Hi danielbujak,
Device tree is an extensive topic. The following document explains how to customize a device tree. In this case the Udoo board is used.
Basic Device Tree for the Udoo Board
For general information about device Tree you may take a look to the links provided at the end of this post:
32Khz clock on CCM_CLKO2 (SD1_WP)
Best regards,
Carlos
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