linux-kernel - [PATCH 1/4 v3] net: mvmdio: allow platform device style registration

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Date:	Fri, 22 Mar 2013 14:39:25 +0100
From:	Florian Fainelli <florian@...nwrt.org>
To:	davem@...emloft.net
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Florian Fainelli <florian@...nwrt.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org
Subject: [PATCH 1/4 v3] net: mvmdio: allow platform device style registration

This patch changes the mvmdio driver not to use device tree
helper functions such as of_mdiobus_register() and of_iomap() so we can
instantiate this driver using a classic platform_device approach. Use
the device manager helper to ioremap() the base register cookie so we
get automatic freeing upon error and removal. This change is harmless
for Device Tree platforms because they will get the driver be registered
the same way as it was before.

Signed-off-by: Florian Fainelli <florian@...nwrt.org>
---
Changes since v2:
- use of_mdiobus_register if device tree node is available to ensure that
  all child PHY nodes get also registered (fixes PHY probing on DT-only)

Changes since v1:
- use device managed helpers to fix an ioremap leak in remove function
- remove the use of Device Tree specific helpers to allow platform-style
  registration

 drivers/net/ethernet/marvell/mvmdio.c |   22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
index 77b7c80..bbc5fde 100644
--- a/drivers/net/ethernet/marvell/mvmdio.c
+++ b/drivers/net/ethernet/marvell/mvmdio.c
@@ -24,10 +24,10 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/phy.h>
-#include <linux/of_address.h>
-#include <linux/of_mdio.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/of_mdio.h>
 
 #define MVMDIO_SMI_DATA_SHIFT              0
 #define MVMDIO_SMI_PHY_ADDR_SHIFT          16
@@ -143,11 +143,17 @@ static int orion_mdio_reset(struct mii_bus *bus)
 
 static int orion_mdio_probe(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
+	struct resource *r;
 	struct mii_bus *bus;
 	struct orion_mdio_dev *dev;
 	int i, ret;
 
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		dev_err(&pdev->dev, "No SMI register address given\n");
+		return -ENODEV;
+	}
+
 	bus = mdiobus_alloc_size(sizeof(struct orion_mdio_dev));
 	if (!bus) {
 		dev_err(&pdev->dev, "Cannot allocate MDIO bus\n");
@@ -172,9 +178,9 @@ static int orion_mdio_probe(struct platform_device *pdev)
 		bus->irq[i] = PHY_POLL;
 
 	dev = bus->priv;
-	dev->smireg = of_iomap(pdev->dev.of_node, 0);
+	dev->smireg = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 	if (!dev->smireg) {
-		dev_err(&pdev->dev, "No SMI register address given in DT\n");
+		dev_err(&pdev->dev, "Unable to remap SMI register\n");
 		kfree(bus->irq);
 		mdiobus_free(bus);
 		return -ENODEV;
@@ -182,10 +188,12 @@ static int orion_mdio_probe(struct platform_device *pdev)
 
 	mutex_init(&dev->lock);
 
-	ret = of_mdiobus_register(bus, np);
+	if (pdev->dev.of_node)
+		ret = of_mdiobus_register(bus, pdev->dev.of_node);
+	else
+		ret = mdiobus_register(bus);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);
-		iounmap(dev->smireg);
 		kfree(bus->irq);
 		mdiobus_free(bus);
 		return ret;
-- 
1.7.10.4

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