PATCH 0/9] rtc-2123: access the clock offset feature | Date | Wed, 4 Nov 2015 07:36:31 -0800 |
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Greetings, 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(-)
-- 2.5.0
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