linux-kernel - [PATCH v5 0/5] Enable Remote GPIO over RPMSG on i.MX Platform

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Message-ID: <20251104203315.85706-1-shenwei.wang@nxp.com>
Date: Tue,  4 Nov 2025 14:33:10 -0600
From: Shenwei Wang <shenwei.wang@....com>
To: Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Shenwei Wang <shenwei.wang@....com>,
	Peng Fan <peng.fan@....com>,
	linux-remoteproc@...r.kernel.org,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-imx@....com,
	Randy Dunlap <rdunlap@...radead.org>,
	Andrew Lunn <andrew@...n.ch>,
	Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>,
	linux-gpio@...r.kernel.org
Subject: [PATCH v5 0/5] Enable Remote GPIO over RPMSG on i.MX Platform

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

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

Cc: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: linux-gpio@...r.kernel.org

Shenwei Wang (5):
  dt-bindings: remoteproc: imx_rproc: Add "rpmsg" subnode support
  remoteproc: imx_rproc: Populate devices under "rpmsg" subnode
  docs: staging: gpio-rpmsg: gpio over rpmsg bus
  gpio: imx-rpmsg: add imx-rpmsg GPIO driver
  arm64: dts: imx8ulp: Add rpmsg node under imx_rproc

 .../bindings/remoteproc/fsl,imx-rproc.yaml    | 123 +++++
 Documentation/staging/gpio-rpmsg.rst          | 202 ++++++++
 Documentation/staging/index.rst               |   1 +
 arch/arm64/boot/dts/freescale/imx8ulp.dtsi    |  27 +
 drivers/gpio/Kconfig                          |  17 +
 drivers/gpio/Makefile                         |   1 +
 drivers/gpio/gpio-imx-rpmsg.c                 | 475 ++++++++++++++++++
 drivers/remoteproc/imx_rproc.c                | 146 ++++++
 include/linux/rpmsg/imx_rpmsg.h               |  48 ++
 9 files changed, 1040 insertions(+)
 create mode 100644 Documentation/staging/gpio-rpmsg.rst
 create mode 100644 drivers/gpio/gpio-imx-rpmsg.c
 create mode 100644 include/linux/rpmsg/imx_rpmsg.h

--
2.43.0