linux-kernel - Re: [PATCH v4 05/10] memory: tegra20-emc: Replace clk_get_sys with devm_clk

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Date:   Mon, 17 Jun 2019 11:46:02 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Joseph Lo <josephl@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 05/10] memory: tegra20-emc: Replace clk_get_sys with
 devm_clk_get

On Mon, Jun 17, 2019 at 02:35:46AM +0300, Dmitry Osipenko wrote:
> There is no problem for drivers to request pll_m and pll_p clocks for
> the device, hence there is no need to use clk_get_sys() and it could be
> replaced with devm_clk_get() for consistency.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/memory/tegra/tegra20-emc.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
> index 43aef3614b65..527aa4b90e95 100644
> --- a/drivers/memory/tegra/tegra20-emc.c
> +++ b/drivers/memory/tegra/tegra20-emc.c
> @@ -527,33 +527,29 @@ static int tegra_emc_probe(struct platform_device *pdev)
>  		goto unset_cb;
>  	}
>  
> -	emc->pll_m = clk_get_sys(NULL, "pll_m");
> +	emc->pll_m = devm_clk_get(&pdev->dev, "pll_m");

Interesting... I didn't know that clk_get() had a fallback path to
return clk_get_sys() if the named clock wasn't found in DT. That's
nice.

Looks good to me.

Thierry

>  	if (IS_ERR(emc->pll_m)) {
>  		err = PTR_ERR(emc->pll_m);
>  		dev_err(&pdev->dev, "failed to get pll_m clock: %d\n", err);
>  		goto unset_cb;
>  	}
>  
> -	emc->backup_clk = clk_get_sys(NULL, "pll_p");
> +	emc->backup_clk = devm_clk_get(&pdev->dev, "pll_p");
>  	if (IS_ERR(emc->backup_clk)) {
>  		err = PTR_ERR(emc->backup_clk);
>  		dev_err(&pdev->dev, "failed to get pll_p clock: %d\n", err);
> -		goto put_pll_m;
> +		goto unset_cb;
>  	}
>  
>  	err = clk_notifier_register(emc->clk, &emc->clk_nb);
>  	if (err) {
>  		dev_err(&pdev->dev, "failed to register clk notifier: %d\n",
>  			err);
> -		goto put_backup;
> +		goto unset_cb;
>  	}
>  
>  	return 0;
>  
> -put_backup:
> -	clk_put(emc->backup_clk);
> -put_pll_m:
> -	clk_put(emc->pll_m);
>  unset_cb:
>  	tegra20_clk_set_emc_round_callback(NULL, NULL);
>  
> -- 
> 2.22.0
> 

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