usb: host: ohci-omap: Make it CCF clk API compatible

The driver, OMAP1 specific, now omits clk_prepare/unprepare() steps, not
supported by OMAP1 custom implementation of clock API.  However, non-CCF
stubs of those functions exist for use on such platforms until converted
to CCF.

Update the driver to be compatible with CCF implementation of clock API.
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Link: https://lore.kernel.org/r/20220402114353.130775-1-jmkrzyszt@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ohci-omap.c

@@ -281,6 +281,10 @@ static int ohci_hcd_omap_probe(struct platform_device *pdev)
 		goto err_put_hcd;
 	}
 
+	retval = clk_prepare(priv->usb_host_ck);
+	if (retval)
+		goto err_put_host_ck;
+
 	if (!cpu_is_omap15xx())
 		priv->usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
 	else
@@ -288,13 +292,17 @@ static int ohci_hcd_omap_probe(struct platform_device *pdev)
 
 	if (IS_ERR(priv->usb_dc_ck)) {
 		retval = PTR_ERR(priv->usb_dc_ck);
-		goto err_put_host_ck;
+		goto err_unprepare_host_ck;
 	}
 
+	retval = clk_prepare(priv->usb_dc_ck);
+	if (retval)
+		goto err_put_dc_ck;
+
 	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 		dev_dbg(&pdev->dev, "request_mem_region failed\n");
 		retval = -EBUSY;
-		goto err_put_dc_ck;
+		goto err_unprepare_dc_ck;
 	}
 
 	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
@@ -319,8 +327,12 @@ static int ohci_hcd_omap_probe(struct platform_device *pdev)
 	iounmap(hcd->regs);
 err2:
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err_unprepare_dc_ck:
+	clk_unprepare(priv->usb_dc_ck);
 err_put_dc_ck:
 	clk_put(priv->usb_dc_ck);
+err_unprepare_host_ck:
+	clk_unprepare(priv->usb_host_ck);
 err_put_host_ck:
 	clk_put(priv->usb_host_ck);
 err_put_hcd:
@@ -355,7 +367,9 @@ static int ohci_hcd_omap_remove(struct platform_device *pdev)
 	}
 	iounmap(hcd->regs);
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+	clk_unprepare(priv->usb_dc_ck);
 	clk_put(priv->usb_dc_ck);
+	clk_unprepare(priv->usb_host_ck);
 	clk_put(priv->usb_host_ck);
 	usb_put_hcd(hcd);
 	return 0;