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[ Upstream commit d8f20383a2fc3a3844b08a4999cf0e81164a0e56 ] The x86 Android tablets on which quirks to skip looking for a matching UartSerialBus resource and instead unconditionally create a serial bus device (serdev) are necessary there are 2 sorts of serialports: ACPI enumerated highspeed designware UARTs, these are the ones which typcially need to be skipped since they need a serdev for the attached BT HCI. A PNP enumerated UART which is part of the PCU. So far the existing quirks have ignored this. But on the Lenovo Yoga Tablet 2 Pro 1380 models this is used for a custom fastcharging protocol. There is a Micro USB switch which can switch the USB data lines to this uart and then a 600 baud protocol is used to configure the charger for a voltage higher then 5V. Add a new ACPI_QUIRK_PNP_UART1_SKIP quirk type and set this for the existing entry for the Lenovo Yoga Tablet 2 830 / 1050 models. Note this will lead to unnecessarily also creating a serdev for the PCU UART on the 830 / 1050 which don't need this, but the UART is not used otherwise there so that is not a problem. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.