spi_split_tr...ers_maxwords(9)

🌸 NAME 🌸

okay so this is the spi_split_tr...ers_maxwords(9) page from the Kernel API Manual, and it's all about spi_split_transfers_maxwords — a function that splits SPI transfers into multiple transfers when an individual transfer exceeds a certain number of SPI words. it's giving “split the transfer, not the vibe” ✨💅

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🦋 SYNOPSIS 🦋

int spi_split_transfers_maxwords (struct spi_controller *ctlr , struct
spi_message *msg , size_t maxwords );

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🎀 ARGUMENTS 🎀

• ctlr — the spi_controller for this transfer 👑
• msg — the spi_message to transform 🫶
• maxwords — the number of words to limit each transfer to 🔢

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💖 DESCRIPTION 💖

okay bestie, here's the important part: this function allocates resources that are automatically freed during the spi message unoptimize phase. so this function should only be called from optimize_message callbacks. that's the whole rule, no cap 🚨

⚠️ real talk: because those resources get automatically freed during the spi message unoptimize phase, you should only call this from optimize_message callbacks. don't just call it wherever, bestie 😭

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⭐ RETURN ⭐

returns the status of transformation. that's it — the status. of the transformation. periodt 💅

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🌈 SEE ALSO 🌈

okay so this function has a whole friend group, and we are not skipping anybody. here's the full squad, bestie:

• Kernel file ./drivers/spi/spi.c — yes, the actual kernel file, iconic 💖
• __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)
• devm_spi_register_controller(9)
• spi_unregister_controller(9)
• spi_replace_transfers(9)
• spi_split_transfers_maxsize(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 page, bestie 🫶 this cutie came from ./drivers/spi, dated October 2026, and the manual page is spi_split_tr...ers_maxwords(9). mwah 💋🎀