SoC platforms or subarchitectures should follow all the rules from Documentation/process/maintainer-soc.rst. This document referenced in MAINTAINERS impose additional requirements listed below.
No changes to the SoC platform Devicetree sources (DTS files) should introduce
new make dtbs_check W=1 warnings. Warnings in a new board DTS, which are
results of issues in an included DTSI file, are considered existing, not new
warnings. The platform maintainers have automation in place which should point
out any new warnings.
If a commit introducing new warnings gets accepted somehow, the resulting issues shall be fixed in reasonable time (e.g. within one release) or the commit reverted.