I've just been discussing how this relates to rk29xx on #etnaviv.  I 
looked through the patch and it's good to see it's not limited to 
supporting Mali GPUs.  I see no reason this wouldn't be compatible 
with etna_viv for rk29xx (or future Rockchip designs with alternative 
GPUs) as long as the rest of the infrastructure to support rk29 is in 
place iommu (ARM SMMU?) driver, for example.

IMHO it's vital to keep a logical separation between the video display 
hardware and the graphics processor on SoCs.