BananaPro/Pi: GPIO library

This page provides GPIO library notes for Banana Pro / Banana Pi and links to upstream documentation.

Quick guidance

• Prefer stable kernel interfaces (sysfs is legacy; character device interfaces are now common).
• If you need fast GPIO, confirm pinmux and kernel driver support.

Authoritative references

• Linux kernel GPIO documentation: https://docs.kernel.org/
• U-Boot docs (pinmux concepts): https://docs.u-boot.org/