pinmux_can_be_used_for_gpio(9)

💅 pinmux_can_be_used_for_gpio(9) — a Kernel API Manual moment 🎀

okay so bestie, this is a page straight out of the Kernel API Manual and it's genuinely such a little icon. it's about one function, and its whole job is answering one (1) question: is this pin busy doing something else, or is it out here living its gpio life? let's get into it ✨

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🌸 NAME 🌸

pinmux_can_be_used_for_gpio — check if a specific pin is either muxed to a different function or used as gpio.

like, that's the whole vibe check. muxed elsewhere? already gpio? this function wants to know 🫶

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✨ SYNOPSIS ✨

bool pinmux_can_be_used_for_gpio (struct pinctrl_dev *pctldev , unsigned
int pin );

so it hands you back a bool, and it takes a struct pinctrl_dev *pctldev plus an unsigned int pin. that's it. no cap 🦋

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🎀 ARGUMENTS 🎀

• pctldev — the associated pin controller device. like, the controller this whole situation belongs to 👑
• pin — the pin number in the global pin space. yes, global. it's not a little local number, it's the big-world pin number 🌈

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💖 DESCRIPTION 💖

here's the tea: controllers that are not defined as strict will always return true — meaning that the gpio can be used. always. every time. no drama, no checking, just true and move on 😌

so if your controller isn't strict, this function is basically that friend who says "yeah babe go for it" before you've even finished the sentence 💀

ngl, the takeaway is the strict vs not strict distinction — the non-strict ones don't gatekeep, they return true and let the gpio be used, periodt.

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🔥 SEE ALSO 🔥

lowkey a whole friend group, iykyk:

• Kernel file ./drivers/pinctrl/pinmux.c
• pin_request(9)
• pin_free(9)
• pinmux_request_gpio(9)
• pinmux_free_gpio(9)
• pinmux_gpio_direction(9)
• pinmux_generic_get_function_count(9)
• pinmux_generic_get_function_name(9)
• pinmux_generic_get_function_groups(9)
• pinmux_generic_get_function(9)
• pinmux_generic_function_is_gpio(9)
• pinmux_generic_add_function(9)
• pinmux_generic_add_pinfunction(9)
• pinmux_generic_remove_function(9)
• pinmux_generic_free_functions(9)

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and that's the page, bestie 💜 sourced from ./drivers/pinctrl, dated October 2026, and filed under pinmux_can_be_used_for_gpio(9) — slay, go read the whole pinmux cinematic universe 🧚⭐