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Subject[PATCH v3 4/7] USB: gadget: atmel_usba: prepare clk before calling enable
Date
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>
---
drivers/usb/gadget/atmel_usba_udc.c | 28 +++++++++++++++++++++-------
1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index 1d97222..f018017 100644
--- 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);
--
1.7.9.5


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