On 12/03/2013 03:18 PM, Stefan Agner wrote:

Depending on the regulator version, the voltage table might be 
different. Use version specific regulator tables in order to
select correct voltage table. For the following regulator versions
different voltage tables are now used:

* TPS658623: Use correct voltage table for SM2 * TPS658643: New
voltage table for SM2

Both versions are in use on the Colibri T20 module. Make use of
the correct tables by requesting the correct SM2 voltage of 1.8V.

This change is not backward compatible since an old driver is not
able to correctly set that value. The value 1.8V is out of range
for the old driver and will refuse to probe the device. The
regulator starts with default settings and the driver shows
appropriate error messages.

On Colibri T20, the old value used to work with TPS658623 since
the driver applied a wrong voltage table too. However, the
TPS658643 used on V1.2 devices uses yet another voltage table and
those broke that pseudo-compatibility. The regulator driver now has
the correct voltage table for both regulator versions and those the
correct voltage can be used in the device tree.

Acked-by: Stephen Warren <redacted>
(yes, taking this through the MFD tree with patch 1/3 makes sense)