[v3,1/5] usb: ehci-exynos: Use devm_clk_get_enabled() helpers

Commit Message

Anand Moon April 12, 2024, 2:22 p.m. UTC

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().

Signed-off-by: Anand Moon <[e-mail]>
---
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(-)

Comments

Alan Stern April 12, 2024, 2:58 p.m. UTC | #1

On Fri, Apr 12, 2024 at 07:52:50PM +0530, Anand Moon wrote:
> 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().
> 
> Signed-off-by: Anand Moon <[e-mail]>
> ---

For patches 1 - 4:

Reviewed-by: Alan Stern <[e-mail]>

Patch

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);
 }