linux-kernel - Re: [PATCH v2] counter/ftm-quaddec: Use device-managed registration API

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Message-ID: <CAKKE0ZFgdiViNiHD2KXvJAW4MB+0T2BM0-k+2UYWubTRHN9Sww@mail.gmail.com>
Date:   Mon, 29 Jul 2019 13:52:47 +0200
From:   Patrick Havelange <patrick.havelange@...ensium.com>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] counter/ftm-quaddec: Use device-managed registration API

On Fri, Jul 26, 2019 at 3:39 PM Chuhong Yuan <hslester96@...il.com> wrote:
>
> Make use of devm_counter_register.
> Then we can remove redundant unregistration API
> usage to make code simpler.
>
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>

Reviewed-by: Patrick Havelange <patrick.havelange@...ensium.com>

Maybe a bit too late, sorry for that. Thanks for the patch.

Patrick H.

> ---
> Changes in v2:
>   - Use devm_add_action_or_reset to keep
>     resource release order.
>   - remove() function is redundant now,
>     delete it.
>
>  drivers/counter/ftm-quaddec.c | 30 ++++++++++++------------------
>  1 file changed, 12 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c
> index 68a9b7393457..4046aa9f9234 100644
> --- a/drivers/counter/ftm-quaddec.c
> +++ b/drivers/counter/ftm-quaddec.c
> @@ -100,16 +100,18 @@ static void ftm_quaddec_init(struct ftm_quaddec *ftm)
>         ftm_set_write_protection(ftm);
>  }
>
> -static void ftm_quaddec_disable(struct ftm_quaddec *ftm)
> +static void ftm_quaddec_disable(void *ftm)
>  {
> -       ftm_clear_write_protection(ftm);
> -       ftm_write(ftm, FTM_MODE, 0);
> -       ftm_write(ftm, FTM_QDCTRL, 0);
> +       struct ftm_quaddec *ftm_qua = ftm;
> +
> +       ftm_clear_write_protection(ftm_qua);
> +       ftm_write(ftm_qua, FTM_MODE, 0);
> +       ftm_write(ftm_qua, FTM_QDCTRL, 0);
>         /*
>          * This is enough to disable the counter. No clock has been
>          * selected by writing to FTM_SC in init()
>          */
> -       ftm_set_write_protection(ftm);
> +       ftm_set_write_protection(ftm_qua);
>  }
>
>  static int ftm_quaddec_get_prescaler(struct counter_device *counter,
> @@ -317,20 +319,13 @@ static int ftm_quaddec_probe(struct platform_device *pdev)
>
>         ftm_quaddec_init(ftm);
>
> -       ret = counter_register(&ftm->counter);
> +       ret = devm_add_action_or_reset(&pdev->dev, ftm_quaddec_disable, ftm);
>         if (ret)
> -               ftm_quaddec_disable(ftm);
> -
> -       return ret;
> -}
> +               return ret;
>
> -static int ftm_quaddec_remove(struct platform_device *pdev)
> -{
> -       struct ftm_quaddec *ftm = platform_get_drvdata(pdev);
> -
> -       counter_unregister(&ftm->counter);
> -
> -       ftm_quaddec_disable(ftm);
> +       ret = devm_counter_register(&pdev->dev, &ftm->counter);
> +       if (ret)
> +               return ret;
>
>         return 0;
>  }
> @@ -346,7 +341,6 @@ static struct platform_driver ftm_quaddec_driver = {
>                 .of_match_table = ftm_quaddec_match,
>         },
>         .probe = ftm_quaddec_probe,
> -       .remove = ftm_quaddec_remove,
>  };
>
>  module_platform_driver(ftm_quaddec_driver);
> --
> 2.20.1
>