An introduction to devicetrees in the Zephyr RTOS, covering DTS/DTSI syntax, file hierarchy in the Zephyr repository, and how to use the gpio_dt API in firmware. Uses the Nordic nRF52840 development kit and the blinky example to show how LEDs and GPIOs are described in a devicetree and accessed in C source code. Also highlights key differences between Zephyr's devicetree usage and Linux's.
