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

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Message-ID: <aMf6DLr8pTCP8tKn@shikoro>
Date: Mon, 15 Sep 2025 13:35:40 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Svyatoslav Ryhel <clamor95@...il.com>,
	Herve Codina <herve.codina@...tlin.com>,
	Luca Ceresoli <luca@...aceresoli.net>
Cc: 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

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?


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