пн, 15 вер. 2025 р. о 14:35 Wolfram Sang
[off-list ref] пише:

On Mon, Sep 15, 2025 at 09:01:36AM +0300, Svyatoslav Ryhel wrote:

quoted

Implement driver for hot-plugged I2C busses, where some devices on
a bus are hot-pluggable and their presence is indicated by GPIO line.
This feature is used by the ASUS Transformers family, by the  Microsoft
Surface RT/2 and maybe more.

ASUS Transformers expose i2c line via proprietary 40 pin plug and wire
that line through optional dock accessory. Devices in the dock are
connected to this i2c line and docks presence is detected by a dedicted
GPIO.

Michał Mirosław (1):
  i2c: muxes: Add GPIO-detected hotplug I2C

Svyatoslav Ryhel (1):
  dt-bindings: i2c: Document GPIO detected hot-plugged I2C bus

 .../bindings/i2c/i2c-hotplug-gpio.yaml        |  65 +++++
 drivers/i2c/muxes/Kconfig                     |  11 +
 drivers/i2c/muxes/Makefile                    |   1 +
 drivers/i2c/muxes/i2c-hotplug-gpio.c          | 263 ++++++++++++++++++
 4 files changed, 340 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-hotplug-gpio.yaml
 create mode 100644 drivers/i2c/muxes/i2c-hotplug-gpio.c

Adding Herve and Luca to CC because they want to achieve the same with
their I2C bus extensions, no?

I have no idea what you are talking about, this an original series I
have sent 2 years ago but now I decided that would be nice to have it
in mainline Linux.  Here is a link to patchset from 19th Jun 2023
https://lkml.org/lkml/2023/6/19/781