STRUCT GPIO_V2_LINE_CONFIG(9)

✨ NAME ✨

struct gpio_v2_line_config — the glow-up config object for your GPIO lines, bestie 💅

Like, it's the struct you fill out when you wanna tell the kernel exactly how you want your lines to behave. Keep reading, it's giving "important" and honestly it is. 🎀

🦋 SYNOPSIS 🦋

struct gpio_v2_line_config {
    __aligned_u64 flags;
    __u32 num_attrs;
    __u32 padding[5];
    struct gpio_v2_line_config_attribute attrs[GPIO_V2_LINE_NUM_ATTRS_MAX];
};

That's the whole vibe. Four fields. No notes. 🌸

💖 MEMBERS 💖

Ok so let's meet the cast, one by one, because each of them matters, no cap:

• flags — the flags for the GPIO lines, and you get the values from enum gpio_v2_line_flag, like GPIO_V2_LINE_FLAG_ACTIVE_LOW, GPIO_V2_LINE_FLAG_OUTPUT etc — and you literally add them together. This is the default for all the requested lines, but bestie listen: it can be overridden for particular lines using attrs. So it's a default, not a forever-decision. 🫶
• num_attrs — the number of attributes in attrs. Just a count. That's it. She's simple, she's iconic. ⭐
• padding — reserved for future use and must be zero filled. Not "should", not "if you feel like it" — must. Zero-fill it or the vibe check fails, fr fr. 🚨
• attrs — the configuration attributes associated with the requested lines. Big important rule incoming: any attribute should only be associated with a particular line once. And if an attribute is associated with a line multiple times, then the first occurrence (i.e. lowest index) has precedence. So the earliest one wins. First come, first served, periodt. 👑

Real talk: that padding field is the one everyone forgets and then wonders why stuff breaks. Zero-fill it. I'm begging. 😭

🌈 SEE ALSO 🌈

Go read these next, they're all in the group chat together:

• Kernel file ./include/uapi/linux/gpio.h
• struct gpiochip_info(9)
• enum gpio_v2_line_flag(9)
• struct gpio_v2_line_values(9)
• enum gpio_v2_line_attr_id(9)
• struct gpio_v2_line_attribute(9)
• struct gpio_v2_line_config_attribute(9)
• struct gpio_v2_line_request(9)
• struct gpio_v2_line_info(9)
• enum gpio_v2_line_changed_type(9)
• struct gpio_v2_line_info_changed(9)
• enum gpio_v2_line_event_id(9)
• struct gpio_v2_line_event(9)
• struct gpioline_info(9)
• struct gpioline_info_changed(9)
• struct gpiohandle_request(9)
• struct gpiohandle_config(9)
• struct gpiohandle_data(9)
• struct gpioevent_request(9)
• struct gpioevent_data(9)

And that's the whole page, bestie!! ✨ This one came straight out of the source at ./include/uapi/linux, dated October 2026, and the header situation is Kernel API Manual — struct gpio_v2_line_config(9) and friends. Mwah. Go configure some lines, you've got this 💜💖🎀