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GET /api/patches/2195285/?format=api
{ "id": 2195285, "url": "http://patchwork.ozlabs.org/api/patches/2195285/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260210170439.406513-3-shenwei.wang@nxp.com/", "project": { "id": 42, "url": "http://patchwork.ozlabs.org/api/projects/42/?format=api", "name": "Linux GPIO development", "link_name": "linux-gpio", "list_id": "linux-gpio.vger.kernel.org", "list_email": "linux-gpio@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260210170439.406513-3-shenwei.wang@nxp.com>", "list_archive_url": null, "date": "2026-02-10T17:04:36", "name": "[v7,2/4] docs: driver-api: gpio: generic gpio driver over rpmsg bus", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4f189043bdafe0969e7ead0cf39c7459d79a6da7", "submitter": { "id": 74153, "url": "http://patchwork.ozlabs.org/api/people/74153/?format=api", "name": "Shenwei Wang", "email": "shenwei.wang@nxp.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260210170439.406513-3-shenwei.wang@nxp.com/mbox/", "series": [ { "id": 491711, "url": "http://patchwork.ozlabs.org/api/series/491711/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/list/?series=491711", "date": "2026-02-10T17:04:34", "name": "Enable Remote GPIO over RPMSG on i.MX Platform", "version": 7, "mbox": "http://patchwork.ozlabs.org/series/491711/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2195285/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2195285/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-gpio+bounces-31560-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-gpio@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ 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"DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=yVqckOBNIY3LbX1I/NiivWSMqnKn59+hQw/6glWHZZA=;\n b=jsOz/23x25jbb4w5s0IqazgYZtiIRyN9OsKGWL4txD12zxni4kLq/U91ict5VYT9s7B9ZBOVe5H22BfYF1D0gTPFCbPj7ZPvzBZyKf+BeXgJgP+y88AV/GDvPp9zpPQ4ZaAagTiLSVRzxRuFM6RpBuwO44gBYwuYR2lmA2unbgKcH6u+rcg0C8mKt4HFkhRqtX9D59jXDDLKMXAEP7HGSx+39ynetDFSus1o0cVSZFFKNgvV9wHI3uobE6QykfkweIX9EsuWnwf2Ax88Hh86GVtXXtPceHmEEKCID9Psa4WIT42VJLJF0ARKV+cHUPKalUF1mgJ1CojtYyvkI1fLUg==", "From": "Shenwei Wang <shenwei.wang@nxp.com>", "To": "Linus Walleij <linusw@kernel.org>,\n\tBartosz Golaszewski <brgl@kernel.org>,\n\tRob Herring <robh@kernel.org>,\n\tKrzysztof Kozlowski <krzk+dt@kernel.org>,\n\tConor Dooley <conor+dt@kernel.org>,\n\tBjorn Andersson <andersson@kernel.org>,\n\tMathieu Poirier <mathieu.poirier@linaro.org>,\n\tShawn Guo <shawnguo@kernel.org>,\n\tSascha Hauer <s.hauer@pengutronix.de>,\n\tJonathan Corbet <corbet@lwn.net>", "Cc": "Pengutronix Kernel Team <kernel@pengutronix.de>,\n\tFabio Estevam <festevam@gmail.com>,\n\tShenwei Wang <shenwei.wang@nxp.com>,\n\tPeng Fan <peng.fan@nxp.com>,\n\tlinux-gpio@vger.kernel.org,\n\tdevicetree@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-remoteproc@vger.kernel.org,\n\timx@lists.linux.dev,\n\tlinux-arm-kernel@lists.infradead.org,\n\tlinux-doc@vger.kernel.org,\n\tlinux-imx@nxp.com,\n\tarnaud.pouliquen@foss.st.com", "Subject": "[PATCH v7 2/4] docs: driver-api: gpio: generic gpio driver over rpmsg\n bus", "Date": "Tue, 10 Feb 2026 11:04:36 -0600", "Message-ID": "<20260210170439.406513-3-shenwei.wang@nxp.com>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260210170439.406513-1-shenwei.wang@nxp.com>", "References": "<20260210170439.406513-1-shenwei.wang@nxp.com>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": 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"X-OriginatorOrg": "nxp.com", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 9459d578-fb7d-4b89-ff8a-08de68c6a135", "X-MS-Exchange-CrossTenant-AuthSource": "PAXPR04MB9185.eurprd04.