9.2. Device tree syntax
Good format descriptions:
Minimal example
/dts-v1/;
/ {
    a;
};
Check correctness with:
dtc a.dts
Separate nodes are simply merged by node path, e.g.:
/dts-v1/;
/ {
    a;
};
/ {
    b;
};
then dtc a.dts gives:
/dts-v1/;
/ {
        a;
        b;
};