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Mon, 4 May 2026 00:40:37 -0700 From: Vishwaroop A To: , CC: , , , , , Subject: [PATCH v3 0/2] spi: add sysfs interface for userspace device instantiation Date: Mon, 4 May 2026 07:40:35 +0000 Message-ID: <20260504074037.704833-1-va@nvidia.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB75:EE_|SA1PR12MB7040:EE_ X-MS-Office365-Filtering-Correlation-Id: 6def6c58-1ada-4d65-e764-08dea9b07700 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700016|376014|30052699003|56012099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(36860700016)(376014)(30052699003)(56012099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: xb2hxlL35FRkYvExubHjBFSpPHVffmLMS58bSHLRBlNE7W2vWNh+2wSY6VyIIgj5Fcvp9TR7PSp87cyMZE5/R8iKE6CVTClxwC1blFyjOZQVtvcO6/WsemBO4R3ti6ITw5AZNC1zLlPIUqpS/jhQNll5aAVN4UMUGf40njVtJygTWnpPWzsMc/Q6iZo5Oxk4JbntXD4THW1DJ+tL3sopC1G+0CaTGN3lOw3RqpzMkY4TSSNTLU756+c1t4suvDoZdYfmUzshygzCAIQFSmN2rq65PLaejyarizOIAcezC30NFcUQqIL8nODxwvy0lot2nAbcR8eM+fySG6McLa+5OO3lTaqAKB6eUNyKxEK5dEmyx+1Fuc07/qTe1znwkSI2jkTU4yfxgyuY4ut6OvANyVZ6ut0jb3xGbTL3HZDYlQg7oobaskmkV2K+rRAhZKMs X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 May 2026 07:40:50.7110 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6def6c58-1ada-4d65-e764-08dea9b07700 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB75.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB7040 Development boards such as the Jetson AGX Orin expose SPI buses on expansion headers so that users can connect and interact with SPI peripherals from userspace via /dev/spidevB.C character devices. Today, instantiating spidev devices on upstream kernels is impractical: the spidev driver rejects bare "spidev" compatible strings in DT, and vendor-specific strings have been rejected by DT maintainers. This series adds an I2C-style new_device/delete_device sysfs interface to SPI host controllers, enabling runtime device instantiation from userspace without any device-tree changes. Patch 1 adds the core sysfs interface (new_device/delete_device). Patch 2 adds user-facing documentation and ABI entries. Changes in v3: - Made the entire feature conditional on CONFIG_SPI_DYNAMIC using #if IS_ENABLED(CONFIG_SPI_DYNAMIC) preprocessor guards, since this adds a new way of dynamically instantiating and removing SPI devices and the add_lock locking in spi_unregister_controller() is already conditional on CONFIG_SPI_DYNAMIC (Mark Brown) - Wrapped userspace_clients list, lock, and userspace_node struct members in #if IS_ENABLED(CONFIG_SPI_DYNAMIC) in spi.h - Started a new thread instead of replying to v2 (Mark Brown) Changes in v2: - Fixed a race between new_device_store() and spi_unregister_controller(): hold ctlr->add_lock across both __spi_add_device() and the list insertion so the two operations are atomic with respect to controller teardown (Mark Brown) Vishwaroop A (2): spi: add new_device/delete_device sysfs interface docs: spi: add documentation for userspace device instantiation .../ABI/testing/sysfs-class-spi-master | 34 +++ Documentation/spi/index.rst | 1 + Documentation/spi/instantiating-devices.rst | 88 ++++++++ drivers/spi/spi.c | 206 ++++++++++++++++++ include/linux/spi/spi.h | 12 + 5 files changed, 341 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-spi-master create mode 100644 Documentation/spi/instantiating-devices.rst -- 2.17.1