Should DVB depend on I2C?

[Daniel Drake <dsd@gentoo.org>]

> Got the following compile error :
> 
>   LD      .tmp_vmlinux1
> drivers/built-in.o: In function `tda8083_writereg':
> drivers/media/dvb/frontends/tda8083.c:69: undefined reference to `i2c_transfer'
> drivers/built-in.o: In function `tda8083_readregs':
> drivers/media/dvb/frontends/tda8083.c:84: undefined reference to `i2c_transfer'
> drivers/built-in.o: In function `l64781_writereg':
> drivers/media/dvb/frontends/l64781.c:60: undefined reference to `i2c_transfer'
> drivers/built-in.o: In function `l64781_readreg':
> drivers/media/dvb/frontends/l64781.c:75: undefined reference to `i2c_transfer'
> drivers/built-in.o: In function `reset_and_configure':
> drivers/media/dvb/frontends/l64781.c:119: undefined reference to `i2c_transfer'
> drivers/built-in.o:drivers/media/dvb/frontends/l64781.c:524: more undefined references to `i2c_transfer' follow
> make: *** [.tmp_vmlinux1] Error 1
> 
> .config is attached

Still waiting on a response at 
http://marc.theaimsgroup.com/?l=linux-video&m=114787670927881&w=2

Oh wait, there was one, but apparently I wasn't CC'd. Adding the right 
list now.

DVB people:

Attila Stehr in a Gentoo bug report pointed out that the DVB frontends
do not link without CONFIG_I2C, and there is no dependency listed in the
Kconfig files.

e.g.:
drivers/built-in.o: In function `stv0299_readregs':
stv0299.c:(.text+0xa4d8a): undefined reference to `i2c_transfer'

I checked and I see this is the case for other DVB components too, such
as the dvb-usb drivers.

I'm happy to patch this, but I'm not sure which approach should be best. 
Should I make CONFIG_DVB or CONFIG_DVB_CORE depend on I2C, or should I 
modify the config blocks for all of the individual options which use I2C 
stuff?

Thanks,
Daniel