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Tue, 14 Jul 2026 03:09:47 -0700 From: Vishwaroop A To: CC: , , , , , Vishwaroop A Subject: [PATCH v6 0/2] spi: add new_device/delete_device sysfs interface Date: Tue, 14 Jul 2026 10:09:42 +0000 Message-ID: X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260517201602.498135-1-va@nvidia.com> References: <20260517201602.498135-1-va@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@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: BN2PEPF000044A8:EE_|BL1PR12MB5971:EE_ X-MS-Office365-Filtering-Correlation-Id: 244f4234-1076-4c5f-8f0d-08dee19027cc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|1800799024|376014|30052699003|82310400026|22082099003|56012099006|11063799006|18002099003|13003099007; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(36860700016)(23010399003)(1800799024)(376014)(30052699003)(82310400026)(22082099003)(56012099006)(11063799006)(18002099003)(13003099007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: T4XgH3YdZYwbyTxqDdzhUvFxqmBvFzsNwAvVOoDCEzN1NLwQ7lumR5F0zVnV9csXPv8YoEbO3yZEzY+tQlIUL66iKlJlYscNuVLzKP06Ghgee9I46g9cosQ8k0px9ITWbv+MD+HFiddUip5jz9u70XYEATBQx422aP5KcccujxHduUtm4p0Qrg8JH2uaxIMxP68SiZUUmGtRl17zkKNXKFcikTW3PN9tptrwBUQZmCaeFkeXbj4t3Z8abVEIaIUZJbRq+V1wg52gi02llE78+g2/ZZcQJf+BGARWD3aohO0EA/ZTE93vkAvyS3QisDNQrF3YlfoFxtrDBOlkAF93FmiRLgVhN6V38DdGistxpeirLQmd/2q9YmZx26dXfqWUsXjKm2PpmfzyAeGSHM3FtybFnevgMufZuAYzuRT7IztQLTxlUb1nnuVd88i8212k X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2026 10:10:39.0552 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 244f4234-1076-4c5f-8f0d-08dee19027cc X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000044A8.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5971 Add I2C-style new_device/delete_device sysfs attributes to SPI host controllers, allowing userspace to instantiate and remove SPI devices at runtime without device-tree changes. Patch 1 adds the new_device/delete_device attributes and the supporting infrastructure (userspace_clients list, locking, dead flag). Patch 2 adds the ABI and user-facing documentation. Changes since v5: - Rebased on next-20260707 (v7.2-rc2); applies cleanly. - Added missing kernel-doc entries for the new struct fields (@userspace_node, @userspace_clients, @userspace_clients_lock, @dead). - new_device_store(): reject chip_select > U8_MAX to avoid silent truncation in spi_set_chipselect(); parse with %u instead of %hu. - new_device_store(): reject mode bits outside SPI_MODE_USER_MASK (mirrors spidev's SPI_IOC_WR_MODE32 filter). - new_device_store(): drop the unused 'n' / '%n' from sscanf(). - Minor comment cleanup. Changes since v4: - Removed spi_unregister_device() call from new_device_store()'s ctlr->dead teardown path; it raced with device_for_each_child(__unregister) in spi_unregister_controller(). Changes since v3: - Replaced holding add_lock across __spi_add_device() + list insertion (which caused an ABBA deadlock with kernfs) by a ctlr->dead flag checked under add_lock / userspace_clients_lock. - Used a compile-time #if IS_ENABLED() guard for the ctlr->dead check in __spi_add_device(), since the dead field is conditional. Changes since v2: - Gated sysfs attributes and locking on CONFIG_SPI_DYNAMIC. Changes since v1: - Added locking to prevent races between new_device_store() and concurrent spi_unregister_controller(). Link: https://lore.kernel.org/linux-spi/20260517201602.498135-1-va@nvidia.com/ # v5 Link: https://lore.kernel.org/linux-tegra/909f0c92-d110-4253-903e-5c81e21e12c9@nvidia.com/ 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 | 238 +++++++++++++++++- include/linux/spi/spi.h | 21 ++ 5 files changed, 376 insertions(+), 6 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-class-spi-master create mode 100644 Documentation/spi/instantiating-devices.rst base-commit: be5c93fa674f0fc3c8f359c2143abce6bbb422e6 -- 2.17.1