netdev - [PATCH RFC net-next 1/3] net: phy: Add helpers to determine if PHY driver is generic

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Message-Id: <20181106232913.17216-2-f.fainelli@gmail.com>
Date:   Tue,  6 Nov 2018 15:29:11 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     andrew@...n.ch, rmk+kernel@...linux.org.uk, davem@...emloft.net,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH RFC net-next 1/3] net: phy: Add helpers to determine if PHY driver is generic

We are already checking in phy_detach() that the PHY driver is of
generic kind (1G or 10G) and we are going to make use of that in the SFP
layer as well for 1000BaseT SFP modules, so expose helper functions to
return that information.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/phy/phy_device.c | 34 ++++++++++++++++++++++++++++++++--
 include/linux/phy.h          |  3 +++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index ab33d1777132..15de7a3263bf 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1262,6 +1262,36 @@ struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
 }
 EXPORT_SYMBOL(phy_attach);
 
+static bool phy_driver_is_genphy_kind(struct phy_device *phydev,
+				      struct device_driver *driver)
+{
+	struct device *d = &phydev->mdio.dev;
+	bool ret = false;
+
+	if (!phydev->drv)
+		return ret;
+
+	get_device(d);
+	ret = d->driver == driver;
+	put_device(d);
+
+	return ret;
+}
+
+bool phy_driver_is_genphy(struct phy_device *phydev)
+{
+	return phy_driver_is_genphy_kind(phydev,
+					 &genphy_driver.mdiodrv.driver);
+}
+EXPORT_SYMBOL_GPL(phy_driver_is_genphy);
+
+bool phy_driver_is_genphy_10g(struct phy_device *phydev)
+{
+	return phy_driver_is_genphy_kind(phydev,
+					 &genphy_10g_driver.mdiodrv.driver);
+}
+EXPORT_SYMBOL_GPL(phy_driver_is_genphy_10g);
+
 /**
  * phy_detach - detach a PHY device from its network device
  * @phydev: target phy_device struct
@@ -1293,8 +1323,8 @@ void phy_detach(struct phy_device *phydev)
 	 * from the generic driver so that there's a chance a
 	 * real driver could be loaded
 	 */
-	if (phydev->mdio.dev.driver == &genphy_10g_driver.mdiodrv.driver ||
-	    phydev->mdio.dev.driver == &genphy_driver.mdiodrv.driver)
+	if (phy_driver_is_genphy(phydev) ||
+	    phy_driver_is_genphy_10g(phydev))
 		device_release_driver(&phydev->mdio.dev);
 
 	/*
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 3ea87f774a76..84a6c7efef60 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1192,4 +1192,7 @@ module_exit(phy_module_exit)
 #define module_phy_driver(__phy_drivers)				\
 	phy_module_driver(__phy_drivers, ARRAY_SIZE(__phy_drivers))
 
+bool phy_driver_is_genphy(struct phy_device *phydev);
+bool phy_driver_is_genphy_10g(struct phy_device *phydev);
+
 #endif /* __PHY_H */
-- 
2.17.1