mmc: sdhci-dove: Prepare for common clock framework

As mach-dove is moving towards common clock framework prepare
the sdhci driver to grab its clock.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@googlemail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci-dove.c

@@ -20,11 +20,17 @@
  */
 
 #include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/module.h>
 #include <linux/mmc/host.h>
 
 #include "sdhci-pltfm.h"
 
+struct sdhci_dove_priv {
+	struct clk *clk;
+};
+
 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
 {
 	u16 ret;
@@ -72,11 +78,51 @@ static struct sdhci_pltfm_data sdhci_dove_pdata = {
 
 static int __devinit sdhci_dove_probe(struct platform_device *pdev)
 {
-	return sdhci_pltfm_register(pdev, &sdhci_dove_pdata);
+	struct sdhci_host *host;
+	struct sdhci_pltfm_host *pltfm_host;
+	struct sdhci_dove_priv *priv;
+	int ret;
+
+	ret = sdhci_pltfm_register(pdev, &sdhci_dove_pdata);
+	if (ret)
+		goto sdhci_dove_register_fail;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
+			    GFP_KERNEL);
+	if (!priv) {
+		dev_err(&pdev->dev, "unable to allocate private data");
+		ret = -ENOMEM;
+		goto sdhci_dove_allocate_fail;
+	}
+
+	host = platform_get_drvdata(pdev);
+	pltfm_host = sdhci_priv(host);
+	pltfm_host->priv = priv;
+
+	priv->clk = clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(priv->clk))
+		clk_prepare_enable(priv->clk);
+	return 0;
+
+sdhci_dove_allocate_fail:
+	sdhci_pltfm_unregister(pdev);
+sdhci_dove_register_fail:
+	return ret;
 }
 
 static int __devexit sdhci_dove_remove(struct platform_device *pdev)
 {
+	struct sdhci_host *host = platform_get_drvdata(pdev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_dove_priv *priv = pltfm_host->priv;
+
+	if (priv->clk) {
+		if (!IS_ERR(priv->clk)) {
+			clk_disable_unprepare(priv->clk);
+			clk_put(priv->clk);
+		}
+		devm_kfree(&pdev->dev, priv->clk);
+	}
 	return sdhci_pltfm_unregister(pdev);
 }