STRUCT MCI_SLOT_PDATA(9)

👑 struct mci_slot_pdata(9) — bestie's guide to per-slot config ✨

okay so this is a page from the Kernel API Manual (struct mci_slot_pdata(9)), and it's literally just describing a lil struct that holds board-specific per-slot configuration. very demure, very mindful. let's get into it 🎀

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🌸 NAME 🌸

struct mci_slot_pdata — board-specific per-slot configuration 💅

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✨ SYNOPSIS ✨

struct mci_slot_pdata {
    unsigned int            bus_width;
    struct gpio_desc        *detect_pin;
    struct gpio_desc        *wp_pin;
    bool non_removable;
 };

no cap, that's the whole struct. four fields. she's compact and she knows it 🫶

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🦋 Members 🦋

• bus_width — how many data lines are actually wired up the slot. count 'em 🔢
• detect_pin — the GPIO pin that's wired to the card detect switch. she's the one who notices when a card shows up 👀
• wp_pin — the GPIO pin wired to the write protect sensor. protect the writes, protect the vibe 🔥
• non_removable — the slot is not removable, so only detect once. main character energy: she stays put 💀

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💜 Description 💜

okay so if a given slot is not present on the board, set bus_width to 0. and when you do that, the other fields are just ignored — literally they don't matter at all in this case, so don't stress about them 🙈

any pins that aren't available? set them to a negative value. negative. like, "this pin is not the vibe" negative 🍓

⚠️ heads up bestie: support for multiple slots is experimental — some cards might get upset if we don't get the clock management exactly right. ngl that's a real risk 😭 but in most cases, it should work just fine. she usually slays ✨

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/mmc/host/atmel-mci.c 📁
• struct atmel_mci(9)
• struct atmel_mci_slot(9)

go read those next, iykyk 💖

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and that's the whole page, bestie! sources say this one lives in ./drivers/mmc/host, dated October 2026, and yes — she's struct mci_slot_pdata(9), iconic from start to finish 👑⭐