1 What: /sys/bus/i2c/.../idle_state 1 What: /sys/bus/i2c/.../idle_state
2 Date: January 2019 2 Date: January 2019
3 KernelVersion: 5.2 3 KernelVersion: 5.2
4 Contact: Robert Shearman <robert.shearma 4 Contact: Robert Shearman <robert.shearman@att.com>
5 Description: 5 Description:
6 Value that exists only for mux 6 Value that exists only for mux devices that can be
7 written to control the behavio 7 written to control the behaviour of the multiplexer on
8 idle. Possible values: 8 idle. Possible values:
9 9
10 =========== ================= 10 =========== ===============================================
11 -2 disconnect on idl 11 -2 disconnect on idle, i.e. deselect the last used
12 channel, which is 12 channel, which is useful when there is a device
13 with an address t 13 with an address that conflicts with another
14 device on another 14 device on another mux on the same parent bus.
15 -1 leave the mux as- 15 -1 leave the mux as-is, which is the most optimal
16 setting in terms 16 setting in terms of I2C operations and is the
17 default mode. 17 default mode.
18 0..<nchans> set the mux to a 18 0..<nchans> set the mux to a predetermined channel,
19 which is useful i 19 which is useful if there is one channel that is
20 used almost alway 20 used almost always, and you want to reduce the
21 latency for norma 21 latency for normal operations after rare
22 transactions on o 22 transactions on other channels
23 =========== ================= 23 =========== ===============================================
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