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d54bf877fd
Some devices, such as the Lenovo Yoga Tab 3 Pro (YT3-X90F) have multiple batteries with a separate bq25890 charger for each battery. This requires some coordination between the chargers specifically the main charger needs to put the secondary charger in Hi-Z mode when: 1. Enabling its 5V boost (OTG) output to power an external USB device, to avoid the secondary charger IC seeing this as external Vbus and then trying to charge the secondary battery from this. 2. Talking the Pump Express protocol to increase the external Vbus voltage. Having the secondary charger drawing current when the main charger is trying to talk the Pump Express protocol results in the external Vbus voltage not being raised. Add a new "linux,secondary-charger-name" string device-property, which can be set to the power_supply class device's name of the secondary charger when there is a secondary charger; and make the Vbus regulator and Pump Express code put the secondary charger in Hi-Z mode when necessary. So far this new property is only used on x86/ACPI (non devicetree) devs, IOW it is not used in actual devicetree files. The devicetree-bindings maintainers have requested properties like these to not be added to the devicetree-bindings, so the new property is deliberately not added to the existing devicetree-bindings. Reviewed-by: Marek Vasut <marex@denx.de> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> |
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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.