linux-kernel - [PATCH v1 6/7] net: phylink: Introduce phylink_fwnode_phy

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Date:   Fri, 31 Jan 2020 21:04:39 +0530
From:   Calvin Johnson <calvin.johnson@....com>
To:     linux.cj@...il.com, Jon Nettleton <jon@...id-run.com>,
        linux@...linux.org.uk, Makarand Pawagi <makarand.pawagi@....com>,
        cristian.sovaiala@....com, laurentiu.tudor@....com,
        ioana.ciornei@....com, V.Sethi@....com, pankaj.bansal@....com,
        "Rajesh V . Bikkina" <rajesh.bikkina@....com>
Cc:     Calvin Johnson <calvin.johnson@....nxp.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v1 6/7] net: phylink: Introduce phylink_fwnode_phy_connect()

From: Calvin Johnson <calvin.johnson@....nxp.com>

Introduce phylink_fwnode_phy_connect API to connect the PHY using
fwnode.

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

 drivers/net/phy/phylink.c | 64 +++++++++++++++++++++++++++++++++++++++
 include/linux/phylink.h   |  2 ++
 2 files changed, 66 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index ee7a718662c6..f211f62283b5 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -18,6 +18,7 @@
 #include <linux/spinlock.h>
 #include <linux/timer.h>
 #include <linux/workqueue.h>
+#include <linux/acpi.h>
 
 #include "sfp.h"
 #include "swphy.h"
@@ -817,6 +818,69 @@ 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()
+ * @dn: a pointer to a &struct device_node.
+ * @flags: PHY-specific flags to communicate to the PHY device driver
+ *
+ * Connect the phy specified in the device node @dn 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_node;
+	struct phy_device *phy_dev;
+	int ret;
+	int status;
+	struct fwnode_reference_args args;
+
+	/* Fixed links and 802.3z are handled without needing a PHY */
+	if (pl->link_an_mode == MLO_AN_FIXED ||
+	    (pl->link_an_mode == MLO_AN_INBAND &&
+	     phy_interface_mode_is_8023z(pl->link_interface)))
+		return 0;
+
+	status = acpi_node_get_property_reference(fwnode, "phy-handle", 0,
+						  &args);
+	if (ACPI_FAILURE(status) || !is_acpi_device_node(args.fwnode))
+		status = acpi_node_get_property_reference(fwnode, "phy", 0,
+							  &args);
+	if (ACPI_FAILURE(status) || !is_acpi_device_node(args.fwnode))
+		status = acpi_node_get_property_reference(fwnode,
+							  "phy-device", 0,
+							  &args);
+
+	if (ACPI_FAILURE(status) || !is_acpi_device_node(args.fwnode)) {
+		if (pl->link_an_mode == MLO_AN_PHY)
+			return -ENODEV;
+		return 0;
+	}
+
+	phy_dev = fwnode_phy_find_device(args.fwnode);
+	if (phy_dev)
+		phy_attach_direct(pl->netdev, phy_dev, flags,
+				  pl->link_interface);
+
+	/* refcount is held by phy_attach_direct() on success */
+	put_device(&phy_dev->mdio.dev);
+
+	if (!phy_dev)
+		return -ENODEV;
+
+	ret = phylink_bringup_phy(pl, phy_dev);
+	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 fed5488e3c75..cb07cf7a832e 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -240,6 +240,8 @@ void phylink_destroy(struct phylink *);
 
 int phylink_connect_phy(struct phylink *, struct phy_device *);
 int phylink_of_phy_connect(struct phylink *, struct device_node *, u32 flags);
+int phylink_fwnode_phy_connect(struct phylink *pl, struct fwnode_handle *fwnode,
+			       u32 flags);
 void phylink_disconnect_phy(struct phylink *);
 int phylink_fixed_state_cb(struct phylink *,
 			   void (*cb)(struct net_device *dev,
-- 
2.17.1