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Now that stmmac's PCS support is much more simple - just a matter of configuring the control register - the basic conversion to phylink PCS support becomes straight forward. Create the infrastructure to setup a phylink_pcs instance for the integrated PCS: - add a struct stmmac_pcs to encapsulate the phylink_pcs structure, pointer to stmmac_priv, and the core-specific base address of the PCS registers. - modify stmmac_priv and stmmac_mac_select_pcs() to return the embedded phylink_pcs structure when setup and STMMAC_PCS_SGMII is in use, and move the comment from stmmac_hw_setup() to here. - create stmmac_pcs.c, which contains the phylink_pcs_ops structure, a dummy .pcs_get_state() method which always reports link-down, and .pcs_config() method, moving the call to stmmac_pcs_ctrl_ane() here, but without indirecting through the dwmac specific core code. The link-down behaviour mentioned above maintains the current behaviour when phylink is used with inband but without a PCS. This will ensure that the PCS control register is configured to the same settings as before, but will now happen when the netdev is opened or reusmed rather than only during probe time. However, this will be before the .fix_mac_speed() method is called, which is critical for the behaviour in dwmac-qcom-ethqos's ethqos_configure_sgmii() function to be maintained. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Tested-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Link: https://patch.msgid.link/E1v9P72-0000000AomR-3ro4@rmk-PC.armlinux.org.uk 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.