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

Once again Andrew Lunn was left out.

On Wed, 22 Apr 2026 at 15:29, Shenwei Wang <shenwei.wang@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
>

On Thu, Apr 23, 2026 at 06:53:12AM -0600, Mathieu Poirier wrote:
> Once again Andrew Lunn was left out.
> 
> On Wed, 22 Apr 2026 at 15:29, Shenwei Wang <shenwei.wang@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.

That looks like a step forward. Now we don't care about legacy NXP
firmware, it makes it easier to make bigger changes, like use the
messages format from gpio-virtio.

	 Andrew