linux-kernel - Re: [PATCH v1 0/2] i2c: muxes: Add GPIO-detected hotplug I2C

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Message-ID: <CAPVz0n3m9VOV5unVHhU67XQnk4jckA+zyJdCHXu2fFxCSht4JQ@mail.gmail.com>
Date: Mon, 15 Sep 2025 14:53:23 +0300
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: Herve Codina <herve.codina@...tlin.com>, Luca Ceresoli <luca@...aceresoli.net>, 
	Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Peter Rosin <peda@...ntia.se>, 
	Michał Mirosław <mirq-linux@...e.qmqm.pl>, 
	Jonas Schwöbel <jonasschwoebel@...oo.de>, 
	linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/2] i2c: muxes: Add GPIO-detected hotplug I2C

пн, 15 вер. 2025 р. о 14:35 Wolfram Sang
<wsa+renesas@...g-engineering.com> пише:
>
> On Mon, Sep 15, 2025 at 09:01:36AM +0300, Svyatoslav Ryhel wrote:
> > 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