usb: ohci-platform: use reset array API

Generic drivers like this need to control arbitrary number of reset
lines.  Instead of hard-coding the maximum number of resets, use the
reset array API.  It can manage a bunch of resets behind the scene.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ohci-platform.c

@@ -34,12 +34,11 @@
 
 #define DRIVER_DESC "OHCI generic platform driver"
 #define OHCI_MAX_CLKS 3
-#define OHCI_MAX_RESETS 2
 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
 
 struct ohci_platform_priv {
 	struct clk *clks[OHCI_MAX_CLKS];
-	struct reset_control *resets[OHCI_MAX_RESETS];
+	struct reset_control *resets;
 	struct phy **phys;
 	int num_phys;
 };
@@ -119,7 +118,7 @@ static int ohci_platform_probe(struct platform_device *dev)
 	struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ohci_platform_priv *priv;
 	struct ohci_hcd *ohci;
-	int err, irq, phy_num, clk = 0, rst = 0;
+	int err, irq, phy_num, clk = 0;
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -204,21 +203,17 @@ static int ohci_platform_probe(struct platform_device *dev)
 				break;
 			}
 		}
-		for (rst = 0; rst < OHCI_MAX_RESETS; rst++) {
-			priv->resets[rst] =
-				devm_reset_control_get_shared_by_index(
-								&dev->dev, rst);
-			if (IS_ERR(priv->resets[rst])) {
-				err = PTR_ERR(priv->resets[rst]);
-				if (err == -EPROBE_DEFER)
-					goto err_reset;
-				priv->resets[rst] = NULL;
-				break;
-			}
-			err = reset_control_deassert(priv->resets[rst]);
-			if (err)
-				goto err_reset;
+
+		priv->resets = devm_reset_control_array_get_optional_shared(
+								&dev->dev);
+		if (IS_ERR(priv->resets)) {
+			err = PTR_ERR(priv->resets);
+			goto err_put_clks;
 		}
+
+		err = reset_control_deassert(priv->resets);
+		if (err)
+			goto err_put_clks;
 	}
 
 	if (pdata->big_endian_desc)
@@ -279,8 +274,7 @@ err_power:
 		pdata->power_off(dev);
 err_reset:
 	pm_runtime_disable(&dev->dev);
-	while (--rst >= 0)
-		reset_control_assert(priv->resets[rst]);
+	reset_control_assert(priv->resets);
 err_put_clks:
 	while (--clk >= 0)
 		clk_put(priv->clks[clk]);
@@ -298,7 +292,7 @@ static int ohci_platform_remove(struct platform_device *dev)
 	struct usb_hcd *hcd = platform_get_drvdata(dev);
 	struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
-	int clk, rst;
+	int clk;
 
 	pm_runtime_get_sync(&dev->dev);
 	usb_remove_hcd(hcd);
@@ -306,8 +300,7 @@ static int ohci_platform_remove(struct platform_device *dev)
 	if (pdata->power_off)
 		pdata->power_off(dev);
 
-	for (rst = 0; rst < OHCI_MAX_RESETS && priv->resets[rst]; rst++)
-		reset_control_assert(priv->resets[rst]);
+	reset_control_assert(priv->resets);
 
 	for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
 		clk_put(priv->clks[clk]);