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The ADIN PHYs support automatic MDI/MDIX negotiation. By default this is disabled, so this is enabled at `config_init`. This is controlled via the PHY Control 1 register. The supported modes are: 1. Manual MDI 2. Manual MDIX 3. Auto MDIX - prefer MDIX 4. Auto MDIX - prefer MDI The phydev mdix & mdix_ctrl fields include modes 3 & 4 into a single auto-mode. So, the default mode this driver enables is 4 when Auto-MDI mode is used. When detecting MDI/MDIX mode, a combination of the PHY Control 1 register and PHY Status 1 register is used to determine the correct MDI/MDIX mode. If Auto-MDI mode is not set, then the manual MDI/MDIX mode is returned. If Auto-MDI mode is set, then MDIX mode is returned differs from the preferred MDI/MDIX mode. This covers all cases where: 1. MDI preferred & Pair01Swapped == MDIX 2. MDIX preferred & Pair01Swapped == MDI 3. MDI preferred & ! Pair01Swapped == MDIX 4. MDIX preferred & ! Pair01Swapped == MDI The preferred MDI/MDIX mode is not configured via SW, but can be configured via HW pins. Note that the `Pair01Swapped` is the Green-Yellow physical pairs. Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.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.