dt fragments: dts vs overlay

// modify root node -- normal dts fragment
/ {
    ...
};

// modify root node -- overlay fragment node
/ {
    fragment {
        target-path = "/";
        __overlay__ {
            ...
        };
    };
};


// modify node specified by path -- normal dts fragment
&{/foo/bar} {
    ...
};

// modify node specified by path -- overlay fragment node
/ {
    fragment {
        target-path = "/foo/bar";
        __overlay__ {
            ...
        };
    };
};


// modify labeled node -- normal dts fragment
&some_label {
    ...
};

// modify labeled node -- overlay fragment node
/ {
    fragment {
        target = <&some_label>;
        __overlay__ {
            ...
        };
    };
};