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spi: add new_device/delete_device sysfs interface

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Vishwaroop A <va@nvidia.com> says:

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, manual sysfs group registration).
Patch 2 adds the ABI and user-facing documentation.

Link: https://lore.kernel.org/linux-spi/20260728191056.2337791-1-va@nvidia.com/  # v8
Link: https://lore.kernel.org/linux-spi/20260728030541.2279518-1-va@nvidia.com/  # v7
Link: https://lore.kernel.org/linux-spi/cover.1784000000.git.va@nvidia.com/  # v6
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/
Link: https://patch.msgid.link/20260803104614.2548375-1-va@nvidia.com
This commit is contained in:
Mark Brown 2026-08-06 19:13:17 +01:00
commit a2d6aa3b84
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