What:		/sys/bus/w1/devices/.../w1_master_timeout_us
Date:		April 2015
Contact:	Dmitry Khromov <dk@icelogic.net>
Description:	Bus scanning interval, microseconds component.
		Some of 1-Wire devices commonly associated with physical access
		control systems are attached/generate presence for as short as
		100 ms - hence the tens-to-hundreds milliseconds scan intervals
		are required.
		see Documentation/w1/w1-generic.rst for detailed information.
Users:		any user space application which wants to know bus scanning
		interval