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Date: Thu, 24 Sep 2026 01:59:08 +0300 Message-ID: <20260923225909.1649267-1-f@lex.la> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Maxime, I have a board where one switch port can use either an SFP cage or a separate copper PHY, picked by a GPIO mux. I would like to know whether the PHY ports work is meant to cover it, and how to describe such a port in devicetree until then. The board is a Keenetic KN-1012 (MT7981B) with an MT7531 switch. Port 5 is a DSA user port, lan4, in 2500base-x. Its SerDes goes through a mux on GPIO 27 either to an SFP cage or to an Airoha EN8811H 2.5G copper PHY, one at a time. SFP presence is on GPIO 23. OpenWrt handles it downstream with two devicetree overlays. The copper one gives port 5 a phy-handle to the EN8811H. The SFP one gives it sfp = <&sfp1> and managed = "in-band-status". The mux is set by an OpenWrt-only gpio-export node, and a chainloaded U-Boot reads the SFP presence pin at each boot and picks the overlay. Changing media needs a reboot. The PHY ports code in net-next covers an SFP that the PHY drives itself, with marvell10g as the user. Here the choice sits between the SerDes on the MAC side and two separate media, a cage and a separate PHY. So my questions: 1. Is a MAC-side mux like this in scope for the PHY ports work? 2. If it is, what devicetree shape should a board use today so it does not have to change later? 3. If it is not, is describing a single medium the accepted way for now? I can test patches on this board. Writing the framework part is beyond what I can take on myself.