[Linux-fbdev-devel] how to support almost compatible boards with one driver ?

[Ghozlane T. <gt...@pr...>]

Hi,

I'm seeking for an advice , related to code cleanness ...

My problem : i'm trying to support 2 "almost" compatible video boards.
the compatible part is ok, the "almost" one is a little bit annoying.

All the registers are the same, with some exeptions:

-increased bitfield size (R [4:0] is now R[6:0] for instance)
-strange things : I have a value, previously stored in one bitfield R1 [7:4]
which is now dispatched in 3 bitfields :
{ R1[24],  R1[7:4],  R2[30] }  R2 being a "new" register added to the
architecture.
(the value was representing a number of 64 pixel wide tiles and to maintain
compatibility, it now reprents the number of .. 32 pixels wide tiles ...)

I think I'm ok with the first type of 'improvment', but i don't really know
how to
cope cleanly with the 2nd type ...

any experiences /  ideas / advices ?

Thank you

ghoz