linux-kernel - [PATCH v2 07/10] dmaengine: imx-sdma: make use of devm_clk_get

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Message-Id: <20250911-v6-16-topic-sdma-v2-7-d315f56343b5@pengutronix.de>
Date: Thu, 11 Sep 2025 23:56:48 +0200
From: Marco Felsch <m.felsch@...gutronix.de>
To: Vinod Koul <vkoul@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Jiada Wang <jiada_wang@...tor.com>
Cc: dmaengine@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Marco Felsch <m.felsch@...gutronix.de>, Frank Li <Frank.Li@....com>
Subject: [PATCH v2 07/10] dmaengine: imx-sdma: make use of
 devm_clk_get_prepared()

Make use of the devm_clk_get_prepared() to cleanup the error handling
during probe() and to automatically unprepare the clock during remove.

Reviewed-by: Frank Li <Frank.Li@....com>
Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
---
 drivers/dma/imx-sdma.c | 27 +++++++--------------------
 1 file changed, 7 insertions(+), 20 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index d6239900ba12063bdb7d807db1bdbdc2b446a94c..d39589c20c4b2a26d0239feb86cce8d5a0f5acdd 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -2300,26 +2300,18 @@ static int sdma_probe(struct platform_device *pdev)
 	if (IS_ERR(sdma->regs))
 		return PTR_ERR(sdma->regs);
 
-	sdma->clk_ipg = devm_clk_get(dev, "ipg");
+	sdma->clk_ipg = devm_clk_get_prepared(dev, "ipg");
 	if (IS_ERR(sdma->clk_ipg))
 		return PTR_ERR(sdma->clk_ipg);
 
-	sdma->clk_ahb = devm_clk_get(dev, "ahb");
+	sdma->clk_ahb = devm_clk_get_prepared(dev, "ahb");
 	if (IS_ERR(sdma->clk_ahb))
 		return PTR_ERR(sdma->clk_ahb);
 
-	ret = clk_prepare(sdma->clk_ipg);
-	if (ret)
-		return ret;
-
-	ret = clk_prepare(sdma->clk_ahb);
-	if (ret)
-		goto err_clk;
-
 	ret = devm_request_irq(dev, irq, sdma_int_handler, 0,
 			       dev_name(dev), sdma);
 	if (ret)
-		goto err_irq;
+		return ret;
 
 	sdma->irq = irq;
 
@@ -2360,11 +2352,11 @@ static int sdma_probe(struct platform_device *pdev)
 
 	ret = sdma_init(sdma);
 	if (ret)
-		goto err_irq;
+		return ret;
 
 	ret = sdma_event_remap(sdma);
 	if (ret)
-		goto err_irq;
+		return ret;
 
 	if (sdma->drvdata->script_addrs)
 		sdma_add_scripts(sdma, sdma->drvdata->script_addrs);
@@ -2393,7 +2385,7 @@ static int sdma_probe(struct platform_device *pdev)
 	ret = dma_async_device_register(&sdma->dma_device);
 	if (ret) {
 		dev_err(dev, "unable to register\n");
-		goto err_irq;
+		return ret;
 	}
 
 	ret = of_dma_controller_register(np, sdma_xlate, sdma);
@@ -2421,10 +2413,7 @@ static int sdma_probe(struct platform_device *pdev)
 
 err_register:
 	dma_async_device_unregister(&sdma->dma_device);
-err_irq:
-	clk_unprepare(sdma->clk_ahb);
-err_clk:
-	clk_unprepare(sdma->clk_ipg);
+
 	return ret;
 }
 
@@ -2436,8 +2425,6 @@ static void sdma_remove(struct platform_device *pdev)
 	of_dma_controller_free(sdma->dev->of_node);
 	devm_free_irq(&pdev->dev, sdma->irq, sdma);
 	dma_async_device_unregister(&sdma->dma_device);
-	clk_unprepare(sdma->clk_ahb);
-	clk_unprepare(sdma->clk_ipg);
 	/* Kill the tasklet */
 	for (i = 0; i < MAX_DMA_CHANNELS; i++) {
 		struct sdma_channel *sdmac = &sdma->channel[i];

-- 
2.47.3