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "10 Feb 2026 17:05:45.2207\n (UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "686ea1d3-bc2b-4c6f-a92c-d99c5c301635", "X-MS-Exchange-CrossTenant-MailboxType": "HOSTED", "X-MS-Exchange-CrossTenant-UserPrincipalName": "\n XvanMmhftIm73jQCxiDZmLejny09JKcXWQnsC78P+VixRJlg1R8MRS+2LLSk9sQtxfAoLjtzdWIeBbVHoO0/jA==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "DB9PR04MB8362" }, "content": "Describes the gpio rpmsg transport protocol over the rpmsg bus between\nthe cores.\n\nSigned-off-by: Shenwei Wang <shenwei.wang@nxp.com>\n---\n Documentation/driver-api/gpio/gpio-rpmsg.rst | 236 +++++++++++++++++++\n Documentation/driver-api/gpio/index.rst | 1 +\n 2 files changed, 237 insertions(+)\n create mode 100644 Documentation/driver-api/gpio/gpio-rpmsg.rst", "diff": "diff --git a/Documentation/driver-api/gpio/gpio-rpmsg.rst b/Documentation/driver-api/gpio/gpio-rpmsg.rst\nnew file mode 100644\nindex 000000000000..6964de309471\n--- /dev/null\n+++ b/Documentation/driver-api/gpio/gpio-rpmsg.rst\n@@ -0,0 +1,236 @@\n+.. SPDX-License-Identifier: GPL-2.0-or-later\n+\n+GPIO RPMSG Protocol\n+===================\n+\n+The GPIO RPMSG transport protocol is used for communication and interaction\n+with GPIO controllers located on remote cores on the RPMSG bus.\n+\n+Message Format\n+--------------\n+\n+The RPMSG message consists of a 14-byte packet with the following layout:\n+\n+.. code-block:: none\n+\n+ +-----+-------+--------+-----+-----+------------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | ID |vendor |version |type |cmd |reserved[5] |line |port | data |\n+ +-----+-------+--------+-----+-----+------------+-----+-----+-----+----+\n+\n+- **ID (Message Identification Code)**: Must be 0x5. Indicates the GPIO message.\n+\n+- **Vendor**: Vendor ID number.\n+ - 0: Reserved\n+ - 1: NXP\n+\n+- **Version**: Vendor-specific version number (such as software release).\n+\n+- **Type (Message Type)**: The message type can be one of:\n+\n+ - 0: GPIO_RPMSG_SETUP\n+ - 1: GPIO_RPMSG_REPLY\n+ - 2: GPIO_RPMSG_NOTIFY\n+\n+- **Cmd**: Command code, used for GPIO_RPMSG_SETUP messages.\n+\n+- **reserved[5]**: Reserved bytes. Should always be 0.\n+\n+- **line**: The GPIO line(pin) index of the port.\n+\n+- **port**: The GPIO port(bank) index.\n+\n+- **data**: See details in the command description below.\n+\n+GPIO Commands\n+-------------\n+\n+Commands are specified in the **Cmd** field for **GPIO_RPMSG_SETUP** (Type=0) messages.\n+\n+The SETUP message is always sent from Linux to the remote firmware. Each\n+SETUP corresponds to a single REPLY message. The GPIO driver should\n+serialize messages and determine whether a REPLY message is required. If a\n+REPLY message is expected but not received within the specified timeout\n+period (currently 1 second in the Linux driver), the driver should return\n+-ETIMEOUT.\n+\n+GPIO_RPMSG_INPUT_INIT (Cmd=0)\n+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | 5 | 1 | 0 | 0 | 0 | 0 |line |port | val | wk |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+\n+- **val**: Interrupt trigger type.\n+\n+ - 0: Interrupt disabled\n+ - 1: Rising edge trigger\n+ - 2: Falling edge trigger\n+ - 3: Both edge trigger\n+ - 4: Low level trigger\n+ - 5: High level trigger\n+\n+- **wk**: Wakeup enable.\n+\n+ The remote system should always aim to stay in a power-efficient state by\n+ shutting down or clock-gating the GPIO blocks that aren't in use. Since\n+ the remoteproc driver is responsible for managing the power states of the\n+ remote firmware, the GPIO driver does not require to know the firmware's\n+ running states.\n+\n+ When the wakeup bit is set, the remote firmware should configure the line\n+ as a wakeup source. The firmware should send the notification message to\n+ Linux after it is woken from the GPIO line.