linux-kernel - [PATCH v3 3/5] usb: ohci-exynos: Use devm_clk_get

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Date: Fri, 12 Apr 2024 19:52:52 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Alim Akhtar <alim.akhtar@...sung.com>
Cc: Anand Moon <linux.amoon@...il.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Johan Hovold <johan@...nel.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	linux-usb@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/5] usb: ohci-exynos: Use devm_clk_get_enabled() helpers

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@...il.com>
---
v3: drop dev_err_probe to simplify the error handle.

v2: new patch in this series
---
 drivers/usb/host/ohci-exynos.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
index 20e26a474591..89e6587c089b 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -135,20 +135,16 @@ static int exynos_ohci_probe(struct platform_device *pdev)
 
 	err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
 	if (err)
-		goto fail_clk;
+		goto fail_io;
 
-	exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
+	exynos_ohci->clk = devm_clk_get_enabled(&pdev->dev, "usbhost");
 
 	if (IS_ERR(exynos_ohci->clk)) {
 		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 		err = PTR_ERR(exynos_ohci->clk);
-		goto fail_clk;
+		goto fail_io;
 	}
 
-	err = clk_prepare_enable(exynos_ohci->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);
@@ -191,8 +187,6 @@ static int exynos_ohci_probe(struct platform_device *pdev)
 	exynos_ohci_phy_disable(&pdev->dev);
 	pdev->dev.of_node = exynos_ohci->of_node;
 fail_io:
-	clk_disable_unprepare(exynos_ohci->clk);
-fail_clk:
 	usb_put_hcd(hcd);
 	return err;
 }
@@ -208,8 +202,6 @@ static void exynos_ohci_remove(struct platform_device *pdev)
 
 	exynos_ohci_phy_disable(&pdev->dev);
 
-	clk_disable_unprepare(exynos_ohci->clk);
-
 	usb_put_hcd(hcd);
 }
 
-- 
2.44.0