<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def home_plunger(self, mount: top_types.Mount):
 """ Home the plunger motor for a mount, and then return it to the 'bottom' position. :param mount: the mount associated with the target plunger :type mount: :py:class:`.top_types.Mount` """

        instr = self._attached_instruments[mount]
        if instr:
            await self.home([Axis.of_plunger(mount)])
            await self._move_plunger(mount,
                                     instr.config.bottom)