I'd still say that s5p6442 should be almost identical to other SoCs from s5p64x0 family, but I'll try to look into it today, by comparing sources of s5pcxxx and s5p64x0 from mainline and s5p6442 from G3 kernel.
OK, I checked the sources. It looks like all the chips from S5P series are very similar, but indeed S5P64x0 is closest to S5P6442, so the work should be pointed into adding support of S5P6442 under S5P64x0 tree.
There are some subtle differences in memory map between S5P6442 and S5P6440, but same goes for S5P6450, which is also supported by the same code, so it just has to be extended to account for those differences.
Moreover, documentation for s5pc100, s5pc110 and s5pv210 is available (with little googling), so putting it together with original sources of G3, we can consider the S5P6442 chip as almost fully documented.
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