Re: [PATCH v15 0/5] Enable Remote GPIO over RPMSG on i.MX Platform

I won't be able to review this patchset until the week starting August 17th.

On Tue, 21 Jul 2026 at 14:48, Shenwei Wang <[email protected]> wrote:
>
> Support the remote devices on the remote processor via the RPMSG bus on
> i.MX platform.
>
> Changes in v15:
>  - Update Kconfig description per AndrewD and Julian's feedback
>  - Enable the GPIO driver even without a DT node per AndrewD's feedback
>  - Update gpio-rpmsg.rst per Mathieu’s feedback
>  - Code cleanup according the new gpio-rpmsg.rst and sashiko-bot's review
>    feedback
>
> Changes in v14:
>  - Update gpio-rpmsg.rst per Mathieu’s feedback.
>  - Align the rpmsg-gpio driver with the revised gpio-rpmsg.rst.
>  - Modify rpmsg-core to enable prefix-based matching of RPMSG device IDs.
>
> 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 (5):
>   docs: driver-api: gpio: rpmsg gpio driver over rpmsg bus
>   dt-bindings: remoteproc: imx_rproc: Add "rpmsg" subnode support
>   rpmsg: core: match rpmsg device IDs by prefix
>   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  | 242 ++++++++
>  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                     | 587 ++++++++++++++++++
>  drivers/rpmsg/rpmsg_core.c                    |   4 +-
>  9 files changed, 984 insertions(+), 1 deletion(-)
>  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
>