of_pci_get_devfn(9)

💖 of_pci_get_devfn(9) 💖

okay so welcome to the Kernel API Manual, bestie — this is the page for of_pci_get_devfn(9), and it's literally here to help you get device and function numbers for a device node. slay. ✨

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🌸 NAME 🌸

of_pci_get_devfn — get device and function numbers for a device node 🎀

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✨ SYNOPSIS ✨

int of_pci_get_devfn (struct device_node *np );

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🎀 ARGUMENTS 🎀

• np — device node. like, the node you're interrogating 💅

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🦋 DESCRIPTION 🦋

okay so here's the tea: this function parses a standard 5-cell PCI resource and returns an 8-bit value. that value can then be passed to the PCI_SLOT and PCI_FUNC macros to extract the device and function numbers respectively. iconic behavior, honestly. 💖

and if something goes wrong? on error, a negative error code is returned. no cap. 😭

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🌈 SEE ALSO 🌈

Kernel file ./drivers/pci/of.c, plus the whole friend group:

• pci_set_of_node(9)
• of_pci_parse_bus_range(9)
• of_get_pci_domain_nr(9)
• of_pci_preserve_config(9)
• of_pci_check_probe_only(9)
• devm_of_pci_get_host_bridge_resources(9)
• of_irq_parse_pci(9)
• of_irq_parse_and_map_pci(9)
• of_pci_supply_present(9)
• of_pci_get_max_link_speed(9)
• of_pci_get_slot_power_limit(9)
• of_pci_get_equalization_presets(9)

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and that's the whole vibe, bestie 🫶 this page comes from ./drivers/pci, dated October 2026, and it's living in the Kernel API Manual — of_pci_get_devfn(9) signing off 💜