STRUCT EXAR8250_BOARD(9)

💜 struct exar8250_board(9) — board information

okay bestie, so this is a page straight outta the Kernel API Manual, and it's all about struct exar8250_board — the little info blob that tells the Exar 8250 driver what kind of board it's dealing with. board information, that's the whole vibe. 🫶

✨ SYNOPSIS ✨

struct exar8250_board {
    unsigned int num_ports;
    unsigned int reg_shift;
    int (*setup)(struct exar8250 *priv, struct pci_dev *pcidev, struct
uart_8250_port *port, int idx);
    void (*exit)(struct pci_dev *pcidev);
 };

like, that's the whole struct, no notes. 💅 (yes, unsigned int num_ports; — shoutout to unsigned int for always showing up.)

🌸 Members 🌸

• num_ports — literally the number of serial ports. that's it. that's the field. count 'em. 🔢
• reg_shift — this one describes the UART register mapping in PCI memory. it's giving "how do I find my registers in this PCI blob" energy. 🗺️
• setup — a quirk that gets run at the ->probe stage, for each port. it's a function pointer shaped like int (*)(struct exar8250 *priv, struct pci_dev *pcidev, struct uart_8250_port *port, int idx) — so yeah, it takes priv, pcidev, port, and idx, and returns an int. main character of the probe phase fr. 🌟
• exit — the quirk that runs at the ->remove stage. signature is void (*)(struct pci_dev *pcidev) — void, takes pcidev, says bye. 💀 clean up after yourself queen.

🦋 SEE ALSO 🦋

• Kernel file ./drivers/tty/serial/8250/8250_exar.c — go read the source, iykyk 👀
• exar_mpio_config_output(9)
• _exar_mpio_set(9)
• cti_tristate_disable(9)
• cti_plx_int_enable(9)
• cti_read_osc_freq(9)
• cti_get_port_type_xr17c15x_xr17v25x(9)
• cti_get_port_type_fpga(9)
• cti_get_port_type_xr17v35x(9)

like. that's a whole friend group of cti_* functions and honestly they ate. 🔥

ngl the vibes here are very "hardware driver internals" and that's iconic of you to be reading. no cap, this is the good stuff. 🧚

anyway, that's the page! 💖 it lives under ./drivers/tty/serial/8250, dated October 2026, and yes the title is struct exar8250_board(9) — slay, periodt. 🎀🌈⭐