[net-next PATCH v1 1/2] device property: Introduce fwnode_phy_find_device()

From: Calvin Johnson <calvin.johnson@oss.nxp.com>
To: linux.cj@gmail.com, Jeremy Linton <jeremy.linton@arm.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Russell King - ARM Linux admin <linux@armlinux.org.uk>,
	Cristi Sovaiala <cristian.sovaiala@nxp.com>,
	Florin Laurentiu Chiculita <florinlaurentiu.chiculita@nxp.com>,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Madalin Bucur <madalin.bucur@oss.nxp.com>
Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com>,
	linux-acpi@vger.kernel.org,
	Diana Madalina Craciun <diana.craciun@nxp.com>,
	linux-arm-kernel@lists.infradead.org,
	Pankaj Bansal <pankaj.bansal@nxp.com>,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	Varun Sethi <V.Sethi@nxp.com>, Marcin Wojtas <mw@semihalf.com>,
	Makarand Pawagi <makarand.pawagi@nxp.com>,
	"Rajesh V . Bikkina" <rajesh.bikkina@nxp.com>,
	Calvin Johnson <calvin.johnson@oss.nxp.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [net-next PATCH v1 1/2] device property: Introduce fwnode_phy_find_device()
Date: Fri, 24 Apr 2020 08:46:16 +0530	[thread overview]
Message-ID: <20200424031617.24033-2-calvin.johnson@oss.nxp.com> (raw)
In-Reply-To: <20200424031617.24033-1-calvin.johnson@oss.nxp.com>

Define fwnode_phy_find_device() to iterate an mdiobus and find the
phy device of the provided phy fwnode.

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

 drivers/base/property.c  | 41 ++++++++++++++++++++++++++++++++++++++++
 include/linux/property.h |  5 +++++
 2 files changed, 46 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 5f35c0ccf5e0..7c0c14c800b7 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -870,6 +870,47 @@ int device_get_phy_mode(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(device_get_phy_mode);
 
+/**
+ * fwnode_phy_find_device - Give a phy fwnode to find the corresponding
+ * phy_device on the mdiobus.
+ * @phy_fwnode: Pointer to the phy's fwnode.
+ *
+ * If successful, returns a pointer to the phy_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure.
+ */
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode)
+{
+	struct device *d;
+	struct mdio_device *mdiodev;
+
+	if (!phy_fwnode)
+		return NULL;
+
+	d = bus_find_device_by_fwnode(&mdio_bus_type, phy_fwnode);
+	if (d) {
+		mdiodev = to_mdio_device(d);
+		if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
+			return to_phy_device(d);
+		put_device(d);
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(fwnode_phy_find_device);
+
+/**
+ * device_phy_find_device - For the given device, get the phy_device
+ * @dev: Pointer to the given device
+ *
+ * If successful, returns a pointer to the phy_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure.
+ */
+struct phy_device *device_phy_find_device(struct device *dev)
+{
+	return fwnode_phy_find_device(dev_fwnode(dev));
+}
+EXPORT_SYMBOL_GPL(device_phy_find_device);
+
 static void *fwnode_get_mac_addr(struct fwnode_handle *fwnode,
 				 const char *name, char *addr,
 				 int alen)
diff --git a/include/linux/property.h b/include/linux/property.h
index d86de017c689..236d656a2981 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -370,9 +370,14 @@ const void *device_get_match_data(struct device *dev);
 
 int device_get_phy_mode(struct device *dev);
 
+struct phy_device *device_phy_find_device(struct device *dev);
+
 void *device_get_mac_address(struct device *dev, char *addr, int alen);
 
 int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
+
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode);
+
 void *fwnode_get_mac_address(struct fwnode_handle *fwnode,
 			     char *addr, int alen);
 struct fwnode_handle *fwnode_graph_get_next_endpoint(
-- 
2.17.1

