Orange Pi5 kernel

What:		/sys/bus/i2c/.../idle_state
Date:		January 2019
KernelVersion:	5.2
Contact:	Robert Shearman <robert.shearman@att.com>
Description:
<------><------>Value that exists only for mux devices that can be
<------><------>written to control the behaviour of the multiplexer on
<------><------>idle. Possible values:
 
<------><------>===========  ===============================================
<------><------>-2	     disconnect on idle, i.e. deselect the last used
<------><------><------>     channel, which is useful when there is a device
<------><------><------>     with an address that conflicts with another
<------><------><------>     device on another mux on the same parent bus.
<------><------>-1	     leave the mux as-is, which is the most optimal
<------><------><------>     setting in terms of I2C operations and is the
<------><------><------>     default mode.
<------><------>0..<nchans>  set the mux to a predetermined channel,
<------><------><------>     which is useful if there is one channel that is
<------><------><------>     used almost always, and you want to reduce the
<------><------><------>     latency for normal operations after rare
<------><------><------>     transactions on other channels
<------><------>===========  ===============================================