27871359bd
On the SJA1110, the PCS of each SERDES-capable port is accessed through a different memory window which is 0x100 bytes in size, denoted by "pcs_base". In each PCS register access window, the XPCS MMDs are accessed in an indirect way: in pages/banks of up to 0x100 addresses each. Changing the page/bank is done by writing to a special register at the end of the access window. The MDIO register map accessed indirectly through the indirect banked method described above is similar to what SJA1105 has: upper 5 bits are the MMD, lower 16 bits are the MDIO address within that MMD. Since the PHY ID reported by the XPCS inside SJA1110 is also all zeroes (like SJA1105), we need to trap those reads and return a fake PHY ID so that the xpcs driver can apply some specific fixups for our integration. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.