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pci1xxxx is a PCIe switch with a multi-function endpoint on one of its downstream ports. PIO function is one of the functions in the multi-function endpoint. PIO function combines a GPIO controller and also an interface to program pci1xxxx's OTP & EEPROM. This auxiliary bus driver is loaded for the PIO function and separate child devices are enumerated for GPIO controller and OTP/EEPROM interface. Signed-off-by: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com> Link: https://lore.kernel.org/r/20220824200047.150308-2-kumaravel.thiagarajan@microchip.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.