[PATCH 3/4] spi: zynq-qspi: Simplify clock handling with devm_clk_get_enabled()

[Mark Brown]

On Sat, Apr 04, 2026 at 11:45:00AM +0800, Pei Xiao wrote:
> Replace devm_clk_get() followed by clk_prepare_enable() with
> devm_clk_get_enabled() for both "pclk" and "ref_clk". This removes
> the need for explicit clock enable and disable calls, as the managed
> API automatically disables the clocks on device removal or probe
> failure.

Copying the driver maintainer.

> Remove the now-unnecessary clk_disable_unprepare() calls from the
> probe error paths and the remove callback. Simplify error handling
> by jumping directly to the remove_ctlr label.
> 
> Signed-off-by: Pei Xiao <xiaopei01 at kylinos.cn>
> ---
>  drivers/spi/spi-zynq-qspi.c | 31 ++++++-------------------------
>  1 file changed, 6 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/spi/spi-zynq-qspi.c b/drivers/spi/spi-zynq-qspi.c
> index 5232483c4a3a..8c3975030d0a 100644
> --- a/drivers/spi/spi-zynq-qspi.c
> +++ b/drivers/spi/spi-zynq-qspi.c
> @@ -661,7 +661,7 @@ static int zynq_qspi_probe(struct platform_device *pdev)
>  		goto remove_ctlr;
>  	}
>  
> -	xqspi->pclk = devm_clk_get(&pdev->dev, "pclk");
> +	xqspi->pclk = devm_clk_get_enabled(&pdev->dev, "pclk");
>  	if (IS_ERR(xqspi->pclk)) {
>  		dev_err(&pdev->dev, "pclk clock not found.\n");
>  		ret = PTR_ERR(xqspi->pclk);
> @@ -670,36 +670,24 @@ static int zynq_qspi_probe(struct platform_device *pdev)
>  
>  	init_completion(&xqspi->data_completion);
>  
> -	xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk");
> +	xqspi->refclk = devm_clk_get_enabled(&pdev->dev, "ref_clk");
>  	if (IS_ERR(xqspi->refclk)) {
>  		dev_err(&pdev->dev, "ref_clk clock not found.\n");
>  		ret = PTR_ERR(xqspi->refclk);
>  		goto remove_ctlr;
>  	}
>  
> -	ret = clk_prepare_enable(xqspi->pclk);
> -	if (ret) {
> -		dev_err(&pdev->dev, "Unable to enable APB clock.\n");
> -		goto remove_ctlr;
> -	}
> -
> -	ret = clk_prepare_enable(xqspi->refclk);
> -	if (ret) {
> -		dev_err(&pdev->dev, "Unable to enable device clock.\n");
> -		goto clk_dis_pclk;
> -	}
> -
>  	xqspi->irq = platform_get_irq(pdev, 0);
>  	if (xqspi->irq < 0) {
>  		ret = xqspi->irq;
> -		goto clk_dis_all;
> +		goto remove_ctlr;
>  	}
>  	ret = devm_request_irq(&pdev->dev, xqspi->irq, zynq_qspi_irq,
>  			       0, pdev->name, xqspi);
>  	if (ret != 0) {
>  		ret = -ENXIO;
>  		dev_err(&pdev->dev, "request_irq failed\n");
> -		goto clk_dis_all;
> +		goto remove_ctlr;
>  	}
>  
>  	ret = of_property_read_u32(np, "num-cs",
> @@ -709,7 +697,7 @@ static int zynq_qspi_probe(struct platform_device *pdev)
>  	} else if (num_cs > ZYNQ_QSPI_MAX_NUM_CS) {
>  		ret = -EINVAL;
>  		dev_err(&pdev->dev, "only 2 chip selects are available\n");
> -		goto clk_dis_all;
> +		goto remove_ctlr;
>  	} else {
>  		ctlr->num_chipselect = num_cs;
>  	}
> @@ -728,15 +716,11 @@ static int zynq_qspi_probe(struct platform_device *pdev)
>  	ret = devm_spi_register_controller(&pdev->dev, ctlr);
>  	if (ret) {
>  		dev_err(&pdev->dev, "devm_spi_register_controller failed\n");
> -		goto clk_dis_all;
> +		goto remove_ctlr;
>  	}
>  
>  	return ret;
>  
> -clk_dis_all:
> -	clk_disable_unprepare(xqspi->refclk);
> -clk_dis_pclk:
> -	clk_disable_unprepare(xqspi->pclk);
>  remove_ctlr:
>  	spi_controller_put(ctlr);
>  
> @@ -758,9 +742,6 @@ static void zynq_qspi_remove(struct platform_device *pdev)
>  	struct zynq_qspi *xqspi = platform_get_drvdata(pdev);
>  
>  	zynq_qspi_write(xqspi, ZYNQ_QSPI_ENABLE_OFFSET, 0);
> -
> -	clk_disable_unprepare(xqspi->refclk);
> -	clk_disable_unprepare(xqspi->pclk);
>  }
>  
>  static const struct of_device_id zynq_qspi_of_match[] = {
> -- 
> 2.25.1
> 
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