i2c devices on TSC

Hi,

> Oh, I forgot to mention, this configuration gets the snot beat out of it on jklos’s DS25:
> 
>     https://dmesgd.nycbug.org/dmesgd?do=view&id=7447

This reminded me:

  [     1.000000] tsciic0 at tsc0
  [     1.000000] iic0 at tsciic0: I2C bus

that a long time back, I added the tsciic driver and also entries in
GENERIC for the devices on the DS20L.  However, as the entries are
commented out, I guess that almost no-one uses them.  I wonder if there
is a nice way to add them at run time, because we already know the
machine model.

For sparc64, we have direct config and a list of i2c devices from the
firmware, but we also have patching code that adds devices missing from
the firmware tree [*].  This uses the machine model to add or fixup
i2c devices.  I wonder if this latter approach would work here?
I could do this for the DS20L, but is there any interest for other
machines?

Regards,

Julian

[*] sparc64 patching code is:

  https://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/sparc64/sparc64/ofw_patch.c?rev=1.10;content-type=text%2Fx-cvsweb-markup

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