serial8250_...er_8250_port(9)

✨ NAME ✨

serial8250_register_8250_port — bestie, this is the one that literally registers a serial port 💅

(also hi, welcome to the Kernel API Manual, section 9, we're in the kernel docs now, put your hair up 🎀)

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🌸 SYNOPSIS 🌸

int serial8250_register_8250_port (const struct uart_8250_port *up );

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🦋 ARGUMENTS 🦋

• up — the serial port template 🫶 like, the blueprint version of the port you want to bring into the world.

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💖 DESCRIPTION 💖

okay so, first thing: it configures the serial port specified by the request ✨. And if the port already exists and is in use? 😭 Not me having to say this, but it gets hung up and unregistered first. No cap, it just does that. Bye to the old one 👋

Then the port is probed, and if necessary the IRQ is autodetected 🔍 — like the kernel just sniffs out which interrupt line it should be on, main character energy. If that fails, an error is returned 💀 (sorry bestie).

But on success? 🌈 The port is ready to use and — drumroll — the line number is returned. That's the return value. That's your little reward. Iconic.

⚠️ fr fr read it again: error = it failed at probe/IRQ autodetect time, line number = it worked. Don't mix them up 🙈

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🎀 SEE ALSO 🎀

• Kernel file ./drivers/tty/serial/8250/8250_core.c — the source, go read it, iykyk 📖
• serial8250_get_port(9)
• univ8250_console_match(9)
• serial8250_suspend_port(9)
• serial8250_resume_port(9)
• serial8250_unregister_port(9)

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and that's the whole vibe check 🧚💜 this gem lives in ./drivers/tty/serial/8250, and this particular slay of a page is dated October 2026 — stay hydrated, keep your IRQs autodetected, and ily, bye 🍓💅