> -Original Message-
> From: Mathieu Poirier
> Sent: Wednesday, January 14, 2026 11:09 AM
> To: Shenwei Wang
> Cc: Linus Walleij ; Bartosz Golaszewski ;
> Rob Herring ; Krzysztof Kozlowski ;
> Conor Dooley ; Bjorn Andersson
> 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.
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
>
> > 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
> >
