From: Randy Dunlap <rdunlap@infradead.org>
To: Paul Gortmaker <paul.gortmaker@windriver.com>,
Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Jim Davis <jim.epost@gmail.com>,
Fengguang Wu <fengguang.wu@intel.com>
Subject: Re: [PATCH] drivers/video: fix mb862xx_i2c depends issue build failure
Date: Fri, 21 Mar 2014 23:11:03 +0000 [thread overview]
Message-ID: <532CC707.9010405@infradead.org> (raw)
In-Reply-To: <532C4476.2030706@windriver.com>
On 03/21/2014 06:53 AM, Paul Gortmaker wrote:
> On 14-03-21 09:32 AM, Tomi Valkeinen wrote:
>> Hi,
>>
>> On 20/03/14 17:16, Paul Gortmaker wrote:
>>> Any randconfig that sets I2C=m and FB_MB862XX_I2C=y will
>>> encounter a final link failure that looks like this:
>>
>> It compiles fine with I2C=m, FB_MB862XX=m and FB_MB862XX_I2C=y.
>>
>>> drivers/built-in.o: In function `mb862xx_i2c_init':
>>> drivers/video/mb862xx/mb862xx-i2c.c:165: undefined reference to `i2c_add_adapter'
>>> drivers/built-in.o: In function `mb862xx_i2c_exit':
>>> drivers/video/mb862xx/mb862xx-i2c.c:176: undefined reference to `i2c_del_adapter'
>>>
>>> Since FB_MB862XX_I2C is a bool and not tristate, simply
>>> don't offer it at all if core I2C support is not built in.
>>
>> FB_MB862XX_I2C is not a driver, it just adds the i2c support to
>> FB_MB862XX. The relevant thing is whether FB_MB862XX is m or y, so
>> compiling with:
>>
>> I2C=m, FB_MB862XX=y and FB_MB862XX_I2C=y
>>
>> will fail.
>
> How would you suggest we fix it then? Perhaps we could simplify the
> Kconfig space and just get rid of FB_MB862XX_I2C entirely? Is there
> ever a reason why someone would want it turned off when I2C is present?
>
> Paul.
> --
>
>>
>>> Reported-by: Jim Davis <jim.epost@gmail.com>
>>> Reported-by: Fengguang Wu <fengguang.wu@intel.com>
>>> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
>>>
>>> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
>>> index dade5b7699bc..aefd1b9a3cbd 100644
>>> --- a/drivers/video/Kconfig
>>> +++ b/drivers/video/Kconfig
>>> @@ -2338,7 +2338,7 @@ endchoice
>>>
>>> config FB_MB862XX_I2C
>>> bool "Support I2C bus on MB862XX GDC"
>>> - depends on FB_MB862XX && I2C
>>> + depends on FB_MB862XX && I2C=y
>>> default y
>>> help
>>> Selecting this option adds Coral-P(A)/Lime GDC I2C bus adapter
>>
>> This fix is not correct, as it prevents the following, valid, config:
>>
>> I2C=m, FB_MB862XX=m and FB_MB862XX_I2C=y
If I am following this correctly, this kconfig situation is often handled
by something like
depends on I2C=y || I2Cû_MB862XX
--
~Randy
prev parent reply other threads:[~2014-03-21 23:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-20 15:16 [PATCH] drivers/video: fix mb862xx_i2c depends issue build failure Paul Gortmaker
2014-03-21 13:32 ` Tomi Valkeinen
2014-03-21 13:53 ` Paul Gortmaker
2014-03-21 14:07 ` Tomi Valkeinen
2014-03-21 23:11 ` Randy Dunlap [this message]
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