linux-kernel - Re: [PATCH v6 0/5] Enable Remote GPIO over RPMSG on i.MX Platform

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Message-ID: <aWfNsrpC5Rgiwwp3@p14s>
Date: Wed, 14 Jan 2026 10:09:06 -0700
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Shenwei Wang <shenwei.wang@....com>
Cc: Linus Walleij <linusw@...nel.org>,
	Bartosz Golaszewski <brgl@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Peng Fan <peng.fan@....com>,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, linux-imx@....com
Subject: Re: [PATCH v6 0/5] Enable Remote GPIO over RPMSG on i.MX Platform

On Fri, Dec 12, 2025 at 01:43:36PM -0600, Shenwei Wang wrote:
> Support the remote devices on the remote processor via the RPMSG bus on
> i.MX platform.
> 
> Changes in v6:
>  - make the driver more generic with the actions below:
>      rename the driver file to gpio-rpmsg.c
>      remove the imx related info in the function and variable names
>      rename the imx_rpmsg.h to rpdev_info.h
>      create a gpio-rpmsg.yaml and refer it in imx_rproc.yaml
>  - update the gpio-rpmsg.rst according to the feedback from Andrew and
>    move the source file to driver-api/gpio
>  - fix the bug reported by Zhongqiu Han
>  - remove the I2C related info
>

NAK - I asked to use the virtio interface (in this case virtio-gpio), something
I do not see in the above summary and the first 2 patches in this series.  This
work will not move forward until that happens.
 
> Changes in v5:
>  - move the gpio-rpmsg.rst from admin-guide to staging directory after
>    discussion with Randy Dunlap.
>  - add include files with some code improvements per Bartosz's comments.
> 
> Changes in v4:
>  - add a documentation to describe the transport protocol per Andrew's
>    comments.
>  - add a new handler to get the gpio direction.
> 
> Changes in v3:
>  - fix various format issue and return value check per Peng 's review
>    comments.
>  - add the logic to also populate the subnodes which are not in the
>    device map per Arnaud's request. (in imx_rproc.c)
>  - update the yaml per Frank's review comments.
> 
> Changes in v2:
>  - re-implemented the gpio driver per Linus Walleij's feedback by using
>    GPIOLIB_IRQCHIP helper library.
>  - fix various format issue per Mathieu/Peng 's review comments.
>  - update the yaml doc per Rob's feedback
> 
> Shenwei Wang (5):
>   dt-bindings: remoteproc: imx_rproc: Add "rpmsg" subnode support
>   remoteproc: imx_rproc: Populate devices under "rpmsg" subnode
>   docs: driver-api: gpio: generic gpio driver over rpmsg bus
>   gpio: rpmsg: add generic rpmsg GPIO driver
>   arm64: dts: imx8ulp: Add rpmsg node under imx_rproc
> 
>  .../devicetree/bindings/gpio/gpio-rpmsg.yaml  |  49 ++
>  .../bindings/remoteproc/fsl,imx-rproc.yaml    |  54 ++
>  Documentation/driver-api/gpio/gpio-rpmsg.rst  | 232 +++++++++
>  Documentation/driver-api/gpio/index.rst       |   1 +
>  arch/arm64/boot/dts/freescale/imx8ulp.dtsi    |  27 +
>  drivers/gpio/Kconfig                          |  16 +
>  drivers/gpio/Makefile                         |   1 +
>  drivers/gpio/gpio-rpmsg.c                     | 490 ++++++++++++++++++
>  drivers/remoteproc/imx_rproc.c                | 143 +++++
>  include/linux/rpmsg/rpdev_info.h              |  33 ++
>  10 files changed, 1046 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-rpmsg.yaml
>  create mode 100644 Documentation/driver-api/gpio/gpio-rpmsg.rst
>  create mode 100644 drivers/gpio/gpio-rpmsg.c
>  create mode 100644 include/linux/rpmsg/rpdev_info.h
> 
> --
> 2.43.0
>