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

Anand Moon
2024-04-12T14:23:41Z

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 <linux.amoon@gmail.com>
---
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