1* STMicroelectronics STM32 USART
2
3Required properties:
4- compatible: can be either:
5  - "st,stm32-uart",
6  - "st,stm32f7-uart",
7  - "st,stm32h7-uart".
8  depending is compatible with stm32(f4), stm32f7 or stm32h7.
9- reg: The address and length of the peripheral registers space
10- interrupts:
11  - The interrupt line for the USART instance,
12  - An optional wake-up interrupt.
13- clocks: The input clock of the USART instance
14
15Optional properties:
16- pinctrl: The reference on the pins configuration
17- st,hw-flow-ctrl: bool flag to enable hardware flow control.
18- rs485-rts-delay, rs485-rx-during-tx, rs485-rts-active-low,
19  linux,rs485-enabled-at-boot-time: see rs485.txt.
20- dmas: phandle(s) to DMA controller node(s). Refer to stm32-dma.txt
21- dma-names: "rx" and/or "tx"
22
23Examples:
24usart4: serial@40004c00 {
25	compatible = "st,stm32-uart";
26	reg = <0x40004c00 0x400>;
27	interrupts = <52>;
28	clocks = <&clk_pclk1>;
29	pinctrl-names = "default";
30	pinctrl-0 = <&pinctrl_usart4>;
31};
32
33usart2: serial@40004400 {
34	compatible = "st,stm32-uart";
35	reg = <0x40004400 0x400>;
36	interrupts = <38>;
37	clocks = <&clk_pclk1>;
38	st,hw-flow-ctrl;
39	pinctrl-names = "default";
40	pinctrl-0 = <&pinctrl_usart2 &pinctrl_usart2_rtscts>;
41};
42
43usart1: serial@40011000 {
44	compatible = "st,stm32-uart";
45	reg = <0x40011000 0x400>;
46	interrupts = <37>;
47	clocks = <&rcc 0 164>;
48	dmas = <&dma2 2 4 0x414 0x0>,
49	       <&dma2 7 4 0x414 0x0>;
50	dma-names = "rx", "tx";
51};
52