/**
 * @brief Communication port capability that a device is supported natively, 
 *          or able to emulate low level serial transmission behaviour specify 
 *          by POSIX1-2008, section 11.
 * 
 */
potens(TERMPORT),

/**
 * @brief Hardware timer capability that allow such device to be integrated
          and utilised by timer subsystem
 * 
 */
potens(HWTIMER),

/**
 * @brief RTC capability.
 * 
 */
potens(HWRTC),