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.

The W1 code hasn't seen too much activity in recent time and has seen some drivers removed like the Maxim DS1WM 1-wire driver for some old HP iPAQ devices. Krzysztof Kozlowski with Linaro though has now collected a set of W1 driver updates including some patches going back around a year and a half. Those patches are going to be merged for the Linux 6.5 kernel this summer.

These 1-wire bus driver patches provide several older clean-ups, various minor improvements, and an assortment of different fixes.

More details on these changes for those interested via the 1-wire pull to char/misc ahead of the Linux 6.5 merge window opening up in about one month.

More information on the W1 subsystem can be found via the kernel.org docs .