linux-kernel - Re: [PATCH] spi: rspi: fix build error when CONFIG

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Date:	Tue, 4 Feb 2014 14:56:40 +0900
From:	"Shimoda, Yoshihiro" <yoshihiro.shimoda.uh@...esas.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>
CC:	Mark Brown <broonie@...nel.org>, <linux-spi@...r.kernel.org>,
	SH-Linux <linux-sh@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] spi: rspi: fix build error when CONFIG_OF is not set

Hi Geert-san,

(2014/02/03 17:47), Geert Uytterhoeven wrote:
> 	Hi Shimoda-san,
> 
> On Mon, 3 Feb 2014, Shimoda, Yoshihiro wrote:
>> This patch fixes an issue that the following build error happens when
>> the CONFIG_OF is not set:
>>
>> drivers/spi/spi-rspi.c: In function 'rspi_probe':
>> drivers/spi/spi-rspi.c:1203:26: error: 'rspi_of_match' undeclared (first use in this function)
>>
>> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
>> ---
>>  This patch is based on the latest origin/topic/rspi branch in the spi.git.
>>
>>  drivers/spi/spi-rspi.c |    1 +
>>  1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
>> index 34ad4bc..e5cfc3d 100644
>> --- a/drivers/spi/spi-rspi.c
>> +++ b/drivers/spi/spi-rspi.c
>> @@ -1164,6 +1164,7 @@ static int rspi_parse_dt(struct device *dev, struct spi_master *master)
>>  	return 0;
>>  }
>>  #else
>> +#define rspi_of_match	NULL
>>  static inline int rspi_parse_dt(struct device *dev, struct spi_master *master)
>>  {
>>  	return -EINVAL;
>> -- 
>> 1.7.1
> 
> Thanks, obviously I missed that of_match_device() still uses the ID table
> parameter if CONFIG_OF=n :-(
> 
> Below I have two alternative solutions:
>   1. Uses rspi_of_match() to nullify the ID table pointer, like is done in
>      the platform_driver structure,
>   2. Fixes it at the OF subsystem level, by nullifying the ID table pointer
>      inside of_match_device().
> 
> If 2 is accepted, drivers don't have to care about this anymore.
> 
> What do you think?

Thank you for the reply.
I think the 2nd one is a nice idea.
If I applied it without my patch, the build error disappeared.

Best regards,
Yoshihiro Shimoda
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