dtsi vs dts files, where to better understand this

Hi,

I've done some digging and not found any info, maybe I looked in the
wrong places.

I'm trying to better understand how the dtsi file works with the dts
file and what can go in each file.

Our SOC has the same issues as everyone else where we don't want to
replicate stuff across a bunch of device trees.

Thanks,
John

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