kernel-brax3-ubuntu-touch/Documentation/ABI/testing/gpio-cdev
erascape f319b992b1 kernel-5.15: Initial import brax3 UT kernel
* halium configs enabled

Signed-off-by: erascape <erascape@proton.me>
2025-09-23 15:17:10 +00:00

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What: /dev/gpiochip[0-9]+
Date: November 2015
KernelVersion: 4.4
Contact: linux-gpio@vger.kernel.org
Description:
The character device files /dev/gpiochip* are the interface
between GPIO chips and userspace.
The ioctl(2)-based ABI is defined and documented in
[include/uapi]<linux/gpio.h>.
The following file operations are supported:
open(2)
Currently the only useful flags are O_RDWR.
ioctl(2)
Initiate various actions.
See the inline documentation in [include/uapi]<linux/gpio.h>
for descriptions of all ioctls.
close(2)
Stops and free up the I/O contexts that was associated
with the file descriptor.
Users: TBD