ENUM UART_PM_STATE(9)

🦋 enum uart_pm_state(9) 🦋

okay so this is from the Kernel API Manual bestie, and it's literally just the vibe check for your UART's power situation 💅

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✨ NAME ✨

enum uart_pm_state — power states for UARTs ⚡

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✨ SYNOPSIS ✨

enum uart_pm_state {
    UART_PM_STATE_ON ,
    UART_PM_STATE_OFF ,
    UART_PM_STATE_UNDEFINED

};

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✨ Constants ✨

like, three whole moods and that's it 🎀

• UART_PM_STATE_ON — UART is powered, up and operational 🔥 she's awake, she's thriving, main character energy fr
• UART_PM_STATE_OFF — UART is powered off 😴 not me being asleep, no cap, fully unpowered
• UART_PM_STATE_UNDEFINED — sentinel 👀 the "idk her yet" placeholder, the little default icon of the group

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/serial_core.h

and then the whole friend group, iykyk:

• struct uart_ops(9)
• uart_port_set_cons(9)
• uart_port_lock(9)
• uart_port_lock_irq(9)
• uart_port_lock_irqsave(9)
• uart_port_trylock(9)
• uart_port_trylock_irqsave(9)
• uart_port_unlock(9)
• uart_port_unlock_irq(9)
• uart_port_unlock_irqrestore(9)
• uart_xmit_advance(9)
• enum UART_TX_FLAGS(9)
• uart_port_tx_limited(9)
• uart_port_tx_limited_flags(9)
• uart_port_tx(9)
• uart_port_tx_flags(9)

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🫶 lowkey go read the whole squad, they're all iconic, not a single flop in that list

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okay that's the whole page bestie, no crumbs left 💖 this one lives in ./include/linux, version tucked in October 2026, and it's filed under enum uart_pm_state(9) — slay, bye 👑✨