18c2ecf20Sopenharmony_ciWhat:		/sys/bus/mmc/devices/.../rev
28c2ecf20Sopenharmony_ciDate:		October 2017
38c2ecf20Sopenharmony_ciContact:	Jin Qian <jinqian@android.com>
48c2ecf20Sopenharmony_ciDescription:	Extended CSD revision number
5