Not. There is no formal process required for a President to declassify. Think on to, who could make u such a rule? Not congress, so who? Indeed EO's spell out that the President is exempt from any such process.
From EO 13526 signed by Øbama:
Sec. 3.5. Mandatory Declassification Review.
(a) Except as provided in paragraph (b) of this section, all information classified under this order or predecessor orders shall be subject to a review for declassification by the originating agency if:
...
(b) Information originated by the incumbent President or the incumbent Vice President; the incumbent President’s White House Staff or the incumbent Vice President’s Staff; committees, commissions, or boards appointed by the incumbent President; or other entities within the Executive Office of the President that solely advise and assist the incumbent President is exempted from the provisions of paragraph (a) of this section.
obamawhitehouse.archives.gov