Hi Bart,

> Yes, in that case it seems to me it needs a separate virtual device
> driving it. In general, the idea Markus presented is fine but it must
> not be described in DT. Instead, you need to create an auxiliary
> device from subsystem code.

Okay, I get it that it should not be described in DT. DT should only
have standard i2c-gpio busses and the OS needs to figure the details,
right?

I wonder about the subsystem involvement, though. The I2C core doesn't
care about the scl-gpios property (except for GPIO recovery which is
moot with the i2c-gpio driver). So, maybe this should be handled in the
i2c-gpio driver instead?

All the best,

   Wolfram