linux-kernel - Re: [PATCH 08/18] [media] s5c73m3: Export OF module alias information

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Date:	Fri, 11 Sep 2015 03:19:32 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 08/18] [media] s5c73m3: Export OF module alias information

Hello,

On 08/20/2015 09:07 AM, Javier Martinez Canillas wrote:
> The SPI core always reports the MODALIAS uevent as "spi:<modalias>"
> regardless of the mechanism that was used to register the device
> (i.e: OF or board code) and the table that is used later to match
> the driver with the device (i.e: SPI id table or OF match table).
> 
> So drivers needs to export the SPI id table and this be built into
> the module or udev won't have the necessary information to autoload
> the needed driver module when the device is added.
> 
> But this means that OF-only drivers needs to have both OF and SPI id
> tables that have to be kept in sync and also the dev node compatible
> manufacturer prefix is stripped when reporting the MODALIAS. Which can
> lead to issues if two vendors use the same SPI device name for example.
> 
> To avoid the above, the SPI core behavior may be changed in the future
> to not require an SPI device table for OF-only drivers and report the
> OF module alias. So, it's better to also export the OF table even when
> is unused now to prevent breaking module loading when the core changes.
> 
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> ---
> 
>  drivers/media/i2c/s5c73m3/s5c73m3-spi.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/i2c/s5c73m3/s5c73m3-spi.c b/drivers/media/i2c/s5c73m3/s5c73m3-spi.c
> index fa4a5ebda6b2..9983635ec253 100644
> --- a/drivers/media/i2c/s5c73m3/s5c73m3-spi.c
> +++ b/drivers/media/i2c/s5c73m3/s5c73m3-spi.c
> @@ -31,6 +31,7 @@ static const struct of_device_id s5c73m3_spi_ids[] = {
>  	{ .compatible = "samsung,s5c73m3" },
>  	{ }
>  };
> +MODULE_DEVICE_TABLE(of, s5c73m3_spi_ids;);
>  
>  enum spi_direction {
>  	SPI_DIR_RX,
> 

Any comments about this patch?

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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