\n+\n+ - 0: Disable wakeup from GPIO\n+ - 1: Enable wakeup from GPIO\n+\n+**Reply:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | 5 | 1 | 0 | 1 | 1 | 0 |line |port | err | 0 |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+\n+- **err**: Error code from the remote core.\n+\n+ - 0: Success\n+ - 1: General error (Early remote software only returns this unclassified error)\n+ - 2: Not supported (A command is not supported by the remote firmware)\n+ - 3: Resource not available (The resource is not allocated to Linux)\n+ - 4: Resource busy (The resource is already in use)\n+ - 5: Parameter error\n+\n+GPIO_RPMSG_OUTPUT_INIT (Cmd=1)\n+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | 5 | 1 | 0 | 0 | 1 | 0 |line |port | val | 0 |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+\n+- **val**: Output level.\n+\n+ - 0: Low\n+ - 1: High\n+\n+**Reply:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | 5 | 1 | 0 | 1 | 1 | 0 |line |port | err | 0 |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+\n+- **err**: See above for definitions.\n+\n+GPIO_RPMSG_INPUT_GET (Cmd=2)\n+~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | 5 | 1 | 0 | 0 | 2 | 0 |line |port | 0 | 0 |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+\n+**Reply:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+-----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D |\n+ | 5 | 1 | 0 | 1 | 2 | 0 |line |port | err |level|\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+-----+\n+\n+- **err**: See above for definitions.\n+\n+- **level**: Input level.\n+\n+ - 0: Low\n+ - 1: High\n+\n+GPIO_RPMSG_GET_DIRECTION (Cmd=3)\n+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | 5 | 1 | 0 | 0 | 3 | 0 |line |port | 0 | 0 |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+\n+**Reply:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+-----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D |\n+ | 5 | 1 | 0 | 1 | 3 | 0 |line |port | err | dir |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+-----+\n+\n+- **err**: See above for definitions.\n+\n+- **dir**: Direction.\n+\n+ - 0: Output\n+ - 1: Input\n+\n+GPIO_RPMSG_NOTIFY_REPLY (Cmd=4)\n+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n+The reply message for the notification is optional. The remote firmware can\n+implement it to simulate the interrupt acknowledgment behavior.\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | 5 | 1 | 0 | 0 | 4 | 0 |line |port |level| 0 |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+\n+- **line**: The GPIO line(pin) index of the port.\n+- **port**: The GPIO port(bank) index.\n+\n+Notification Message\n+--------------------\n+\n+Notifications are sent with **Type=2 (GPIO_RPMSG_NOTIFY)**:\n+\n+When a GPIO line asserts an interrupt on the remote processor, the firmware\n+should immediately mask the corresponding interrupt source and send a\n+notification message to the Linux. Upon completion of the interrupt\n+handling on the Linux side, the driver should issue a\n+**GPIO_RPMSG_INPUT_INIT** command to the firmware to unmask the interrupt.\n+\n+A Notification message can arrive between a SETUP and its REPLY message,\n+and the driver is expected to handle this scenario.\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05..0x09 |0x0A |0x0B |0x0C |0x0D|\n+ | 5 | 1 | 0 | 2 | 0 | 0 |line |port |type | 0 |\n+ +-----+-----+-----+-----+-----+-----------+-----+-----+-----+----+\n+\n+- **line**: The GPIO line(pin) index of the port.\n+- **port**: The GPIO port(bank) index.\n+- **type**: Optional pamameter to indicate the trigger event type.\n+\ndiff --git a/Documentation/driver-api/gpio/index.rst b/Documentation/driver-api/gpio/index.rst\nindex bee58f709b9a..e5eb1f82f01f 100644\n--- a/Documentation/driver-api/gpio/index.rst\n+++ b/Documentation/driver-api/gpio/index.rst\n@@ -16,6 +16,7 @@ Contents:\n drivers-on-gpio\n bt8xxgpio\n pca953x\n+ gpio-rpmsg\n \n Core\n ====\n", "prefixes": [ "v7", "2/4" ] }