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The integrated PCS supports 802.3z (BASE-X) modes when the Synopsys IP is coupled with an appropriate SerDes to provide the electrical interface. The PCS presents a TBI interface to the SerDes for this. Thus, the BASE-X related registers are only present when TBI mode is supported. dwmac-qcom-ethqos added support for using 2.5G with the integrated PCS by calling dwmac_ctrl_ane() directly. Add support for the following to the integrated PCS: - 1000BASE-X protocol unconditionally. - 2500BASE-X if the coupled SerDes supports 2.5G speed. - The above without autonegotiation. - If the PCS supports TBI, then optional BASE-X autonegotiation for each of the above. Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Link: https://patch.msgid.link/E1w2tPe-0000000DYAp-1qpV@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>