netdev - [net-next PATCH v3 3/5] phylink: Introduce phylink_fwnode_phy

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Date:   Tue,  5 May 2020 18:59:03 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        linux.cj@...il.com, Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Varun Sethi <V.Sethi@....com>,
        "Rajesh V . Bikkina" <rajesh.bikkina@....com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Diana Madalina Craciun <diana.craciun@....com>,
        netdev@...r.kernel.org, Marcin Wojtas <mw@...ihalf.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Makarand Pawagi <makarand.pawagi@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Pankaj Bansal <pankaj.bansal@....com>,
        Calvin Johnson <calvin.johnson@....nxp.com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: [net-next PATCH v3 3/5] phylink: Introduce phylink_fwnode_phy_connect()

Define phylink_fwnode_phy_connect() to connect phy specified by
a fwnode to a phylink instance.

Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
---

Changes in v3:
  remove NULL return check as it is invalid
  remove unused phylink_device_phy_connect()

Changes in v2:
  replace of_ and acpi_ code with generic fwnode to get phy-handle.

 drivers/net/phy/phylink.c | 48 +++++++++++++++++++++++++++++++++++++++
 include/linux/phylink.h   |  3 +++
 2 files changed, 51 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 0f23bec431c1..560d1069426c 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -961,6 +961,54 @@ int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
 }
 EXPORT_SYMBOL_GPL(phylink_connect_phy);
 
+/**
+ * phylink_fwnode_phy_connect() - connect the PHY specified in the fwnode.
+ * @pl: a pointer to a &struct phylink returned from phylink_create()
+ * @fwnode: a pointer to a &struct fwnode_handle.
+ * @flags: PHY-specific flags to communicate to the PHY device driver
+ *
+ * Connect the phy specified @fwnode to the phylink instance specified
+ * by @pl. Actions specified in phylink_connect_phy() will be
+ * performed.
+ *
+ * Returns 0 on success or a negative errno.
+ */
+int phylink_fwnode_phy_connect(struct phylink *pl,
+			       struct fwnode_handle *fwnode,
+			       u32 flags)
+{
+	struct fwnode_handle *phy_fwnode;
+	struct phy_device *phy_dev;
+	int ret = 0;
+
+	/* Fixed links and 802.3z are handled without needing a PHY */
+	if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
+	    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
+	     phy_interface_mode_is_8023z(pl->link_interface)))
+		return 0;
+
+	phy_fwnode = fwnode_get_phy_node(fwnode);
+	if ((IS_ERR(phy_fwnode)) && pl->cfg_link_an_mode == MLO_AN_PHY)
+		return -ENODEV;
+
+	phy_dev = fwnode_phy_find_device(phy_fwnode);
+	fwnode_handle_put(phy_fwnode);
+	if (!phy_dev)
+		return -ENODEV;
+
+	ret = phy_attach_direct(pl->netdev, phy_dev, flags,
+				pl->link_interface);
+	if (ret)
+		return ret;
+
+	ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
+	if (ret)
+		phy_detach(phy_dev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(phylink_fwnode_phy_connect);
+
 /**
  * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
  * @pl: a pointer to a &struct phylink returned from phylink_create()
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index cc5b452a184e..107fb0afc3bb 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -367,6 +367,9 @@ void phylink_add_pcs(struct phylink *, const struct phylink_pcs_ops *ops);
 void phylink_destroy(struct phylink *);
 
 int phylink_connect_phy(struct phylink *, struct phy_device *);
+int phylink_fwnode_phy_connect(struct phylink *pl,
+			       struct fwnode_handle *fwnode,
+			       u32 flags);
 int phylink_of_phy_connect(struct phylink *, struct device_node *, u32 flags);
 void phylink_disconnect_phy(struct phylink *);
 
-- 
2.17.1