On Fri, Nov 09, 2012 at 03:00:20PM +0100, Steffen Trumtrar wrote:

• This breaks compatibility with user space applications between non-DT and DT.

• On platforms that are in between DT and non-DT, it breaks registration of devices via spi_board_info.

Use the same method as 7e6086d9e54a159a6257c02bb7fc5805c614aad2 does for gpios: Use alias to identify the spi port, and then specify the base via the port id. If alias is not defined in DT, allocate the base dynamically.

This sounds like a fix userspace and/or complete your DT conversion problem...