linux-kernel - Re: [PATCH 04/11] usb: dwc3: imx8mp: simplify with devm_clk_get

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Message-ID: <ZrzRDdeyaVzZJ7NP@lizhi-Precision-Tower-5810>
Date: Wed, 14 Aug 2024 11:45:17 -0400
From: Frank Li <Frank.li@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Patrice Chotard <patrice.chotard@...s.st.com>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Michal Simek <michal.simek@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 04/11] usb: dwc3: imx8mp: simplify with
 devm_clk_get_enabled

On Wed, Aug 14, 2024 at 12:35:40PM +0200, Krzysztof Kozlowski wrote:
> Use devm_clk_get_enabled() to drop clock preparing and handling from
> error and remove paths.  This makes the code a bit simpler.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Reviewed-by: Frank Li <Frank.Li@....com>

> ---
>  drivers/usb/dwc3/dwc3-imx8mp.c | 32 +++++---------------------------
>  1 file changed, 5 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c
> index 392fa1232788..8c91e595d3b9 100644
> --- a/drivers/usb/dwc3/dwc3-imx8mp.c
> +++ b/drivers/usb/dwc3/dwc3-imx8mp.c
> @@ -178,37 +178,23 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
>  			return PTR_ERR(dwc3_imx->glue_base);
>  	}
>
> -	dwc3_imx->hsio_clk = devm_clk_get(dev, "hsio");
> +	dwc3_imx->hsio_clk = devm_clk_get_enabled(dev, "hsio");
>  	if (IS_ERR(dwc3_imx->hsio_clk)) {
>  		err = PTR_ERR(dwc3_imx->hsio_clk);
>  		dev_err(dev, "Failed to get hsio clk, err=%d\n", err);
>  		return err;
>  	}
>
> -	err = clk_prepare_enable(dwc3_imx->hsio_clk);
> -	if (err) {
> -		dev_err(dev, "Failed to enable hsio clk, err=%d\n", err);
> -		return err;
> -	}
> -
> -	dwc3_imx->suspend_clk = devm_clk_get(dev, "suspend");
> +	dwc3_imx->suspend_clk = devm_clk_get_enabled(dev, "suspend");
>  	if (IS_ERR(dwc3_imx->suspend_clk)) {
>  		err = PTR_ERR(dwc3_imx->suspend_clk);
>  		dev_err(dev, "Failed to get suspend clk, err=%d\n", err);
> -		goto disable_hsio_clk;
> -	}
> -
> -	err = clk_prepare_enable(dwc3_imx->suspend_clk);
> -	if (err) {
> -		dev_err(dev, "Failed to enable suspend clk, err=%d\n", err);
> -		goto disable_hsio_clk;
> +		return err;
>  	}
>
>  	irq = platform_get_irq(pdev, 0);
> -	if (irq < 0) {
> -		err = irq;
> -		goto disable_clks;
> -	}
> +	if (irq < 0)
> +		return irq;
>  	dwc3_imx->irq = irq;
>
>  	imx8mp_configure_glue(dwc3_imx);
> @@ -259,25 +245,17 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
>  disable_rpm:
>  	pm_runtime_disable(dev);
>  	pm_runtime_put_noidle(dev);
> -disable_clks:
> -	clk_disable_unprepare(dwc3_imx->suspend_clk);
> -disable_hsio_clk:
> -	clk_disable_unprepare(dwc3_imx->hsio_clk);
>
>  	return err;
>  }
>
>  static void dwc3_imx8mp_remove(struct platform_device *pdev)
>  {
> -	struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev);
>  	struct device *dev = &pdev->dev;
>
>  	pm_runtime_get_sync(dev);
>  	of_platform_depopulate(dev);
>
> -	clk_disable_unprepare(dwc3_imx->suspend_clk);
> -	clk_disable_unprepare(dwc3_imx->hsio_clk);
> -
>  	pm_runtime_disable(dev);
>  	pm_runtime_put_noidle(dev);
>  }
>
> --
> 2.43.0
>