linux-kernel - Re: [PATCH] mfd: sec: initialize driver via module_platform

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Date:   Tue, 22 Sep 2020 10:04:25 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Sangbeom Kim <sbkim73@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH] mfd: sec: initialize driver via module_platform_driver

Hi Krzysztof,

On 21.09.2020 22:34, Krzysztof Kozlowski wrote:
> The driver was using subsys_initcall() because in old times deferred
> probe was not supported everywhere and specific ordering was needed.
> Since probe deferral works fine and specific ordering is discouraged
> (hides dependencies between drivers and couples their boot order), the
> driver can be converted to regular module_platform_driver.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>   drivers/mfd/sec-core.c | 14 +-------------
>   1 file changed, 1 insertion(+), 13 deletions(-)
>
> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
> index 95473ff9bb4b..8d55992da19e 100644
> --- a/drivers/mfd/sec-core.c
> +++ b/drivers/mfd/sec-core.c
> @@ -549,19 +549,7 @@ static struct i2c_driver sec_pmic_driver = {
>   	.shutdown = sec_pmic_shutdown,
>   	.id_table = sec_pmic_id,
>   };
> -
> -static int __init sec_pmic_init(void)
> -{
> -	return i2c_add_driver(&sec_pmic_driver);
> -}
> -
> -subsys_initcall(sec_pmic_init);
> -
> -static void __exit sec_pmic_exit(void)
> -{
> -	i2c_del_driver(&sec_pmic_driver);
> -}
> -module_exit(sec_pmic_exit);
> +module_i2c_driver(sec_pmic_driver);
>   
>   MODULE_AUTHOR("Sangbeom Kim <sbkim73@...sung.com>");
>   MODULE_DESCRIPTION("Core support for the S5M MFD");

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland