usb: gadget: atmel_usba: prepare clk before calling enable

Replace clk_enable/disable with clk_prepare_enable/disable_unprepare to
avoid common clk framework warnings.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index 1d9722203ca66da925ac348a4021ffa0106c4c7a..f018017e3a77da728008b880946657f031c6f2ba 100644 (file)
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -1772,6 +1772,7 @@ out:
 static int atmel_usba_start(struct usb_gadget *gadget,
                struct usb_gadget_driver *driver)
 {
+       int ret = 0;
        struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
        unsigned long flags;
 
@@ -1781,8 +1782,14 @@ static int atmel_usba_start(struct usb_gadget *gadget,
        udc->driver = driver;
        spin_unlock_irqrestore(&udc->lock, flags);
 
-       clk_enable(udc->pclk);
-       clk_enable(udc->hclk);
+       ret = clk_prepare_enable(udc->pclk);
+       if (ret)
+               goto out;
+       ret = clk_prepare_enable(udc->hclk);
+       if (ret) {
+               clk_disable_unprepare(udc->pclk);
+               goto out;
+       }
 
        DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
 
@@ -1797,9 +1804,11 @@ static int atmel_usba_start(struct usb_gadget *gadget,
                usba_writel(udc, CTRL, USBA_ENABLE_MASK);
                usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
        }
+
+out:
        spin_unlock_irqrestore(&udc->lock, flags);
 
-       return 0;
+       return ret;
 }
 
 static int atmel_usba_stop(struct usb_gadget *gadget,
@@ -1822,8 +1831,8 @@ static int atmel_usba_stop(struct usb_gadget *gadget,
 
        udc->driver = NULL;
 
-       clk_disable(udc->hclk);
-       clk_disable(udc->pclk);
+       clk_disable_unprepare(udc->hclk);
+       clk_disable_unprepare(udc->pclk);
 
        DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
 
@@ -2022,10 +2031,14 @@ static int __init usba_udc_probe(struct platform_device *pdev)
        platform_set_drvdata(pdev, udc);
 
        /* Make sure we start from a clean slate */
-       clk_enable(pclk);
+       ret = clk_prepare_enable(pclk);
+       if (ret) {
+               dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
+               goto err_clk_enable;
+       }
        toggle_bias(0);
        usba_writel(udc, CTRL, USBA_DISABLE_MASK);
-       clk_disable(pclk);
+       clk_disable_unprepare(pclk);
 
        if (pdev->dev.of_node)
                udc->usba_ep = atmel_udc_of_init(pdev, udc);
@@ -2081,6 +2094,7 @@ err_add_udc:
        free_irq(irq, udc);
 err_request_irq:
 err_alloc_ep:
+err_clk_enable:
        iounmap(udc->fifo);
 err_map_fifo:
        iounmap(udc->regs);