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The Realtek SerDes mode capabilities do not map 1:1 to the PHY_INTERFACE_MODE_* modes used in the kernel and passed to the PCS. For example, some PHY chips use the proprietary XSGMII mode for which there isn't an equivalent in the kernel, or HSGMII. In the past, this led to problems and confusion using kernel's XGMII to handle the XSGMII mode, and needed a downstream patch for HSGMII. They have been solved/worked around for now, but XSGMII is currently not implemented at all. And who knows what might come in the future. To make our life easier, introduce a dedicated internal representation of SerDes modes which differs from kernel's PHY_INTERFACE_MODE_*. This allows us to map "external" modes to different internal modes as needed instead of carrying the PHY_INTERFACE_MODE_* through the whole SerDes configuration code. The PCS driver needs to map PHY_INTERFACE_MODE_* to RTPCS_SDS_MODE_* in pcs_config, and the latter should be used as the only one. Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com> Link: https://github.com/openwrt/openwrt/pull/21146 Signed-off-by: Robert Marko <robimarko@gmail.com>