driver: net: ethernet: davinci_mdio: runtime PM support

Enabling runtime PM support for davinci mdio driver

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/davinci_mdio.c

@@ -34,6 +34,7 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
+#include <linux/pm_runtime.h>
 #include <linux/davinci_emac.h>
 
 /*
@@ -321,7 +322,9 @@ static int __devinit davinci_mdio_probe(struct platform_device *pdev)
 	snprintf(data->bus->id, MII_BUS_ID_SIZE, "%s-%x",
 		pdev->name, pdev->id);
 
-	data->clk = clk_get(dev, NULL);
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+	data->clk = clk_get(&pdev->dev, "fck");
 	if (IS_ERR(data->clk)) {
 		dev_err(dev, "failed to get device clock\n");
 		ret = PTR_ERR(data->clk);
@@ -329,8 +332,6 @@ static int __devinit davinci_mdio_probe(struct platform_device *pdev)
 		goto bail_out;
 	}
 
-	clk_enable(data->clk);
-
 	dev_set_drvdata(dev, data);
 	data->dev = dev;
 	spin_lock_init(&data->lock);
@@ -378,10 +379,10 @@ bail_out:
 	if (data->bus)
 		mdiobus_free(data->bus);
 
-	if (data->clk) {
-		clk_disable(data->clk);
+	if (data->clk)
 		clk_put(data->clk);
-	}
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
 
 	kfree(data);
 
@@ -396,10 +397,10 @@ static int __devexit davinci_mdio_remove(struct platform_device *pdev)
 	if (data->bus)
 		mdiobus_free(data->bus);
 
-	if (data->clk) {
-		clk_disable(data->clk);
+	if (data->clk)
 		clk_put(data->clk);
-	}
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
 
 	dev_set_drvdata(dev, NULL);
 
@@ -421,8 +422,7 @@ static int davinci_mdio_suspend(struct device *dev)
 	__raw_writel(ctrl, &data->regs->control);
 	wait_for_idle(data);
 
-	if (data->clk)
-		clk_disable(data->clk);
+	pm_runtime_put_sync(data->dev);
 
 	data->suspended = true;
 	spin_unlock(&data->lock);
@@ -436,8 +436,7 @@ static int davinci_mdio_resume(struct device *dev)
 	u32 ctrl;
 
 	spin_lock(&data->lock);
-	if (data->clk)
-		clk_enable(data->clk);
+	pm_runtime_put_sync(data->dev);
 
 	/* restart the scan state machine */
 	ctrl = __raw_readl(&data->regs->control);