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</pre>
===Userspace gpio access ===
==== Usage with [https://www.kernel.org/doc/Documentation/gpio/sysfs.txt sysfs] ====
===== Additional information =====
Information about GPIOs usage under <code>sysfs </code> directory ''https://www.kernel.org/doc/Documentation/gpio/sysfs.txt''
==== Usage with [https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/tree/README libgpiod] ====
{{WarningMessage|text=''sysfs'' GPIO ABI has been deprecated. See more inofrmation information [https://www.kernel.org/doc/Documentation/gpio/sysfs.rst here] about it. A character device access has to be used, more information [https://embeddedbits.org/new-linux-kernel-gpio-user-space-interface/ here]}}
Information about GPIOs library '''libgpiod''' - C library and tools - can be found on [https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/ git.kernel.org]
===== libgpiod usage example =====
It is possible yo cross-compile <code>libgpiod</code> in the target (if the related Yocto package is not available for installation). Once the ''autoconf-archive'' package has been installed
<pre>
make
make install
</pre>
Once installed, the <code>gpio</code> utilities are availabel in the target: