| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | What: /sys/bus/i2c/.../idle_state |
| 2 | Date: January 2019 |
| 3 | KernelVersion: 5.2 |
| 4 | Contact: Robert Shearman <robert.shearman@att.com> |
| 5 | Description: |
| 6 | Value that exists only for mux devices that can be |
| 7 | written to control the behaviour of the multiplexer on |
| 8 | idle. Possible values: |
| 9 | -2 - disconnect on idle, i.e. deselect the last used |
| 10 | channel, which is useful when there is a device |
| 11 | with an address that conflicts with another |
| 12 | device on another mux on the same parent bus. |
| 13 | -1 - leave the mux as-is, which is the most optimal |
| 14 | setting in terms of I2C operations and is the |
| 15 | default mode. |
| 16 | 0..<nchans> - set the mux to a predetermined channel, |
| 17 | which is useful if there is one channel that is |
| 18 | used almost always, and you want to reduce the |
| 19 | latency for normal operations after rare |
| 20 | transactions on other channels |