of_reserved_..._to_resource(9)

👑 of_reserved_..._to_resource(9) — the Kernel API Manual, bestie edition 💅

okay so this is a page from the Kernel API Manual, and it's literally about of_reserved_mem_region_to_resource — yes the name is a whole mouthful, we're surviving tho 🫶

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✨ NAME ✨

of_reserved_mem_region_to_resource — get a reserved memory region as a resource, periodt 💖

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🌸 SYNOPSIS 🌸

int of_reserved_mem_region_to_resource (const struct device_node *np ,
       unsigned int idx , struct resource *res );

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🎀 ARGUMENTS 🎀

• np — the node that's holding the 'memory-region' property, like it's carrying the whole vibe 🦋
• idx — which 'memory-region' property entry you wanna look up, by index, iykyk 🔥
• res — pointer to a struct resource that gets filled in with the reserved region 💜

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⭐ DESCRIPTION ⭐

so this function lets drivers look up a node's 'memory-region' property entries by index and hand back a struct resource for that entry. iconic behavior honestly 👑

it returns 0 on success, with res filled in — slay 🌈

it returns -ENODEV if 'memory-region' is missing or unavailable, and -EINVAL for any other error. no cap, those are the only two error flavors 💀

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🦋 SEE ALSO 🦋

kernel file ./drivers/of/of_reserved_mem.c — go read it, it's giving main character energy 📖✨

and the whole friend group:

• fdt_scan_reserved_mem_late(9)
• fdt_fixup_reserved_mem_node(9)
• fdt_validate_reserved_mem_node(9)
• __reserved_mem_init_node(9)
• fdt_init_reserved_mem_node(9)
• of_reserved_mem_device_init_by_idx(9)
• of_reserved_mem_device_init_by_name(9)
• of_reserved_mem_device_release(9)
• devm_of_reserved_mem_device_init(9)
• of_reserved_mem_lookup(9)
• of_reserved_mem_region_to_resource_byname(9)
• of_reserved_mem_region_count(9)

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and that's the page, bestie 🍓 it lives in ./drivers/of, it's dated October 2026, and it's filed under of_reserved_..._to_resource(9) — mwah, go touch some reserved memory 💋🧚