linux-kernel - Re: [PATCH v3 2/4] mmc: sdhci-pxav2: switch to managed clk and sdhci_pltfm

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Date:   Mon, 21 Aug 2017 15:03:42 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-mmc@...r.kernel.org
Cc:     Piotr Sroka <piotrs@...ence.com>, Hu Ziji <huziji@...vell.com>,
        Christian Daudt <csd@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Zhangfei Gao <zhangfei.gao@...vell.com>,
        Kevin Hao <haokexin@...il.com>,
        Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Jisheng Zhang <jszhang@...vell.com>
Subject: Re: [PATCH v3 2/4] mmc: sdhci-pxav2: switch to managed clk and
 sdhci_pltfm_unregister()

On 15/08/17 18:45, Masahiro Yamada wrote:
> The difference between sdhci_pxav2_remove() and sdhci_pltfm_unregister()
> is clk_put().  It will go away by using the managed resource clk, then
> sdhci_pltfm_unregister() can be reused.
> 
> Also, rename the jump labels to say what the goto does. (Coding style
> suggested by Documentation/process/coding-style.rst)
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Cc'ing Jisheng Zhang, but looks ok to me.

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
> 
> Changes in v3:
>   - Newly added
> 
> Changes in v2: None
> 
>  drivers/mmc/host/sdhci-pxav2.c | 30 +++++++-----------------------
>  1 file changed, 7 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pxav2.c b/drivers/mmc/host/sdhci-pxav2.c
> index 995083ce1c46..8986f9d9cf98 100644
> --- a/drivers/mmc/host/sdhci-pxav2.c
> +++ b/drivers/mmc/host/sdhci-pxav2.c
> @@ -178,17 +178,17 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
>  
>  	pltfm_host = sdhci_priv(host);
>  
> -	clk = clk_get(dev, "PXA-SDHCLK");
> +	clk = devm_clk_get(dev, "PXA-SDHCLK");
>  	if (IS_ERR(clk)) {
>  		dev_err(dev, "failed to get io clock\n");
>  		ret = PTR_ERR(clk);
> -		goto err_clk_get;
> +		goto free;
>  	}
>  	pltfm_host->clk = clk;
>  	ret = clk_prepare_enable(clk);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to enable io clock\n");
> -		goto err_clk_enable;
> +		goto free;
>  	}
>  
>  	host->quirks = SDHCI_QUIRK_BROKEN_ADMA
> @@ -223,34 +223,18 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
>  	ret = sdhci_add_host(host);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to add host\n");
> -		goto err_add_host;
> +		goto disable_clk;
>  	}
>  
>  	return 0;
>  
> -err_add_host:
> +disable_clk:
>  	clk_disable_unprepare(clk);
> -err_clk_enable:
> -	clk_put(clk);
> -err_clk_get:
> +free:
>  	sdhci_pltfm_free(pdev);
>  	return ret;
>  }
>  
> -static int sdhci_pxav2_remove(struct platform_device *pdev)
> -{
> -	struct sdhci_host *host = platform_get_drvdata(pdev);
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> -
> -	sdhci_remove_host(host, 1);
> -
> -	clk_disable_unprepare(pltfm_host->clk);
> -	clk_put(pltfm_host->clk);
> -	sdhci_pltfm_free(pdev);
> -
> -	return 0;
> -}
> -
>  static struct platform_driver sdhci_pxav2_driver = {
>  	.driver		= {
>  		.name	= "sdhci-pxav2",
> @@ -258,7 +242,7 @@ static struct platform_driver sdhci_pxav2_driver = {
>  		.pm	= &sdhci_pltfm_pmops,
>  	},
>  	.probe		= sdhci_pxav2_probe,
> -	.remove		= sdhci_pxav2_remove,
> +	.remove		= sdhci_pltfm_unregister,
>  };
>  
>  module_platform_driver(sdhci_pxav2_driver);
>