linux-kernel - Re: [PATCH] mfd: mt6397: Add platform device ID table

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Date:	Wed, 10 Feb 2016 16:19:44 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: mt6397: Add platform device ID table

On Tue, 09 Feb 2016, Javier Martinez Canillas wrote:

> The platform bus_type .match callback attempts to match the platform device
> name with an entry on the .id_table if provided and fallbacks to match with
> the driver's name if a table is not provided.
> 
> Using a platform device ID to match is more explicit, allows the driver to
> support more than one device and also the MODULE_DEVICE_TABLE macro can be
> used to export the module aliases information instead of the MODULE_ALIAS.
> 
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> 
> ---
> 
>  drivers/mfd/mt6397-core.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
> index 1749c1c9f405..11c28caf4e5a 100644
> --- a/drivers/mfd/mt6397-core.c
> +++ b/drivers/mfd/mt6397-core.c
> @@ -275,6 +275,12 @@ static const struct of_device_id mt6397_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, mt6397_of_match);
>  
> +static const struct platform_device_id mt6397_id[] = {
> +	{"mt6397", 0},

Please insert spaces at both ends.

> +	{ /* sentinel */ },

We know what a NULL entry does.  No need for the comment.

> +};
> +MODULE_DEVICE_TABLE(platform, mt6397_id);
> +
>  static struct platform_driver mt6397_driver = {
>  	.probe = mt6397_probe,
>  	.remove = mt6397_remove,
> @@ -283,6 +289,7 @@ static struct platform_driver mt6397_driver = {
>  		.of_match_table = of_match_ptr(mt6397_of_match),
>  		.pm = &mt6397_pm_ops,
>  	},
> +	.id_table = mt6397_id,
>  };
>  
>  module_platform_driver(mt6397_driver);
> @@ -290,4 +297,3 @@ module_platform_driver(mt6397_driver);
>  MODULE_AUTHOR("Flora Fu, MediaTek");
>  MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC");
>  MODULE_LICENSE("GPL");
> -MODULE_ALIAS("platform:mt6397");

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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