On Thu, May 05, 2016 at 06:39:32PM +0800, Garlic Tseng wrote:

As mentioned above, the difference of the ASoCs between the two chips
are too large that we have a hard time sharing the driver code.

The things you're describing all sound like scaling differences rather
than fundamental changes.  I'd expect to see at least some shared code
here, we don't want to be just duplicating the entire driver every time
there's a new hardware revision.
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