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c371d4491b
Accessing registers on the AXP288 is quite expensive, so we should avoid doing unnecessary accesses. The FG_LOW_CAP_REG never changes underneath us, so we only need to read it once. Devices with an AXP288 do not have user-replace (let alone hot-swappable) batteries and the only bit we care about in the PWR_OP_MODE register is the CHRG_STAT_BAT_PRESENT bit, so we can get away with only reading the PWR_OP_MODE register once too. Note that the FG_LOW_CAP_REG is not marked volatile in the regmap, so we were effectively already reading it once. This change makes this explicit, this is done as preparation of a further patch which moves all remaining register accesses in fuel_gauge_get_property() out of that function. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
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.