[linux-dvb] Re: CX88 i2c issue w/ DVB tuners

[Gerd Knorr <kraxel@bytesex.org>]

Ralph Metzler <rjkm@metzlerbros.de> writes:

> I think before (a year or so ago) when possible improvements 
> of the kernel i2c driver for DVB were discussed on this list 
> one of the ideas was to add a type field to the i2c client. 
> Something like I2C_DVB_DEMOD, I2C_DVB_TUNER, I2C_ANALOG_TUNER, 
> I2C_ANALOG_SOUND_THINGY_GADGET, etc.
> The i2c driver could then choose in the attach function what kind of
> clients to accept and how to configure them.

We have something like that now in the mainline kernel: the .class
field in both adapters and clients which can be used to figure
whenever attaching makes sense or not.  That helps reducing address
clashes alot and was actually added for dvb because it was a real-live
issue that lm_sensor chips probed on the dvb i2c bus and confused the
frontends by doing so.

It doesn't help through in the case we have a conflict between analog
+ digital tuner chips and tv cards which can do both analog + digital
TV ...

  Gerd

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