rza1_gpio_get(9)

💅 rza1_gpio_get(9) — bestie's guide to reading a GPIO pin ✨

okay so this is a page from the Kernel API Manual (that's the manual name, yes it's giving "official business" 🎀) and it's about the rza1_gpio_get function. ngl it's a tiny one but it's iconic in its own little way. let's get into it 🦋

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✨ NAME ✨

rza1_gpio_get — read a gpio pin value 👑

like, literally, it goes and finds out what a pin is doing. main character energy fr fr 💅

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🌸 SYNOPSIS 🌸

int rza1_gpio_get (struct gpio_chip *chip , unsigned int gpio );

that's the whole vibe. two args, one int back. no cap 💖

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🎀 ARGUMENTS 🎀

• chip — the gpio chip where the gpio sits on. like, which apartment building is our pin living in 🏢
• gpio — the gpio offset. the unit number within that building, iykyk 🔑

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🦋 DESCRIPTION 🦋

okay so this reads the gpio pin value through the PPR register. that's the whole job, and it slays it ✨

⚠️ but listen bestie, important caveat: it requires bi-directional mode to work when you're reading the value of a pin that's in output mode. so if you're in output mode and not set up bi-directionally, it's not gonna do the thing. don't come for me, come for the hardware 😭

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🌈 SEE ALSO 🌈

the kernel file this lives in is ./drivers/pinctrl/renesas/pinctrl-rza1.c — go read it, it's right there, ate 💀

and the whole friend group it hangs out with:

• struct rza1_mux_conf(9)
• struct rza1_port(9)
• struct rza1_pinctrl(9)
• rza1_pin_reset(9)
• rza1_pin_set_direction(9)
• rza1_pin_mux_single(9)
• rza1_gpio_request(9)
• rza1_gpio_free(9)
• rza1_dt_node_pin_count(9)
• rza1_parse_pinmux_node(9)
• rza1_dt_node_to_map(9)
• rza1_set_mux(9)
• rza1_parse_gpiochip(9)
• rza1_gpio_register(9)
• rza1_pinctrl_register(9)

that's fifteen besties. a whole squad. obsessed 🫶

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so yeah, that's the page. it comes from ./drivers/pinctrl/renesas and it's dated October 2026 — mark your calendars bestie, future vibes only 🗓️💜

mwah, go read your pins, love u, bye 🧚‍♀️💖