of/mdio-gpio: Simplify the way device tree support is implemented.

This patch cleans up the way device tree support is added in mdio-gpio
driver. I found lot of code duplication which is not necessary.
Also strangely a new platform driver was also introduced for device tree
support. All this forced me to do this cleanup patch.
After this patch, the driver probe checks the of_node pointer to get the
data from device tree.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 92 deletions

diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
index 7189adf54bd1..899274f2f9b1 100644
--- a/drivers/net/phy/mdio-gpio.c
+++ b/drivers/net/phy/mdio-gpio.c
@@ -28,17 +28,38 @@
 #include <linux/gpio.h>
 #include <linux/mdio-gpio.h>
 
-#ifdef CONFIG_OF_GPIO
 #include <linux/of_gpio.h>
 #include <linux/of_mdio.h>
-#include <linux/of_platform.h>
-#endif
 
 struct mdio_gpio_info {
         struct mdiobb_ctrl ctrl;
         int mdc, mdio;
 };
 
+static void *mdio_gpio_of_get_data(struct platform_device *pdev)
+{
+        struct device_node *np = pdev->dev.of_node;
+        struct mdio_gpio_platform_data *pdata;
+        int ret;
+
+        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return NULL;
+
+        ret = of_get_gpio(np, 0);
+        if (ret < 0)
+                return NULL;
+
+        pdata->mdc = ret;
+
+        ret = of_get_gpio(np, 1);
+        if (ret < 0)
+                return NULL;
+        pdata->mdio = ret;
+
+        return pdata;
+}
+
 static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
 {
         struct mdio_gpio_info *bitbang =
@@ -162,10 +183,15 @@ static void __devexit mdio_gpio_bus_destroy(struct device *dev)
 
 static int __devinit mdio_gpio_probe(struct platform_device *pdev)
 {
-        struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
+        struct mdio_gpio_platform_data *pdata;
         struct mii_bus *new_bus;
         int ret;
 
+        if (pdev->dev.of_node)
+                pdata = mdio_gpio_of_get_data(pdev);
+        else
+                pdata = pdev->dev.platform_data;
+
         if (!pdata)
                 return -ENODEV;
 
@@ -173,7 +199,11 @@ static int __devinit mdio_gpio_probe(struct platform_device *pdev)
         if (!new_bus)
                 return -ENODEV;
 
-        ret = mdiobus_register(new_bus);
+        if (pdev->dev.of_node)
+                ret = of_mdiobus_register(new_bus, pdev->dev.of_node);
+        else
+                ret = mdiobus_register(new_bus);
+
         if (ret)
                 mdio_gpio_bus_deinit(&pdev->dev);
 
@@ -187,112 +217,30 @@ static int __devexit mdio_gpio_remove(struct platform_device *pdev)
         return 0;
 }
 
-#ifdef CONFIG_OF_GPIO
-
-static int __devinit mdio_ofgpio_probe(struct platform_device *ofdev)
-{
-        struct mdio_gpio_platform_data *pdata;
-        struct mii_bus *new_bus;
-        int ret;
-
-        pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
-        if (!pdata)
-                return -ENOMEM;
-
-        ret = of_get_gpio(ofdev->dev.of_node, 0);
-        if (ret < 0)
-                goto out_free;
-        pdata->mdc = ret;
-
-        ret = of_get_gpio(ofdev->dev.of_node, 1);
-        if (ret < 0)
-                goto out_free;
-        pdata->mdio = ret;
-
-        new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
-        if (!new_bus)
-                goto out_free;
-
-        ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
-        if (ret)
-                mdio_gpio_bus_deinit(&ofdev->dev);
-
-        return ret;
-
-out_free:
-        kfree(pdata);
-        return -ENODEV;
-}
-
-static int __devexit mdio_ofgpio_remove(struct platform_device *ofdev)
-{
-        mdio_gpio_bus_destroy(&ofdev->dev);
-        kfree(ofdev->dev.platform_data);
-
-        return 0;
-}
-
-static struct of_device_id mdio_ofgpio_match[] = {
-        {
-                .compatible = "virtual,mdio-gpio",
-        },
-        {},
-};
-MODULE_DEVICE_TABLE(of, mdio_ofgpio_match);
-
-static struct platform_driver mdio_ofgpio_driver = {
-        .driver = {
-                .name = "mdio-ofgpio",
-                .owner = THIS_MODULE,
-                .of_match_table = mdio_ofgpio_match,
-        },
-        .probe = mdio_ofgpio_probe,
-        .remove = __devexit_p(mdio_ofgpio_remove),
+static struct of_device_id mdio_gpio_of_match[] = {
+        { .compatible = "virtual,mdio-gpio", },
+        { /* sentinel */ }
 };
 
-static inline int __init mdio_ofgpio_init(void)
-{
-        return platform_driver_register(&mdio_ofgpio_driver);
-}
-
-static inline void mdio_ofgpio_exit(void)
-{
-        platform_driver_unregister(&mdio_ofgpio_driver);
-}
-#else
-static inline int __init mdio_ofgpio_init(void) { return 0; }
-static inline void mdio_ofgpio_exit(void) { }
-#endif /* CONFIG_OF_GPIO */
-
 static struct platform_driver mdio_gpio_driver = {
         .probe = mdio_gpio_probe,
         .remove = __devexit_p(mdio_gpio_remove),
         .driver         = {
                 .name   = "mdio-gpio",
                 .owner  = THIS_MODULE,
+                .of_match_table = mdio_gpio_of_match,
         },
 };
 
 static int __init mdio_gpio_init(void)
 {
-        int ret;
-
-        ret = mdio_ofgpio_init();
-        if (ret)
-                return ret;
-
-        ret = platform_driver_register(&mdio_gpio_driver);
-        if (ret)
-                mdio_ofgpio_exit();
-
-        return ret;
+        return platform_driver_register(&mdio_gpio_driver);
 }
 module_init(mdio_gpio_init);
 
 static void __exit mdio_gpio_exit(void)
 {
         platform_driver_unregister(&mdio_gpio_driver);
-        mdio_ofgpio_exit();
 }
 module_exit(mdio_gpio_exit);