719af4f1a4
Using local caching in this driver had few benefits. It used cached values for two seconds and then re-read all registers from the chip even if the user only accessed a single attribute. On top of that, alarm attributes were stale for up to four seconds (the first status register read reports and clears an alarm, the second reports it cleared). Use regmap instead for caching. Do not re-read non-volatile registers, and do not cache volatile registers. As part of this change, handle register read and write address differences in regmap code. This is necessary to avoid problems with caching in the regmap core, and ultimately simplifies the code. Also, errors observed when reading from and writing to registers are no longer ignored. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.