linux-kernel - [PATCH v2 0/4] Enable Remote GPIO over RPMSG on i.MX Platform

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Message-ID: <20250922200413.309707-1-shenwei.wang@nxp.com>
Date: Mon, 22 Sep 2025 15:04:09 -0500
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>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.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-imx@....com,
	Shenwei Wang <shenwei.wang@....com>,
	Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
Subject: [PATCH v2 0/4] 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.

The expected DTS layout structure is following:

    cm33: remoteproc-cm33 {
             compatible = "fsl,imx8ulp-cm33";

             rpmsg {
                     rpmsg-io-channel {
                             gpio@0 {
                                     compatible = "fsl,imx-rpmsg-gpio";
                                     reg = <0>;
                             };

                             gpio@1 {
                                     compatible = "fsl,imx-rpmsg-gpio";
                                     reg = <1>;
                             };

                             ...
                     };

                     rpmsg-i2c-channel {
                             i2c@0 {
                                     compatible = "fsl,imx-rpmsg-i2c";
                                     reg = <0>;
                             };
                     };

                     ...
             };
     };

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: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
Cc: Linus Walleij <linus.walleij@...aro.org>

Shenwei Wang (4):
  dt-bindings: remoteproc: imx_rproc: Add "rpmsg" subnode support
  remoteproc: imx_rproc: Populate devices under "rpmsg" subnode
  gpio: imx-rpmsg: add imx-rpmsg GPIO driver
  arm64: dts: imx8ulp: Add rpmsg node under imx_rproc

 .../bindings/remoteproc/fsl,imx-rproc.yaml    | 129 +++++
 arch/arm64/boot/dts/freescale/imx8ulp.dtsi    |  27 +
 drivers/gpio/Kconfig                          |  17 +
 drivers/gpio/Makefile                         |   1 +
 drivers/gpio/gpio-imx-rpmsg.c                 | 488 ++++++++++++++++++
 drivers/remoteproc/imx_rproc.c                | 126 +++++
 include/linux/rpmsg/imx_rpmsg.h               |  48 ++
 7 files changed, 836 insertions(+)
 create mode 100644 drivers/gpio/gpio-imx-rpmsg.c
 create mode 100644 include/linux/rpmsg/imx_rpmsg.h

--
2.43.0