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NETC IP has only one external master MDIO interface (eMDIO) for managing the external PHYs. ENETC can use the interfaces provided by the EMDIO function or its port MDIO to access and manage its external PHY. Both the EMDIO function and the port MDIO are all virtual ports of the eMDIO. The difference is that the EMDIO function is a 'global port', it can access all the PHYs on the eMDIO, but port MDIO can only access its own PHY. To ensure that ENETC can only access its own PHY through port MDIO, LaBCR[MDIO_PHYAD_PRTAD] needs to be set, which represents the address of the external PHY connected to ENETC. If the accessed PHY address is not consistent with LaBCR[MDIO_PHYAD_PRTAD], then the MDIO access initiated by port MDIO will be invalid. Signed-off-by: Wei Fang <wei.fang@nxp.com> Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com> Link: https://patch.msgid.link/20251119102557.1041881-3-wei.fang@nxp.com Signed-off-by: Jakub Kicinski <kuba@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 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.