usb: musb: move clock handling to glue layer

musb core doesn't need to know about platform
specific details. So start moving clock
handling to platform glue layer and make
musb core agnostic about that.

Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/omap2430.c

@@ -40,6 +40,7 @@
 struct omap2430_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
+	struct clk		*clk;
 };
 
 static struct timer_list musb_idle_timer;
@@ -277,9 +278,6 @@ static int omap2430_musb_suspend(struct musb *musb)
 {
 	u32 l;
 
-	if (!musb->clock)
-		return 0;
-
 	/* in any role */
 	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 	l |= ENABLEFORCE;	/* enable MSTANDBY */
@@ -291,11 +289,6 @@ static int omap2430_musb_suspend(struct musb *musb)
 
 	otg_set_suspend(musb->xceiv, 1);
 
-	if (musb->set_clock)
-		musb->set_clock(musb->clock, 0);
-	else
-		clk_disable(musb->clock);
-
 	return 0;
 }
 
@@ -303,16 +296,8 @@ static int omap2430_musb_resume(struct musb *musb)
 {
 	u32 l;
 
-	if (!musb->clock)
-		return 0;
-
 	otg_set_suspend(musb->xceiv, 0);
 
-	if (musb->set_clock)
-		musb->set_clock(musb->clock, 1);
-	else
-		clk_enable(musb->clock);
-
 	l = musb_readl(musb->mregs, OTG_SYSCONFIG);
 	l &= ~ENABLEWAKEUP;	/* disable wakeup */
 	musb_writel(musb->mregs, OTG_SYSCONFIG, l);
@@ -356,6 +341,7 @@ static int __init omap2430_probe(struct platform_device *pdev)
 	struct musb_hdrc_platform_data	*pdata = pdev->dev.platform_data;
 	struct platform_device		*musb;
 	struct omap2430_glue		*glue;
+	struct clk			*clk;
 
 	int				ret = -ENOMEM;
 
@@ -371,12 +357,26 @@ static int __init omap2430_probe(struct platform_device *pdev)
 		goto err1;
 	}
 
+	clk = clk_get(&pdev->dev, "ick");
+	if (IS_ERR(clk)) {
+		dev_err(&pdev->dev, "failed to get clock\n");
+		ret = PTR_ERR(clk);
+		goto err2;
+	}
+
+	ret = clk_enable(clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to enable clock\n");
+		goto err3;
+	}
+
 	musb->dev.parent		= &pdev->dev;
 	musb->dev.dma_mask		= &omap2430_dmamask;
 	musb->dev.coherent_dma_mask	= omap2430_dmamask;
 
 	glue->dev			= &pdev->dev;
 	glue->musb			= musb;
+	glue->clk			= clk;
 
 	pdata->platform_ops		= &omap2430_ops;
 
@@ -386,23 +386,29 @@ static int __init omap2430_probe(struct platform_device *pdev)
 			pdev->num_resources);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add resources\n");
-		goto err2;
+		goto err4;
 	}
 
 	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add platform_data\n");
-		goto err2;
+		goto err4;
 	}
 
 	ret = platform_device_add(musb);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register musb device\n");
-		goto err2;
+		goto err4;
 	}
 
 	return 0;
 
+err4:
+	clk_disable(clk);
+
+err3:
+	clk_put(clk);
+
 err2:
 	platform_device_put(musb);
 
@@ -419,6 +425,8 @@ static int __exit omap2430_remove(struct platform_device *pdev)
 
 	platform_device_del(glue->musb);
 	platform_device_put(glue->musb);
+	clk_disable(glue->clk);
+	clk_put(glue->clk);
 	kfree(glue);
 
 	return 0;