linux-kernel - [PATCH v1 07/12] dmaengine: fsl-edma: refactor using devm_clk_get

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Date:   Fri, 26 May 2023 10:36:34 -0400
From:   Frank Li <Frank.Li@....com>
To:     vkoul@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        peng.fan@....com, joy.zou@....com, shenwei.wang@....com,
        imx@...ts.linux.dev
Subject: [PATCH v1 07/12] dmaengine: fsl-edma: refactor using devm_clk_get_enabled

Use devm_clk_get_enabled in probe code to reduce error checks,
thereby enhancing readability

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/dma/fsl-edma-main.c | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
index 9c0b6fb4cb8f..6126717fc87e 100644
--- a/drivers/dma/fsl-edma-main.c
+++ b/drivers/dma/fsl-edma-main.c
@@ -268,17 +268,11 @@ static int fsl_edma_probe(struct platform_device *pdev)
 	regs = &fsl_edma->regs;
 
 	if (drvdata->flags & FSL_EDMA_DRV_HAS_DMACLK) {
-		fsl_edma->dmaclk = devm_clk_get(&pdev->dev, "dma");
+		fsl_edma->dmaclk = devm_clk_get_enabled(&pdev->dev, "dma");
 		if (IS_ERR(fsl_edma->dmaclk)) {
 			dev_err(&pdev->dev, "Missing DMA block clock.\n");
 			return PTR_ERR(fsl_edma->dmaclk);
 		}
-
-		ret = clk_prepare_enable(fsl_edma->dmaclk);
-		if (ret) {
-			dev_err(&pdev->dev, "DMA clk block failed.\n");
-			return ret;
-		}
 	}
 
 	for (i = 0; i < fsl_edma->drvdata->dmamuxs; i++) {
@@ -293,19 +287,12 @@ static int fsl_edma_probe(struct platform_device *pdev)
 		}
 
 		sprintf(clkname, "dmamux%d", i);
-		fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname);
+		fsl_edma->muxclk[i] = devm_clk_get_enabled(&pdev->dev, clkname);
 		if (IS_ERR(fsl_edma->muxclk[i])) {
 			dev_err(&pdev->dev, "Missing DMAMUX block clock.\n");
 			/* on error: disable all previously enabled clks */
-			fsl_disable_clocks(fsl_edma, i);
 			return PTR_ERR(fsl_edma->muxclk[i]);
 		}
-
-		ret = clk_prepare_enable(fsl_edma->muxclk[i]);
-		if (ret)
-			/* on error: disable all previously enabled clks */
-			fsl_disable_clocks(fsl_edma, i);
-
 	}
 
 	fsl_edma->big_endian = of_property_read_bool(np, "big-endian");
@@ -366,7 +353,6 @@ static int fsl_edma_probe(struct platform_device *pdev)
 	if (ret) {
 		dev_err(&pdev->dev,
 			"Can't register Freescale eDMA engine. (%d)\n", ret);
-		fsl_disable_clocks(fsl_edma, fsl_edma->drvdata->dmamuxs);
 		return ret;
 	}
 
@@ -375,7 +361,6 @@ static int fsl_edma_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev,
 			"Can't register Freescale eDMA of_dma. (%d)\n", ret);
 		dma_async_device_unregister(&fsl_edma->dma_dev);
-		fsl_disable_clocks(fsl_edma, fsl_edma->drvdata->dmamuxs);
 		return ret;
 	}
 
-- 
2.34.1