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Date:	Fri, 21 Mar 2014 15:32:20 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	<linux-fbdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Jim Davis <jim.epost@...il.com>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH] drivers/video: fix mb862xx_i2c depends issue build failure

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.

> Reported-by: Jim Davis <jim.epost@...il.com>
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.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

 Tomi



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