[ARM] 5526/1: ep93xx: usb driver cleanup

Cleanup the ohci-ep93xx driver.

1) Use the usb.h dbg() macro instead of pr_debug() so that
   the source filename is prefixed to the message and it is
   terminated with a linefeed.

2) Add error handling for the clk_get() call.

3) Update clkdev support so that the usb clock is matched by
   the dev_id instead of the con_id.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-ep93xx/clock.c

@@ -103,7 +103,7 @@ static struct clk_lookup clocks[] = {
 	INIT_CK(NULL, "hclk", &clk_h),
 	INIT_CK(NULL, "pclk", &clk_p),
 	INIT_CK(NULL, "pll2", &clk_pll2),
-	INIT_CK(NULL, "usb_host", &clk_usb_host),
+	INIT_CK("ep93xx-ohci", NULL, &clk_usb_host),
 	INIT_CK(NULL, "m2p0", &clk_m2p0),
 	INIT_CK(NULL, "m2p1", &clk_m2p1),
 	INIT_CK(NULL, "m2p2", &clk_m2p2),

drivers/usb/host/ohci-ep93xx.c

@@ -47,7 +47,7 @@ static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
 	struct usb_hcd *hcd;
 
 	if (pdev->resource[1].flags != IORESOURCE_IRQ) {
-		pr_debug("resource[1] is not IORESOURCE_IRQ");
+		dbg("resource[1] is not IORESOURCE_IRQ");
 		return -ENOMEM;
 	}
 
@@ -65,12 +65,18 @@ static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
 
 	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 	if (hcd->regs == NULL) {
-		pr_debug("ioremap failed");
+		dbg("ioremap failed");
 		retval = -ENOMEM;
 		goto err2;
 	}
 
-	usb_host_clock = clk_get(&pdev->dev, "usb_host");
+	usb_host_clock = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(usb_host_clock)) {
+		dbg("clk_get failed");
+		retval = PTR_ERR(usb_host_clock);
+		goto err3;
+	}
+
 	ep93xx_start_hc(&pdev->dev);
 
 	ohci_hcd_init(hcd_to_ohci(hcd));
@@ -80,6 +86,7 @@ static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
 		return retval;
 
 	ep93xx_stop_hc(&pdev->dev);
+err3:
 	iounmap(hcd->regs);
 err2:
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);