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

[Thierry Reding]

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 <dig...@gmail.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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