1. 根目录:
2. Documentation
3. devicetree
4. bindings
5. serial
6. altera_uart.txt

Altera UART

Required properties:
- compatible : should be "ALTR,uart-1.0" <DEPRECATED>
- compatible : should be "altr,uart-1.0"

Optional properties:
- clock-frequency : frequency of the clock input to the UART