All cities and towns shall, by ordinance, establish a planning board or commission under the provisions of this chapter. Any city or town operating under a home rule charter which provides for the establishment of a planning board or commission may continue under the provisions of that charter, except that the provisions of § 45-22-7, governing the formulation and adoption of a comprehensive plan and the duties of a planning board or commission, apply to all cities and towns.
R.I. Gen. Laws § 45-22-1