STRUCT GPIOD_LOOKUP(9)

✨ NAME ✨

struct gpiod_lookup — it's the lookup table, bestie 💅 (and yes, this is the struct gpiod_lookup(9) page from the Kernel API Manual, we're getting into it)

🎀 SYNOPSIS 🎀

struct gpiod_lookup {
    const char *key;
    u16 chip_hwnum;
    const char *con_id;
    unsigned int idx;
    unsigned long flags;
};

🦋 Members 🦋

• key — ngl this one's doing double duty 👑 It's either the name of the chip the GPIO belongs to, or the GPIO line name. But listen — GPIO line names are not guaranteed to be globally unique, so this is gonna use the first match found! No cap, first one wins, that's just how it is 😭
• chip_hwnum — the hardware number of the GPIO, i.e. relative to the chip 🧚 Or you can drop U16_MAX in here to say "hey, key is actually a GPIO line name" 💀
• con_id — the name of the GPIO from the device's point of view 🫶 Like, how the device sees it, not the chip.
• idx — the index of the GPIO, for when several GPIOs are sharing the same name 🙈 (squad goals but make it ambiguous)
• flags — a bitmask of gpio_lookup_flags GPIO_* values ⭐

🌸 Description 🌸

Okay so gpiod_lookup is literally a lookup table for associating GPIOs to specific devices and functions using platform data ✨ That's the whole vibe. It's the little matchmaker between your GPIOs and the devices that need them 💖

🌈 SEE ALSO 🌈

• Kernel file ./include/linux/gpio/machine.h 👑

That's the whole page, bestie — no crumbs left 💅 Sending you off with the source/version line: this lil beauty lives in ./include/linux/gpio and it's stamped October 2026 🎀 Now go forth and lookup, you icon 🦋✨