of_address_to_resource(9)

okay so bestie, welcome to of_address_to_resource(9) from the Kernel API Manual — the function that translates a device tree address and returns it as a resource. literally iconic behavior. ✨🎀

🌸 NAME 🌸

of_address_to_resource — translate device tree address and return as resource. periodt. 💅

✨ SYNOPSIS ✨

int of_address_to_resource (struct device_node *dev , int index , struct
       resource *r );

🫶 ARGUMENTS 🫶

• dev — Caller's Device Node. like, the device node you're rolling up with. 🦋
• index — Index into the array. pick your fave entry, no cap. ✨
• r — Pointer to resource array. this is where the resource is gonna land. 🎀

💖 DESCRIPTION 💖

Returns -EINVAL if the range cannot be converted to resource. yep, that's the error you get when the conversion just refuses to slay. 😭

Note that if your address is a PIO address, the conversion will fail if the physical address can't be internally converted to an IO token with pci_address_to_pio, that is because it's either called too early or it can't be matched to any host bridge IO space. 💀 this is the part where you go "not me calling it too early" — fr fr.

🦋 SEE ALSO 🦋

• Kernel file ./drivers/of/address.c
• of_translate_dma_region(9)
• of_property_read_reg(9)
• of_dma_get_range(9)
• of_dma_get_max_cpu_address(9)
• of_dma_is_coherent(9)
• of_mmio_is_nonposted(9)
• of_iomap(9)

signed off by ./drivers/of · October 2026 · of_address_to_resource(9) — mwah, slay, bye bestie 💋💖🌈