STM32MP13系列的USART控制器dts配置
usart1: serial@4c000000 {
compatible = "st,stm32h7-uart";
reg = <0x4c000000 0x400>;
interrupts-extended = <&exti 26 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc USART1_K>;
resets = <&rcc USART1_R>;
wakeup-source;
power-domains = <&pd_core_ret>;
dmas = <&dmamux1 41 0x400 0x5>,
<&dmamux1 42 0x400 0x1>;
dma-names = "rx", "tx";
status = "disabled";
};