uart_get_divisor(9)

✨ uart_get_divisor(9) ✨

okay so real quick — this is a page from the Kernel API Manual, and it's all about uart_get_divisor, bestie. it's a tiny little function with one job and honestly it ate 💅

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🌸 NAME 🌸

uart_get_divisor — returns the uart clock divisor, that's it, that's the whole vibe 🎀

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🦋 SYNOPSIS 🦋

unsigned int uart_get_divisor (struct uart_port *port , unsigned int baud );

like look at her, so compact, so iconic 👑

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💖 ARGUMENTS 💖

• port — the uart_port structure that describes the port. she's the main character here, she holds all the info about which port we're talking about 🫶
• baud — the baud rate you actually want. the dream rate. the goal 🌈

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⭐ DESCRIPTION ⭐

so what it does: it calculates the divisor for the baud rate you passed in, using baud_base / baud, and it rounds it appropriately. ngl that's the whole thing 💀

and then there's this one little special case, okay, pay attention:

if it's 38400 baud and a custom divisor is selected, it returns the custom divisor instead. not the calculated one. the custom one. periodt 💅

Locking: caller dependent. and yes that means exactly what it sounds like — whether any locking happens is on whoever's calling it. no cap, that's your problem, not hers 🙈

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🔥 SEE ALSO 🔥

kernel file ./drivers/tty/serial/serial_core.c — and honestly the whole friend group is here, so let me introduce everyone:

• uart_write_wakeup(9)
• uart_update_timeout(9)
• uart_get_baud_rate(9)
• uart_get_lsr_info(9)
• uart_console_write(9)
• uart_parse_earlycon(9)
• uart_parse_options(9)
• uart_set_options(9)
• uart_change_pm(9)
• uart_register_driver(9)
• uart_unregister_driver(9)
• serial_core_add_one_port(9)
• serial_core_remove_one_port(9)
• uart_match_port(9)
• uart_handle_dcd_change(9)
• uart_handle_cts_change(9)
• uart_insert_char(9)
• uart_try_toggle_sysrq(9)
• uart_get_rs485_mode(9)

every single one, no skips, we don't do that here 🧚

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and that's the page!! lived in ./drivers/tty/serial, dated October 2026 — mwah, sending you off with a kiss, go divide some clocks bestie 💜🎀✨