1-Wire "w1" Subsystem Seeing More Activity With Linux 6.5

[phoronix]

Phoronix: 1-Wire "w1" Subsystem Seeing More Activity With Linux 6.5

The Linux 1-Wire "w1" subsystem is used for supporting drivers with hardware that communicates via a single wire (plus ground) in a simple master-slave configuration The Linux kernel has drivers such as for W1 over GPIO, i2c to W1 bridge, and supporting some very old hardware. The W1 subsystem hasn't seen much work recently while for the upcoming Linux 6.5 cycle will be seeing a larger update...

https://www.phoronix.com/news/Linux-1-Wire-W1-2023

[Jakobson]

So, w1 is basically pretty old telegraph?

[stormcrow]

So, w1 is basically pretty old telegraph?

If you mean the single wire earth-return telegraph then yes. It's the same basic concept that underlies all modern synchronous serial communications just distilled back to its single fundamental element. Old doesn't mean obsolete.

[willmore]

So, w1 is basically pretty old telegraph?

This sounds more like Dallas's One-Wire system that they've had for decades. It's a clever way to use 1 I/O pin to talk to a large number of very low bandwidth nodes--they can be sensors, memories(RAM or ROM), or some combo of all the above. One of the more common devices is as a temperature sensor as you can put many of them around your device and only use one signal line.

[timofonic]

Who uses it? People say it's obsolete... https://support.xilinx.com/s/questio...language=en_US

There's one wire Can and Lin too.