On Thu, 8 Mar 2012, Grant Likely wrote:
Yes, absolutely use separate compatible values. It is always important to be specific as to the silicon implementing the IP.
In that case, it is probably best to use the full chip name in the compatible string, e.g., omap2420 or omap2430 rather than just "omap2". Particularly in the case of "OMAP3," which is a largely meaningless group these days with AM33xx, OMAP34xx, OMAP36xx, and AM3517, many of which are quite different from each other...
- Paul