mctrl_gpio_init(9)

💖 NAME 💖

okay so this is mctrl_gpio_init(9) from the Kernel API Manual, and its whole job is literally initialize uart gpios. That's the name, that's the assignment, periodt. 💅

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✨ SYNOPSIS ✨

Here's the call, bestie — copy it exactly, no gremlin edits:

struct mctrl_gpios * mctrl_gpio_init (struct uart_port *port , unsigned
       int idx );

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🎀 ARGUMENTS 🎀

• port — the port you're initializing gpios for, bestie. 🫶
• idx — index of the gpio in the port's device. Lowkey important.

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🦋 DESCRIPTION 🦋

okay so what it does: it will get the {cts,rts,...}-gpios from the device tree if they are present, request them, set direction etc, and return an allocated structure. The way it's giving "I got you" ✨

It uses devm_* functions, so there's no need to explicitly free — that's the whole point of devm_* here. 💅

⚠️ important vibe check: this sets up the irq handling, so make sure to not handle changes to the gpio input lines in your driver, too. Like, don't also go doing that, bestie — that's the caution fr fr. 😭

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/tty/serial/serial_mctrl_gpio.c 👀
• mctrl_gpio_set(9)
• mctrl_gpio_to_gpiod(9)
• mctrl_gpio_get(9)
• mctrl_gpio_enable_ms(9)
• mctrl_gpio_disable_ms_sync(9)
• mctrl_gpio_disable_ms_no_sync(9)

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made with 💖 and group-chat energy · source/version: ./drivers/tty/serial · date: October 2026 · page: mctrl_gpio_init(9) 🎀