Support the remote devices on the remote processor via the RPMSG bus on
i.MX platform.

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 (5):
  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
  gpio: rpmsg: add support for NXP legacy firmware protocol
  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                          |  32 +
 drivers/gpio/Makefile                         |   1 +
 drivers/gpio/gpio-rpmsg.c                     | 743 ++++++++++++++++++
 8 files changed, 1176 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

Hi Shenwei,

On Fri, Mar 13, 2026 at 8:58 PM Shenwei Wang <shenwei.wang@nxp.com> wrote:

> Support the remote devices on the remote processor via the RPMSG bus on
> i.MX platform.

I think v12 looks pretty good, if Arnaud gives his ACK on this patch
series I think it's ripe for merge.

Yours,
Linus Walleij

[Adding Andrew Lunn]

On Mon, 16 Mar 2026 at 08:23, Linus Walleij <linusw@kernel.org> wrote:
>
> Hi Shenwei,
>
> On Fri, Mar 13, 2026 at 8:58 PM Shenwei Wang <shenwei.wang@nxp.com> wrote:
>
> > Support the remote devices on the remote processor via the RPMSG bus on
> > i.MX platform.
>
> I think v12 looks pretty good, if Arnaud gives his ACK on this patch
> series I think it's ripe for merge.

Please wait until Andrew and I have provided our RBs before merging.

>
> Yours,
> Linus Walleij

On Mon, Mar 16, 2026 at 5:01 PM Mathieu Poirier
<mathieu.poirier@linaro.org> wrote:
> [Adding Andrew Lunn]
>
> On Mon, 16 Mar 2026 at 08:23, Linus Walleij <linusw@kernel.org> wrote:
> >
> > Hi Shenwei,
> >
> > On Fri, Mar 13, 2026 at 8:58 PM Shenwei Wang <shenwei.wang@nxp.com> wrote:
> >
> > > Support the remote devices on the remote processor via the RPMSG bus on
> > > i.MX platform.
> >
> > I think v12 looks pretty good, if Arnaud gives his ACK on this patch
> > series I think it's ripe for merge.
>
> Please wait until Andrew and I have provided our RBs before merging.

Fair enough, I think either you will all agree or none of you anyway.

Yours,
Linus Walleij