ENUM DPLL_PIN_DIRECTION(9)

🎀 enum dpll_pin_direction(9) 🎀

okay bestie, welcome to the Kernel API Manual — yes, that manual, the one that lives in the kernel source, and today we're doing a little enum that's honestly so babygirl of it. it's called enum dpll_pin_direction and it's here to answer one very simple question: which way does this pin go? 🦋

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✨ NAME ✨

enum dpll_pin_direction — literally defines the possible direction of a pin, and these are the valid values for the DPLL_A_PIN_DIRECTION attribute. that's it. that's the whole vibe check. 💅

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🌸 SYNOPSIS 🌸

enum dpll_pin_direction {
    DPLL_PIN_DIRECTION_INPUT ,
    DPLL_PIN_DIRECTION_OUTPUT

};

look at her. two constants. no drama. no extra fields. she said "I have exactly two moods" and honestly? iconic. 👑

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💖 Constants 💖

okay so these are the two choices, and ngl there are literally only two, so this is a very low-stakes quiz:

• DPLL_PIN_DIRECTION_INPUT — this pin is being used as a input of a signal. she's receiving. she's listening. she's the one getting the text first and forwarding it to the group chat. 🫶
• DPLL_PIN_DIRECTION_OUTPUT — this pin is used to output the signal. she's the sender now, main character energy, pushing the signal out into the world. 🔥

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🌈 SEE ALSO 🌈

if you're obsessed (and you should be), go check out the kernel file ./include/uapi/linux/dpll.h — that's the home base, the source of truth, the mothership. 💜

and then there's the whole friend group, fr fr:

• enum dpll_mode(9)
• enum dpll_lock_status(9)
• enum dpll_lock_status_error(9)
• enum dpll_type(9)
• enum dpll_pin_type(9)
• enum dpll_pin_state(9)
• enum dpll_pin_operstate(9)
• enum dpll_pin_capabilities(9)
• enum dpll_feature_state(9)

like, that's the entire squad right there. go say hi. 🌸

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quick reminder bestie: valid values for DPLL_A_PIN_DIRECTION are exactly those two — DPLL_PIN_DIRECTION_INPUT and DPLL_PIN_DIRECTION_OUTPUT. no third option, no secret menu, no "it depends". 🎀

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and that's the page!! ✨ brought to you by ./include/uapi/linux, dated October 2026, filed under the very official enum dpll_pin_direction(9) — mwah 💋 slay, bye! 🦋💖