[PATCH v4 1/5] usb: ehci-exynos: Use devm_clk_get_enabled() helpers

[Anand Moon]

The devm_clk_get_enabled() helpers:
    - call devm_clk_get()
    - call clk_prepare_enable() and register what is needed in order to
     call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code and avoids the calls to clk_disable_unprepare().

Reviewed-by: Alan Stern <stern at rowland.harvard.edu>
Signed-off-by: Anand Moon <linux.amoon at gmail.com>
---
v4: Add Rb Alan Stern

v3: drop dev_err_probe to simplify the error handle.

v2: drop the clk_disable_unprepare in suspend/resume functions
        fix the usb_put_hcd return before the devm_clk_get_enabled
---
 drivers/usb/host/ehci-exynos.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index f644b131cc0b..e2303757bc0f 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -159,20 +159,16 @@ static int exynos_ehci_probe(struct platform_device *pdev)
 
 	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
 	if (err)
-		goto fail_clk;
+		goto fail_io;
 
-	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
+	exynos_ehci->clk = devm_clk_get_enabled(&pdev->dev, "usbhost");
 
 	if (IS_ERR(exynos_ehci->clk)) {
 		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 		err = PTR_ERR(exynos_ehci->clk);
-		goto fail_clk;
+		goto fail_io;
 	}
 
-	err = clk_prepare_enable(exynos_ehci->clk);
-	if (err)
-		goto fail_clk;
-
 	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(hcd->regs)) {
 		err = PTR_ERR(hcd->regs);
@@ -223,8 +219,6 @@ static int exynos_ehci_probe(struct platform_device *pdev)
 	exynos_ehci_phy_disable(&pdev->dev);
 	pdev->dev.of_node = exynos_ehci->of_node;
 fail_io:
-	clk_disable_unprepare(exynos_ehci->clk);
-fail_clk:
 	usb_put_hcd(hcd);
 	return err;
 }
@@ -240,8 +234,6 @@ static void exynos_ehci_remove(struct platform_device *pdev)
 
 	exynos_ehci_phy_disable(&pdev->dev);
 
-	clk_disable_unprepare(exynos_ehci->clk);
-
 	usb_put_hcd(hcd);
 }
 
-- 
2.44.0