How to encode being an I2C slave in DT?

[Wolfram Sang]

> > I give in to the flag idea. I also noticed that we'd need another flag
> > anyhow to mark 10 bit addresses. I am still thinking between using two
> > address-cells in that case (clean seperation between address and flags)
> > or to encode the flags as MSB in the current address (all busses will
> > have same address-cells and child description, less code paths and no
> > overhead in dtbs).
> 
> Reading thru the thread, this seems good to me. I would go with adding
> flags in the MSB of the reg cell rather than adding a cell.

Thanks. I was leaning to the MSB idea, too, and am currently checking
how the code would look like. Feels much better to do knowing that it is
basically upstream compatible ;)

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