mfd: omap-usb-tll: Clean up clock handling

Every channel has a functional clock that is similarly named.
It makes sense to use a for loop to manage these clocks as OMAPs
can come with up to 3 channels.

Dynamically allocate and get channel clocks depending on the
number of clocks avaiable on the platform.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/mfd/omap-usb-tll.c

@@ -96,10 +96,9 @@
 #define is_ehci_tll_mode(x)	(x == OMAP_EHCI_PORT_MODE_TLL)
 
 struct usbtll_omap {
-	struct clk				*usbtll_p1_fck;
-	struct clk				*usbtll_p2_fck;
 	int					nch;	/* num. of channels */
 	struct usbhs_omap_platform_data		*pdata;
+	struct clk				**ch_clk;
 	/* secure the register updates */
 	spinlock_t				lock;
 };
@@ -225,26 +224,12 @@ static int usbtll_omap_probe(struct platform_device *pdev)
 
 	tll->pdata = pdata;
 
-	tll->usbtll_p1_fck = clk_get(dev, "usb_tll_hs_usb_ch0_clk");
-	if (IS_ERR(tll->usbtll_p1_fck)) {
-		ret = PTR_ERR(tll->usbtll_p1_fck);
-		dev_err(dev, "usbtll_p1_fck failed error:%d\n", ret);
-		return ret;
-	}
-
-	tll->usbtll_p2_fck = clk_get(dev, "usb_tll_hs_usb_ch1_clk");
-	if (IS_ERR(tll->usbtll_p2_fck)) {
-		ret = PTR_ERR(tll->usbtll_p2_fck);
-		dev_err(dev, "usbtll_p2_fck failed error:%d\n", ret);
-		goto err_p2_fck;
-	}
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_request_and_ioremap(dev, res);
 	if (!base) {
 		ret = -EADDRNOTAVAIL;
 		dev_err(dev, "Resource request/ioremap failed:%d\n", ret);
-		goto err_res;
+		return ret;
 	}
 
 	platform_set_drvdata(pdev, tll);
@@ -270,6 +255,29 @@ static int usbtll_omap_probe(struct platform_device *pdev)
 		break;
 	}
 
+	spin_unlock_irqrestore(&tll->lock, flags);
+
+	tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk * [tll->nch]),
+						GFP_KERNEL);
+	if (!tll->ch_clk) {
+		ret = -ENOMEM;
+		dev_err(dev, "Couldn't allocate memory for channel clocks\n");
+		goto err_clk_alloc;
+	}
+
+	for (i = 0; i < tll->nch; i++) {
+		char clkname[] = "usb_tll_hs_usb_chx_clk";
+
+		snprintf(clkname, sizeof(clkname),
+					"usb_tll_hs_usb_ch%d_clk", i);
+		tll->ch_clk[i] = clk_get(dev, clkname);
+
+		if (IS_ERR(tll->ch_clk[i]))
+			dev_dbg(dev, "can't get clock : %s\n", clkname);
+	}
+
+	spin_lock_irqsave(&tll->lock, flags);
+
 	if (is_ehci_tll_mode(pdata->port_mode[0]) ||
 	    is_ehci_tll_mode(pdata->port_mode[1]) ||
 	    is_ehci_tll_mode(pdata->port_mode[2]) ||
@@ -321,11 +329,9 @@ static int usbtll_omap_probe(struct platform_device *pdev)
 
 	return 0;
 
-err_res:
-	clk_put(tll->usbtll_p2_fck);
-
-err_p2_fck:
-	clk_put(tll->usbtll_p1_fck);
+err_clk_alloc:
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
 
 	return ret;
 }
@@ -339,9 +345,12 @@ static int usbtll_omap_probe(struct platform_device *pdev)
 static int usbtll_omap_remove(struct platform_device *pdev)
 {
 	struct usbtll_omap *tll = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < tll->nch; i++)
+		if (!IS_ERR(tll->ch_clk[i]))
+			clk_put(tll->ch_clk[i]);
 
-	clk_put(tll->usbtll_p2_fck);
-	clk_put(tll->usbtll_p1_fck);
 	pm_runtime_disable(&pdev->dev);
 	return 0;
 }
@@ -351,6 +360,7 @@ static int usbtll_runtime_resume(struct device *dev)
 	struct usbtll_omap			*tll = dev_get_drvdata(dev);
 	struct usbhs_omap_platform_data		*pdata = tll->pdata;
 	unsigned long				flags;
+	int i;
 
 	dev_dbg(dev, "usbtll_runtime_resume\n");
 
@@ -361,11 +371,20 @@ static int usbtll_runtime_resume(struct device *dev)
 
 	spin_lock_irqsave(&tll->lock, flags);
 
-	if (is_ehci_tll_mode(pdata->port_mode[0]))
-		clk_enable(tll->usbtll_p1_fck);
+	for (i = 0; i < tll->nch; i++) {
+		if (is_ehci_tll_mode(pdata->port_mode[i])) {
+			int r;
 
-	if (is_ehci_tll_mode(pdata->port_mode[1]))
-		clk_enable(tll->usbtll_p2_fck);
+			if (IS_ERR(tll->ch_clk[i]))
+				continue;
+
+			r = clk_enable(tll->ch_clk[i]);
+			if (r) {
+				dev_err(dev,
+				 "Error enabling ch %d clock: %d\n", i, r);
+			}
+		}
+	}
 
 	spin_unlock_irqrestore(&tll->lock, flags);
 
@@ -377,6 +396,7 @@ static int usbtll_runtime_suspend(struct device *dev)
 	struct usbtll_omap			*tll = dev_get_drvdata(dev);
 	struct usbhs_omap_platform_data		*pdata = tll->pdata;
 	unsigned long				flags;
+	int i;
 
 	dev_dbg(dev, "usbtll_runtime_suspend\n");
 
@@ -387,11 +407,12 @@ static int usbtll_runtime_suspend(struct device *dev)
 
 	spin_lock_irqsave(&tll->lock, flags);
 
-	if (is_ehci_tll_mode(pdata->port_mode[0]))
-		clk_disable(tll->usbtll_p1_fck);
-
-	if (is_ehci_tll_mode(pdata->port_mode[1]))
-		clk_disable(tll->usbtll_p2_fck);
+	for (i = 0; i < tll->nch; i++) {
+		if (is_ehci_tll_mode(pdata->port_mode[i])) {
+			if (!IS_ERR(tll->ch_clk[i]))
+				clk_disable(tll->ch_clk[i]);
+		}
+	}
 
 	spin_unlock_irqrestore(&tll->lock, flags);