Hi,

I recommend reading the DT spec, chapter 2.3.1 "compatible":
https://github.com/devicetree-org/devicetree-specification/releases/download/v0.3/devicetree-specification-v0.3.pdf

My point is more about, DT validation is not happy about this situation.
For instance when I run dt-validate, do see following:

/home/amit/work/kernel_work/linux/arch/arm64/boot/dts/actions/s700-cubieboard7.dt.yaml:
mmc@e0210000: compatible: Additional items are not allowed
('actions,s700-mmc' was unexpected)

and I am not sure if this is because DT and driver has different
number of compatible strings.

Thanks
Amit