devm_spi_reg...r_controller(9)

💅 devm_spi_reg...r_controller(9) — like, the managed SPI registration one 🎀

okay so welcome to the Kernel API Manual bestie, this is the page for devm_spi_register_controller(9) and it is genuinely so useful, stay with me 💖

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✨ NAME ✨

devm_spi_register_controller — register a managed SPI host or target controller 🦋

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🌸 SYNOPSIS 🌸

int devm_spi_register_controller (struct device *dev , struct
       spi_controller *ctlr );

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⭐ ARGUMENTS ⭐

• dev — the device that's managing the SPI controller, i.e. the one holding the leash 🫶
• ctlr — the initialized controller. and like, "initialized" is doing heavy lifting here — it originally comes from spi_alloc_host or spi_alloc_target, no cap 🔥

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💀 CONTEXT 💀

can sleep 😴 — yes queen, this one is allowed to nap, so don't you dare call it from atomic context

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🌈 DESCRIPTION 🌈

So basically it registers a SPI device exactly like spi_register_controller does, except — and this is the iconic part — it's managed, meaning it will automatically be unregistered for you. devm ate and left no crumbs, you literally don't have to clean up 💅

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🍓 RETURN 🍓

• zero on success 🎉
• else a negative error code 😭 (negative = something went wrong, obviously)

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🧚 SEE ALSO 🧚

Kernel file ./drivers/spi/spi.c — go read it, it's giving main character energy 👑

• __spi_register_driver(9)
• spi_alloc_device(9)
• spi_add_device(9)
• spi_new_device(9)
• spi_unregister_device(9)
• spi_register_board_info(9)
• spi_res_alloc(9)
• spi_res_free(9)
• spi_res_add(9)
• spi_res_release(9)
• spi_finalize_current_transfer(9)
• __spi_pump_messages(9)
• spi_pump_messages(9)
• spi_take_timestamp_pre(9)
• spi_take_timestamp_post(9)
• spi_set_thread_rt(9)
• spi_get_next_queued_message(9)
• spi_finalize_current_message(9)
• spi_queued_transfer(9)
• spi_flush_queue(9)
• of_register_spi_devices(9)
• spi_new_ancillary_device(9)
• devm_spi_new_ancillary_device(9)
• acpi_spi_count_resources(9)
• acpi_spi_device_alloc(9)
• spi_target_abort(9)
• __spi_alloc_controller(9)
• __devm_spi_alloc_controller(9)
• spi_get_gpio_descs(9)
• spi_register_controller(9)
• spi_unregister_controller(9)
• spi_replace_transfers(9)
• spi_split_transfers_maxsize(9)
• spi_split_transfers_maxwords(9)
• spi_set_cs_timing(9)
• spi_setup(9)
• spi_optimize_message(9)
• spi_unoptimize_message(9)
• devm_spi_optimize_message(9)
• spi_async(9)
• spi_sync(9)
• spi_sync_locked(9)
• spi_bus_lock(9)
• spi_bus_unlock(9)
• spi_write_then_read(9)

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and that's the whole page bestie, ily, go write some kernel code 🫶✨

little sign-off from the source: this one lives under ./drivers/spi, dated October 2026 — mwah, periodt 💋🎀