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

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Date:	Wed,  4 Nov 2015 07:36:31 -0800
From:	Joshua Clayton <stillcompiling@...il.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Joshua Clayton <stillcompiling@...il.com>
Subject: [PATCH 0/9] rtc-2123: access the clock offset feature

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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