{"id":2226904,"url":"http://patchwork.ozlabs.org/api/patches/2226904/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-gpio/patch/20260422212849.1240591-2-shenwei.wang@nxp.com/","project":{"id":42,"url":"http://patchwork.ozlabs.org/api/projects/42/?format=json","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":"<20260422212849.1240591-2-shenwei.wang@nxp.com>","list_archive_url":null,"date":"2026-04-22T21:28:46","name":"[v13,1/4] docs: driver-api: gpio: rpmsg gpio driver over rpmsg bus","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"5c987b32cb8a9319b12dfc22669077db7809e8f4","submitter":{"id":74153,"url":"http://patchwork.ozlabs.org/api/people/74153/?format=json","name":"Shenwei Wang","email":"shenwei.wang@nxp.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-gpio/patch/20260422212849.1240591-2-shenwei.wang@nxp.com/mbox/","series":[{"id":501113,"url":"http://patchwork.ozlabs.org/api/series/501113/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-gpio/list/?series=501113","date":"2026-04-22T21:28:45","name":"Enable Remote GPIO over RPMSG on i.MX Platform","version":13,"mbox":"http://patchwork.ozlabs.org/series/501113/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226904/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226904/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256\n 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,\n\tdevicetree@vger.kernel.org,\n\tlinux-remoteproc@vger.kernel.org,\n\timx@lists.linux.dev,\n\tlinux-arm-kernel@lists.infradead.org,\n\tlinux-imx@nxp.com","Subject":"[PATCH v13 1/4] docs: driver-api: gpio: rpmsg gpio driver over rpmsg\n bus","Date":"Wed, 22 Apr 2026 16:28:46 -0500","Message-ID":"<20260422212849.1240591-2-shenwei.wang@nxp.com>","X-Mailer":"git-send-email 2.43.0","In-Reply-To":"<20260422212849.1240591-1-shenwei.wang@nxp.com>","References":"<20260422212849.1240591-1-shenwei.wang@nxp.com>","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-ClientProxiedBy":"BYAPR06CA0058.namprd06.prod.outlook.com\n (2603:10b6:a03:14b::35) To PAXPR04MB9185.eurprd04.prod.outlook.com\n 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3196bfa6-688d-4d32-7d4a-08dea0b65145","X-MS-Exchange-CrossTenant-AuthSource":"PAXPR04MB9185.eurprd04.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"22 Apr 2026 21:30:16.4340\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 h/CZQ2fbSP09/YV2BjA3OZG9plD7gSJ+fMFnuvGkxiGGz4GijpXboTSmXQLyqHw3jhrbJktDSpqPfLT4yzvgrA==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"PR3PR04MB7449"},"content":"Describes the gpio rpmsg transport protocol over the rpmsg bus between\nthe remote system and Linux.\n\nSigned-off-by: Shenwei Wang \n---\n Documentation/driver-api/gpio/gpio-rpmsg.rst | 266 +++++++++++++++++++\n Documentation/driver-api/gpio/index.rst | 1 +\n 2 files changed, 267 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..abfde68c9b0a\n--- /dev/null\n+++ b/Documentation/driver-api/gpio/gpio-rpmsg.rst\n@@ -0,0 +1,266 @@\n+.. SPDX-License-Identifier: GPL-2.0-or-later\n+\n+GPIO RPMSG (Remote Processor Messaging) Protocol\n+================================================\n+\n+The GPIO RPMSG transport protocol is used for communication and interaction\n+with GPIO controllers on remote processors via the RPMSG bus.\n+\n+Message Format\n+--------------\n+\n+The RPMSG message consists of a 6-byte packet with the following layout:\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ |type |cmd |port |line | data |\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **type (Message Type)**: The message type can be one of:\n+\n+ - 0: GPIO_RPMSG_SEND\n+ - 1: GPIO_RPMSG_REPLY\n+ - 2: GPIO_RPMSG_NOTIFY\n+\n+- **cmd**: Command code, used for GPIO_RPMSG_SEND messages.\n+\n+- **port**: The GPIO port (bank) index.\n+\n+- **line**: The GPIO line (pin) index of the port.\n+\n+- **data**: See details in the command description below.\n+\n+- **reply 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+\n+GPIO Commands\n+-------------\n+\n+Commands are specified in the **Cmd** field for **GPIO_RPMSG_SEND** (Type=0) messages.\n+\n+The SEND message is always sent from Linux to the remote firmware. Each\n+SEND 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+GET_DIRECTION (Cmd=2)\n+~~~~~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ | 0 | 2 |port |line | 0 | 0 |\n+ +-----+-----+-----+-----+-----+----+\n+\n+**Reply:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ | 1 | 2 |port |line | err | dir|\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **err**: See above for definitions.\n+\n+- **dir**: Direction.\n+\n+ - 0: None\n+ - 1: Output\n+ - 2: Input\n+\n+SET_DIRECTION (Cmd=3)\n+~~~~~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ | 0 | 3 |port |line | dir | 0 |\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **dir**: Direction.\n+\n+ - 0: None\n+ - 1: Output\n+ - 2: Input\n+\n+**Reply:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ | 1 | 3 |port |line | err | 0 |\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **err**: See above for definitions.\n+\n+\n+GET_VALUE (Cmd=4)\n+~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ | 0 | 4 |port |line | 0 | 0 |\n+ +-----+-----+-----+-----+-----+----+\n+\n+**Reply:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ | 1 | 4 |port |line | err | val|\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **err**: See above for definitions.\n+\n+- **val**: Line level.\n+\n+ - 0: Low\n+ - 1: High\n+\n+SET_VALUE (Cmd=5)\n+~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ | 0 | 5 |port |line | 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|\n+ | 1 | 5 |port |line | err | 0 |\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **err**: See above for definitions.\n+\n+SET_IRQ_TYPE (Cmd=6)\n+~~~~~~~~~~~~~~~~~~~~\n+\n+**Request:**\n+\n+.. code-block:: none\n+\n+ +-----+-----+-----+-----+-----+----+\n+ |0x00 |0x01 |0x02 |0x03 |0x04 |0x05|\n+ | 0 | 6 |port |line | val | wk |\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **val**: IRQ types.\n+\n+ - 0: Interrupt disabled\n+ - 1: Rising edge trigger\n+ - 2: Falling edge trigger\n+ - 3: Both edge trigger\n+ - 4: High level trigger\n+ - 8: Low 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|\n+ | 1 | 6 |port |line | err | 0 |\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **err**: See above for definitions.\n+\n+NOTIFY_REPLY (Cmd=10)\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|\n+ | 0 | 10 |port |line |level| 0 |\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **port**: The GPIO port (bank) index.\n+\n+- **line**: The GPIO line (pin) index of the port.\n+\n+- **level**: GPIO line status.\n+\n+Notification Message\n+--------------------\n+\n+Notifications are sent by the remote core and they have\n+**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+command **SET_IRQ_TYPE** to the firmware to unmask the interrupt.\n+\n+A Notification message can arrive between a SEND 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|\n+ | 2 | 0 |port |line |type | 0 |\n+ +-----+-----+-----+-----+-----+----+\n+\n+- **port**: The GPIO port (bank) index.\n+\n+- **line**: The GPIO line (pin) index of the port.\n+\n+- **type**: Optional parameter 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":["v13","1/4"]}