From nobody Mon Dec 1 22:05:59 2025 Received: from smtpout-02.galae.net (smtpout-02.galae.net [185.246.84.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1039F287258; Sat, 29 Nov 2025 08:23:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.84.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764404588; cv=none; b=hA6DJhktb0raCbBL/KQeMyyiTiYwKtWv93G7zD/2ZDlHZD0IqiSRm9zrRXsXS4tIId+3smqfo54Qna+gIZQC+SDX8QFM/SSA5HhaNU721EjQd4FHdTIlEEnopdCRILuxKJ7yF4o8XZNOkbEg6GBDOzAcSRVHnExx04xoiwGb5k8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764404588; c=relaxed/simple; bh=uY73RMamKmvlhHrTOo0BCRbm3/gl7jQUZ+1w8mvujww=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aVBBm0L1WvS0BTW46+mZgtckw2NxjrCoG9CsbZT9A/3dmWdWJY7oiB7w41PJkyQfwjF+0MQvo0sfLG8KlQ/II61m8fPQ16ckZqpjnvsXDx2JL+DYxnI1R/Svf9k1cML4m3jLnke4xPCBR34Oy15GC0lg0/fnOQp0BQp92+rZM34= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=bEJw7f0g; arc=none smtp.client-ip=185.246.84.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="bEJw7f0g" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id C81EC1A1E20; Sat, 29 Nov 2025 08:23:05 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 9B78A60706; Sat, 29 Nov 2025 08:23:05 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 3BAFE119104C8; Sat, 29 Nov 2025 09:23:01 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1764404584; h=from:subject:date:message-id:to:cc:mime-version: content-transfer-encoding:in-reply-to:references; bh=Msu0imgYjgEXqi/dF9uLIaxoW+p7JaMq0nG/Ijq7F94=; b=bEJw7f0gwbZMUBdDpllySk8eR9kb/r4NbTbYUbmb6wm5ufADS1IM0sIYQoiqxKtA/ZVxNE N9MZo41S9rib71cm6IY3tlmBDxZKC5sqq9PumwdMSruTHC9++rheg40tOAe6h3tgUGZkhr 1G7sbpMHhPu8sAp8sQVL4IJNJyi+islMpa1BJzFZ99qGeWoQpGOqBBX4vmZ7Da6NqHSK4l +VDCGAgLl1RN10+38od9Auv4wgUqg2DJEXSNVYWgHLIjhqFNLgpsx7tvFZ9kK+SGL+pUXW wxLA+fn76W99cW88yPVPjzelVC01icViEjO0+StZVfTna2GC0dNL2XtcmQ00Ow== From: Maxime Chevallier To: davem@davemloft.net Cc: Maxime Chevallier , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, thomas.petazzoni@bootlin.com, Andrew Lunn , Jakub Kicinski , Eric Dumazet , Paolo Abeni , Russell King , linux-arm-kernel@lists.infradead.org, Christophe Leroy , Herve Codina , Florian Fainelli , Heiner Kallweit , Vladimir Oltean , =?UTF-8?q?K=C3=B6ry=20Maincent?= , =?UTF-8?q?Marek=20Beh=C3=BAn?= , Oleksij Rempel , =?UTF-8?q?Nicol=C3=B2=20Veronese?= , Simon Horman , mwojtas@chromium.org, Antoine Tenart , devicetree@vger.kernel.org, Conor Dooley , Krzysztof Kozlowski , Rob Herring , Romain Gantois , Daniel Golle , Dimitri Fedrau , Tariq Toukan Subject: [PATCH net-next v21 07/14] net: phy: Introduce generic SFP handling for PHY drivers Date: Sat, 29 Nov 2025 09:22:19 +0100 Message-ID: <20251129082228.454678-8-maxime.chevallier@bootlin.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20251129082228.454678-1-maxime.chevallier@bootlin.com> References: <20251129082228.454678-1-maxime.chevallier@bootlin.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Last-TLS-Session-Version: TLSv1.3 Content-Type: text/plain; charset="utf-8" There are currently 4 PHY drivers that can drive downstream SFPs: marvell.c, marvell10g.c, at803x.c and marvell-88x2222.c. Most of the logic is boilerplate, either calling into generic phylib helpers (for SFP PHY attach, bus attach, etc.) or performing the same tasks with a bit of validation : - Getting the module's expected interface mode - Making sure the PHY supports it - Optionaly perform some configuration to make sure the PHY outputs the right mode This can be made more generic by leveraging the phy_port, and its configure_mii() callback which allows setting a port's interfaces when the port is a serdes. Introduce a generic PHY SFP support. If a driver doesn't probe the SFP bus itself, but an SFP phandle is found in devicetree/firmware, then the generic PHY SFP support will be used, relying on port ops. PHY driver need to : - Register a .attach_port() callback - When a serdes port is registered to the PHY, drivers must set port->interfaces to the set of PHY_INTERFACE_MODE the port can output - If the port has limitations regarding speed, duplex and aneg, the port can also fine-tune the final linkmodes that can be supported - The port may register a set of ops, including .configure_mii(), that will be called at module_insert time to adjust the interface based on the module detected. Reviewed-by: Christophe Leroy Reviewed-by: Andrew Lunn Tested-by: Christophe Leroy Signed-off-by: Maxime Chevallier --- drivers/net/phy/phy_device.c | 107 +++++++++++++++++++++++++++++++++++ include/linux/phy.h | 2 + include/linux/phy_port.h | 2 + 3 files changed, 111 insertions(+) diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index f9252d36df20..793c6e0260c8 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -1598,6 +1598,86 @@ void phy_sfp_detach(void *upstream, struct sfp_bus *= bus) } EXPORT_SYMBOL(phy_sfp_detach); =20 +static int phy_sfp_module_insert(void *upstream, const struct sfp_eeprom_i= d *id) +{ + __ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support); + struct phy_device *phydev =3D upstream; + const struct sfp_module_caps *caps; + struct phy_port *port; + + phy_interface_t iface; + + linkmode_zero(sfp_support); + + port =3D phy_get_sfp_port(phydev); + if (!port) + return -EINVAL; + + caps =3D sfp_get_module_caps(phydev->sfp_bus); + + linkmode_and(sfp_support, port->supported, caps->link_modes); + if (linkmode_empty(sfp_support)) { + dev_err(&phydev->mdio.dev, "incompatible SFP module inserted, no common = linkmode\n"); + return -EINVAL; + } + + iface =3D sfp_select_interface(phydev->sfp_bus, sfp_support); + if (iface =3D=3D PHY_INTERFACE_MODE_NA) { + dev_err(&phydev->mdio.dev, "PHY %s does not support the SFP module's req= uested MII interfaces\n", + phydev_name(phydev)); + return -EINVAL; + } + + if (phydev->n_ports =3D=3D 1) + phydev->port =3D caps->port; + + if (port->ops && port->ops->configure_mii) + return port->ops->configure_mii(port, true, iface); + + return 0; +} + +static void phy_sfp_module_remove(void *upstream) +{ + struct phy_device *phydev =3D upstream; + struct phy_port *port =3D phy_get_sfp_port(phydev); + + if (port && port->ops && port->ops->configure_mii) + port->ops->configure_mii(port, false, PHY_INTERFACE_MODE_NA); + + if (phydev->n_ports =3D=3D 1) + phydev->port =3D PORT_NONE; +} + +static void phy_sfp_link_up(void *upstream) +{ + struct phy_device *phydev =3D upstream; + struct phy_port *port =3D phy_get_sfp_port(phydev); + + if (port && port->ops && port->ops->link_up) + port->ops->link_up(port); +} + +static void phy_sfp_link_down(void *upstream) +{ + struct phy_device *phydev =3D upstream; + struct phy_port *port =3D phy_get_sfp_port(phydev); + + if (port && port->ops && port->ops->link_down) + port->ops->link_down(port); +} + +static const struct sfp_upstream_ops sfp_phydev_ops =3D { + .attach =3D phy_sfp_attach, + .detach =3D phy_sfp_detach, + .module_insert =3D phy_sfp_module_insert, + .module_remove =3D phy_sfp_module_remove, + .link_up =3D phy_sfp_link_up, + .link_down =3D phy_sfp_link_down, + .connect_phy =3D phy_sfp_connect_phy, + .disconnect_phy =3D phy_sfp_disconnect_phy, +}; + static int phy_add_port(struct phy_device *phydev, struct phy_port *port) { int ret =3D 0; @@ -1658,6 +1738,7 @@ static int phy_setup_sfp_port(struct phy_device *phyd= ev) * is a MII port. */ port->is_mii =3D true; + port->is_sfp =3D true; =20 ret =3D phy_add_port(phydev, port); if (ret) @@ -3502,6 +3583,13 @@ static int phy_setup_ports(struct phy_device *phydev) if (ret) return ret; =20 + /* Use generic SFP probing only if the driver didn't do so already */ + if (!phydev->sfp_bus) { + ret =3D phy_sfp_probe(phydev, &sfp_phydev_ops); + if (ret) + goto out; + } + if (phydev->n_ports < phydev->max_n_ports) { ret =3D phy_default_setup_single_port(phydev); if (ret) @@ -3537,6 +3625,25 @@ static int phy_setup_ports(struct phy_device *phydev) return ret; } =20 +/** + * phy_get_sfp_port() - Returns the first valid SFP port of a PHY + * @phydev: pointer to the PHY device to get the SFP port from + * + * Returns: The first active SFP (serdes) port of a PHY device, NULL if no= ne + * exist. + */ +struct phy_port *phy_get_sfp_port(struct phy_device *phydev) +{ + struct phy_port *port; + + list_for_each_entry(port, &phydev->ports, head) + if (port->active && port->is_sfp) + return port; + + return NULL; +} +EXPORT_SYMBOL_GPL(phy_get_sfp_port); + /** * fwnode_mdio_find_device - Given a fwnode, find the mdio_device * @fwnode: pointer to the mdio_device's fwnode diff --git a/include/linux/phy.h b/include/linux/phy.h index 40376883eb4c..d75db4a88786 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -2426,6 +2426,8 @@ int __phy_hwtstamp_set(struct phy_device *phydev, struct kernel_hwtstamp_config *config, struct netlink_ext_ack *extack); =20 +struct phy_port *phy_get_sfp_port(struct phy_device *phydev); + extern const struct bus_type mdio_bus_type; extern const struct class mdio_bus_class; =20 diff --git a/include/linux/phy_port.h b/include/linux/phy_port.h index ce0208fbccf7..550c3f4ab19f 100644 --- a/include/linux/phy_port.h +++ b/include/linux/phy_port.h @@ -49,6 +49,7 @@ struct phy_port_ops { * @active: Indicates if the port is currently part of the active link. * @is_mii: Indicates if this port is MII (Media Independent Interface), * or MDI (Media Dependent Interface). + * @is_sfp: Indicates if this port drives an SFP cage. */ struct phy_port { struct list_head head; @@ -67,6 +68,7 @@ struct phy_port { unsigned int not_described:1; unsigned int active:1; unsigned int is_mii:1; + unsigned int is_sfp:1; }; =20 struct phy_port *phy_port_alloc(void); --=20 2.49.0