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Wed, 23 Sep 2026 18:43:12 +0000 From: Shenwei Wang To: Linus Walleij , Bartosz Golaszewski , Jonathan Corbet , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Mathieu Poirier , Frank Li , Sascha Hauer Cc: Shuah Khan , linux-gpio@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Pengutronix Kernel Team , Fabio Estevam , Shenwei Wang , Peng Fan , devicetree@vger.kernel.org, linux-remoteproc@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com, Arnaud POULIQUEN , b-padhi@ti.com, Andrew Lunn , Shenwei Wang Subject: [PATCH v16 0/5] Enable Remote GPIO over RPMSG on i.MX Platform Date: Wed, 23 Sep 2026 13:42:27 -0500 Message-ID: <20260923184255.299034-1-shenwei.wang@oss.nxp.com> X-Mailer: git-send-email 2.43.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: PH7P223CA0005.NAMP223.PROD.OUTLOOK.COM (2603:10b6:510:338::7) To VI1PR04MB7135.eurprd04.prod.outlook.com (2603:10a6:800:12c::22) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VI1PR04MB7135:EE_|AM8PR04MB7298:EE_ X-MS-Office365-Filtering-Correlation-Id: 1c26f30f-6b72-43bf-ae5b-08df19a28510 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|23010399003|19092799006|7416014|376014|1800799024|921020|3023799007|10067099003|56012099006|11063799006|18002099003; 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Changes in v16: - Removed linux/mod_devicetable.h and an extra comma per Uwe's feedback. - Added the "packed" attribute to struct rpmsg_gpio_response and set "can_sleep = true", per Sashiko's review comments. - Removed the channel node from the rpmsg node in dts layout. 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 | 46 ++ Documentation/driver-api/gpio/gpio-rpmsg.rst | 242 ++++++++ Documentation/driver-api/gpio/index.rst | 1 + arch/arm64/boot/dts/freescale/imx8ulp.dtsi | 23 + drivers/gpio/Kconfig | 17 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-rpmsg.c | 585 ++++++++++++++++++ drivers/rpmsg/rpmsg_core.c | 4 +- 9 files changed, 973 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