unflatten_dt_nodes(9)

🌸 unflatten_dt_nodes(9) 🌸

okay so bestie, welcome to the Kernel API Manual ✨ this one is unflatten_dt_nodes(9) and it's literally the glow-up artist for device trees — it takes the flat blob and makes it structured. we love a makeover moment 💅

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✨ NAME ✨

unflatten_dt_nodes — Alloc and populate a device_node from the flat tree 🦋

like, it allocates stuff and populates a device_node, using the flat tree as the inspo. no cap.

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🎀 SYNOPSIS 🎀

int unflatten_dt_nodes (const void *blob , void *mem , struct
      device_node *dad , struct device_node **nodepp );

here's the whole vibe, signature and all 👑

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💖 ARGUMENTS 💖

• blob — The parent device tree blob 🌳 the original flat-tree situation, the raw material, the before-photo
• mem — Memory chunk to use for allocating device nodes and properties 🎀 this is the budget, bestie — all the device_nodes and properties get allocated out of this chunk
• dad — Parent struct device_node 👑 the parent node, the main character these new nodes get attached under
• nodepp — The device_node tree created by the call ✨ the output — the whole tree this call builds, handed back to you through this pointer

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🔥 RETURN 🔥

The size of unflattened device tree or error code — so on a slay day you get the size of the unflattened device tree, and on a flop day you get an error code 😭 check it, fr fr.

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🌈 SEE ALSO 🌈

Kernel file ./drivers/of/fdt.c — and the whole friend group 🫶:

• __unflatten_device_tree(9)
• of_fdt_unflatten_tree(9)
• early_init_fdt_scan_reserved_mem(9)
• early_init_fdt_reserve_self(9)
• of_scan_flat_dt(9)
• of_scan_flat_dt_subnodes(9)
• of_get_flat_dt_subnode_by_name(9)
• of_fdt_is_compatible(9)
• of_flat_dt_is_compatible(9)
• of_flat_dt_match_machine(9)
• early_init_dt_check_for_initrd(9)
• early_init_dt_check_for_elfcorehdr(9)
• early_init_dt_check_for_usable_mem_range(9)
• early_init_dt_check_kho(9)
• unflatten_device_tree(9)
• unflatten_and_copy_device_tree(9)

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and that's the whole page, bestie — go unflatten some nodes and live your truth 🧚💜

this lil masterpiece lives in ./drivers/of, dated October 2026, and yes the page is also called unflatten_dt_nodes(9) because consistency is iconic 💅 periodt.