linux-kernel - Re: [PATCH v2 5/7] dmaengine:imx-sdma:Use devm_clk_get

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Message-ID: <ZtHhE6RQP6f/2NsI@lizhi-Precision-Tower-5810>
Date: Fri, 30 Aug 2024 11:11:15 -0400
From: Frank Li <Frank.li@....com>
To: Liao Yuanhong <liaoyuanhong@...o.com>
Cc: vkoul@...nel.org, dmaengine@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev
Subject: Re: [PATCH v2 5/7] dmaengine:imx-sdma:Use devm_clk_get_prepared()
 helpers

On Fri, Aug 30, 2024 at 05:41:16PM +0800, Liao Yuanhong wrote:
> Use devm_clk_get_prepared() instead of clk functions in imx-sdma.
>
> Signed-off-by: Liao Yuanhong <liaoyuanhong@...o.com>

Reviewed-by: Frank Li <Frank.Li@....com>
> ---
> v2:remove all enable related modifications, replace clk_prepare() with
> devm_clk_get_prepared()
> ---
>  drivers/dma/imx-sdma.c | 22 ++++------------------
>  1 file changed, 4 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index 72299a08af44..07a017c40a82 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -2266,33 +2266,25 @@ static int sdma_probe(struct platform_device *pdev)
>  	if (IS_ERR(sdma->regs))
>  		return PTR_ERR(sdma->regs);
>
> -	sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
> +	sdma->clk_ipg = devm_clk_get_prepared(&pdev->dev, "ipg");
>  	if (IS_ERR(sdma->clk_ipg))
>  		return PTR_ERR(sdma->clk_ipg);
>
> -	sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
> +	sdma->clk_ahb = devm_clk_get_prepared(&pdev->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(&pdev->dev, irq, sdma_int_handler, 0,
>  				dev_name(&pdev->dev), sdma);
>  	if (ret)
> -		goto err_irq;
> +		return ret;
>
>  	sdma->irq = irq;
>
>  	sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL);
>  	if (!sdma->script_addrs) {
>  		ret = -ENOMEM;
> -		goto err_irq;
> +		return ret;
>  	}
>
>  	/* initially no scripts available */
> @@ -2407,10 +2399,6 @@ static int sdma_probe(struct platform_device *pdev)
>  	dma_async_device_unregister(&sdma->dma_device);
>  err_init:
>  	kfree(sdma->script_addrs);
> -err_irq:
> -	clk_unprepare(sdma->clk_ahb);
> -err_clk:
> -	clk_unprepare(sdma->clk_ipg);
>  	return ret;
>  }
>
> @@ -2422,8 +2410,6 @@ static void sdma_remove(struct platform_device *pdev)
>  	devm_free_irq(&pdev->dev, sdma->irq, sdma);
>  	dma_async_device_unregister(&sdma->dma_device);
>  	kfree(sdma->script_addrs);
> -	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];
> --
> 2.25.1
>