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From:   Calvin Johnson <calvin.johnson@oss.nxp.com>
To:     Jeremy Linton <jeremy.linton@arm.com>,
        Russell King - ARM Linux admin <linux@armlinux.org.uk>,
        Jon <jon@solid-run.com>,
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Cc:     netdev@vger.kernel.org, linux-acpi@vger.kernel.org,
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        Heiner Kallweit <hkallweit1@gmail.com>,
        Jakub Kicinski <kuba@kernel.org>, linux-kernel@vger.kernel.org
Subject: [net-next PATCH v2 1/3] net: phy: introduce find_phy_device()
Date:   Wed,  1 Jul 2020 11:42:31 +0530
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The PHYs on a mdiobus are probed and registered using mdiobus_register().
Later, for connecting these PHYs to MAC, the PHYs registered on the
mdiobus have to be referenced.

For each MAC node, a property "mdio-handle" is used to reference the
MDIO bus on which the PHYs are registered. On getting hold of the MDIO
bus, use find_phy_device() to get the PHY connected to the MAC.

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

Changes in v2: None

 drivers/net/phy/phy_device.c | 25 +++++++++++++++++++++++++
 include/linux/phy.h          |  1 +
 2 files changed, 26 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index eb1068a77ce1..417000197ab1 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -25,6 +25,7 @@
 #include <linux/netdevice.h>
 #include <linux/phy.h>
 #include <linux/phy_led_triggers.h>
+#include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/sfp.h>
 #include <linux/skbuff.h>
@@ -966,6 +967,30 @@ struct phy_device *phy_find_first(struct mii_bus *bus)
 }
 EXPORT_SYMBOL(phy_find_first);
 
+struct phy_device *find_phy_device(struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *fwnode_mdio;
+	struct platform_device *pdev;
+	struct mii_bus *mdio;
+	struct device *dev;
+	int addr;
+	int err;
+
+	fwnode_mdio = fwnode_find_reference(fwnode, "mdio-handle", 0);
+	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode_mdio);
+	if (IS_ERR_OR_NULL(dev))
+		return NULL;
+	pdev =  to_platform_device(dev);
+	mdio = platform_get_drvdata(pdev);
+
+	err = fwnode_property_read_u32(fwnode, "phy-channel", &addr);
+	if (err < 0 || addr < 0 || addr >= PHY_MAX_ADDR)
+		return NULL;
+
+	return mdiobus_get_phy(mdio, addr);
+}
+EXPORT_SYMBOL(find_phy_device);
+
 static void phy_link_change(struct phy_device *phydev, bool up)
 {
 	struct net_device *netdev = phydev->attached_dev;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 101a48fa6750..ef9d7ca5d7ba 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1245,6 +1245,7 @@ int phy_sfp_probe(struct phy_device *phydev,
 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
 			      phy_interface_t interface);
 struct phy_device *phy_find_first(struct mii_bus *bus);
+struct phy_device *find_phy_device(struct fwnode_handle *fwnode);
 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 		      u32 flags, phy_interface_t interface);
 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
-- 
2.17.1