-----Original Message-----
From: Mathieu Poirier <mathieu.poirier@linaro.org>
Sent: Wednesday, January 14, 2026 11:09 AM
To: Shenwei Wang <shenwei.wang@nxp.com>
Cc: Linus Walleij <linusw@kernel.org>; Bartosz Golaszewski <brgl@kernel.org>;
Rob Herring [off-list ref]; Krzysztof Kozlowski [off-list ref];
Conor Dooley [off-list ref]; Bjorn Andersson
On Fri, Dec 12, 2025 at 01:43:36PM -0600, Shenwei Wang wrote:

quoted

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.

Never mind. Based on Bjorn’s review comments, I am restructuring the code to use the rpmsg_driver 
model instead of the platform_driver model. 

The virtio‑gpio use case is outside the scope of this patch set, since those devices are exposed over
the rpmsg bus.

Regards,
Shenwei

quoted

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