linux-kernel - [PATCH v2 4/5] usb: mpfs: Use devm_clk_get

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Message-Id: <20240826070658.1933-1-liulei.rjpt@vivo.com>
Date: Mon, 26 Aug 2024 15:06:57 +0800
From: Lei Liu <liulei.rjpt@...o.com>
To: Conor Dooley <conor.dooley@...rochip.com>,
	Daire McNamara <daire.mcnamara@...rochip.com>,
	Bin Liu <b-liu@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-riscv@...ts.infradead.org,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com,
	Lei Liu <liulei.rjpt@...o.com>
Subject: [PATCH v2 4/5] usb: mpfs: 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 calls to clk_disable_unprepare().

---
v1 -> v2
Incorrect usage of devm_clk_get_enable() should be corrected to
devm_clk_get_enabled().

Signed-off-by: Lei Liu <liulei.rjpt@...o.com>
---
 drivers/usb/musb/mpfs.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/musb/mpfs.c b/drivers/usb/musb/mpfs.c
index 29c7e5cdb230..ce6ad65c5fd0 100644
--- a/drivers/usb/musb/mpfs.c
+++ b/drivers/usb/musb/mpfs.c
@@ -159,19 +159,13 @@ static int mpfs_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	clk = devm_clk_get(&pdev->dev, NULL);
+	clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(clk)) {
 		dev_err(&pdev->dev, "failed to get clock\n");
 		ret = PTR_ERR(clk);
 		goto err_phy_release;
 	}
 
-	ret = clk_prepare_enable(clk);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to enable clock\n");
-		goto err_phy_release;
-	}
-
 	musb_pdev->dev.parent = dev;
 	musb_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(39);
 	musb_pdev->dev.dma_mask = &musb_pdev->dev.coherent_dma_mask;
@@ -184,7 +178,7 @@ static int mpfs_probe(struct platform_device *pdev)
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata) {
 		ret = -ENOMEM;
-		goto err_clk_disable;
+		goto err_phy_release;
 	}
 
 	pdata->config = &mpfs_musb_hdrc_config;
@@ -203,7 +197,7 @@ static int mpfs_probe(struct platform_device *pdev)
 		dev_err(dev, "failed to register usb-phy %ld\n",
 			PTR_ERR(glue->phy));
 		ret = PTR_ERR(glue->phy);
-		goto err_clk_disable;
+		goto err_phy_release;
 	}
 
 	platform_set_drvdata(pdev, glue);
@@ -211,27 +205,24 @@ static int mpfs_probe(struct platform_device *pdev)
 	ret = platform_device_add_resources(musb_pdev, pdev->resource, pdev->num_resources);
 	if (ret) {
 		dev_err(dev, "failed to add resources\n");
-		goto err_clk_disable;
+		goto err_phy_release;
 	}
 
 	ret = platform_device_add_data(musb_pdev, pdata, sizeof(*pdata));
 	if (ret) {
 		dev_err(dev, "failed to add platform_data\n");
-		goto err_clk_disable;
+		goto err_phy_release;
 	}
 
 	ret = platform_device_add(musb_pdev);
 	if (ret) {
 		dev_err(dev, "failed to register musb device\n");
-		goto err_clk_disable;
+		goto err_phy_release;
 	}
 
 	dev_info(&pdev->dev, "Registered MPFS MUSB driver\n");
 	return 0;
 
-err_clk_disable:
-	clk_disable_unprepare(clk);
-
 err_phy_release:
 	usb_phy_generic_unregister(glue->phy);
 	platform_device_put(musb_pdev);
@@ -242,7 +233,6 @@ static void mpfs_remove(struct platform_device *pdev)
 {
 	struct mpfs_glue *glue = platform_get_drvdata(pdev);
 
-	clk_disable_unprepare(glue->clk);
 	platform_device_unregister(glue->musb);
 	usb_phy_generic_unregister(pdev);
 }
-- 
2.34.1