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+.. SPDX-License-Identifier: GPL-2.0
+
+==================
+Obsolete GPIO APIs
+==================
+
+.. toctree::
+ :maxdepth: 1
+
+ Character Device Userspace API (v1) <../../userspace-api/gpio/chardev_v1>
+ Sysfs Interface <../../userspace-api/gpio/sysfs>
+ Mockup Testing Module <gpio-mockup>
+