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The IP101GR is a 32-pin QFN package variant of the IP101G/IP101GA Ethernet PHY. Due to it's limited amount of pins the RXER (receive error) and INTR32 (interrupt) functions share pin 21. By default the PHY is configured to output the "receive error" status on pin 21. Depending on the board layout and requirements we may want to re-configure the PHY to output the interrupt signal there. The mode of pin 21 can be configured in the "Digital I/O Specific Control Register" (register 29), bit 2: - 0 = RXER function - 1 = INTR(32) function Depending on the devicetree configuration we will now: - change the mode to either ther RXER or INTR32 function - keep the SEL_INTR32 value set by the bootloader (default) if no configuration is provided (to ensure that we're not breaking existing boards) - error out if conflicting configuration is given (RXER and INTR32 mode are enabled at the same time) Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.