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73d246b440
The GPIO3 A4 pin on the ArmSoM Sige5 is routed to the 40-pin GPIO
header. This pin can serve a variety of functions, including ones of
questionable use to us on a GPIO header such as the 25MHz clock of the
ethernet controller.
Unfortunately, this is the precise function that it is being claimed for
by the gmac0 node in the Sige5 board dts, meaning it can't be used for
anything else despite serving no useful function in this role. Since it
goes through a RS0108 bidirectional voltage level translator with a
maximum data rate of 24Mbit/s in push-pull mode and 2Mbit/s data rate in
open-drain mode, it's doubtful as to whether the 25MHz clock signal
would even survive to the actual user-accessible pin it terminates in.
Remove it to leave the pin for users to play with. It's infinitely more
useful as a GPIO or even as a PWM.
Fixes:
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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 reStructuredText 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.