[PATCH v13 0/4] Enable Remote GPIO over RPMSG on i.MX Platform

[Shenwei Wang]

> -----Original Message-----
> From: Mathieu Poirier <mathieu.poirier at linaro.org>
> Sent: Thursday, April 23, 2026 7:53 AM
> To: Shenwei Wang <shenwei.wang at nxp.com>; Andrew Lunn <andrew at lunn.ch>
> Cc: Linus Walleij <linusw at kernel.org>; Bartosz Golaszewski <brgl at kernel.org>;
> Jonathan Corbet <corbet at lwn.net>; Rob Herring <robh at kernel.org>; Krzysztof
> Kozlowski <krzk+dt at kernel.org>; Conor Dooley <conor+dt at kernel.org>; Bjorn
> Andersson <andersson at kernel.org>; Frank Li <frank.li at nxp.com>; Sascha Hauer
> <s.hauer at pengutronix.de>; Shuah Khan <skhan at linuxfoundation.org>; linux-
> 
> Once again Andrew Lunn was left out.
> 

Seems an issue of get_maintainer.pl, but he is included in the thread for the gpio‑rpmsg driver patch..
Cc: Andrew Lunn <andrew at lunn.ch>

> On Wed, 22 Apr 2026 at 15:29, Shenwei Wang <shenwei.wang at nxp.com>
> wrote:
> >
> > Support the remote devices on the remote processor via the RPMSG bus
> > on i.MX platform.
> >
> > Changes in v13:
> >  - drop the support for legacy NXP firmware.
> >  - remove the fixed_up hooks from the rpmsg gpio driver.
> >  - code cleanup.
> >
> > Changes in v12:
> >  - Fixed the "underline" warning reported by Randy.
> >
> > Changes in v11:
> >  - Expand RPMSG for the first time per Shuah's review comment.
> >
> > Changes in v10:
> >  - Update gpio-rpmsg.rst according to Daniel Baluta's review comments.
> >  - Add a kernel CONFIG for fixed up handlers and only enable it on
> >    i.MX products.
> >  - Fixed bugs reported by kernel test robot.
> >
> > Changes in v9:
> >  - Reuse the gpio-virtio design for command and IRQ type definitions.
> >  - Remove msg_id, version, and vendor fields from the generic protocol.
> >  - Add fixed-up handlers to support legacy firmware.
> >
> > Changes in v8:
> >  - Add "depends on REMOTEPROC" in Kconfig to fix the build error reported
> >    by the kernel test robot.
> >  - Move the .rst patch before the .yaml patch.
> >  - Handle the "ngpios" DT property based on Andrew's feedback.
> >
> > Changes in v7:
> >  - Reworked the driver to use the rpmsg_driver framework instead of
> >    platform_driver, based on feedback from Bjorn and Arnaud.
> >  - Updated gpio-rpmsg.yaml and imx_rproc.yaml according to comments from
> >    Rob and Arnaud.
> >  - Further refinements to gpio-rpmsg.yaml per Arnaud's feedback.
> >
> > 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
> >
> > 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 (4):
> >   docs: driver-api: gpio: rpmsg gpio driver over rpmsg bus
> >   dt-bindings: remoteproc: imx_rproc: Add "rpmsg" subnode support
> >   gpio: rpmsg: add generic rpmsg GPIO driver
> >   arm64: dts: imx8ulp: Add rpmsg node under imx_rproc
> >
> >  .../devicetree/bindings/gpio/gpio-rpmsg.yaml  |  55 ++
> >  .../bindings/remoteproc/fsl,imx-rproc.yaml    |  53 ++
> >  Documentation/driver-api/gpio/gpio-rpmsg.rst  | 266 ++++++++
> >  Documentation/driver-api/gpio/index.rst       |   1 +
> >  arch/arm64/boot/dts/freescale/imx8ulp.dtsi    |  25 +
> >  drivers/gpio/Kconfig                          |  17 +
> >  drivers/gpio/Makefile                         |   1 +
> >  drivers/gpio/gpio-rpmsg.c                     | 573 ++++++++++++++++++
> >  8 files changed, 991 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
> >
> > --
> > 2.43.0
> >