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- resets: Must contain the phandle to the reset controller. 17- pinctrl: The reference on the pins configuration 18- st,hw-flow-ctrl: bool flag to enable hardware flow control. 19- rs485-rts-delay, rs485-rx-during-tx, rs485-rts-active-low, 20 linux,rs485-enabled-at-boot-time: see rs485.txt. 21- dmas: phandle(s) to DMA controller node(s). Refer to stm32-dma.txt 22- dma-names: "rx" and/or "tx" 23- wakeup-source: bool flag to indicate this device has wakeup capabilities 24- interrupt-names, if optional wake-up interrupt is used, should be: 25 - "event": the name for the interrupt line of the USART instance 26 - "wakeup" the name for the optional wake-up interrupt 27 28 29Examples: 30usart4: serial@40004c00 { 31 compatible = "st,stm32-uart"; 32 reg = <0x40004c00 0x400>; 33 interrupts = <52>; 34 clocks = <&clk_pclk1>; 35 pinctrl-names = "default"; 36 pinctrl-0 = <&pinctrl_usart4>; 37}; 38 39usart2: serial@40004400 { 40 compatible = "st,stm32-uart"; 41 reg = <0x40004400 0x400>; 42 interrupts = <38>; 43 clocks = <&clk_pclk1>; 44 st,hw-flow-ctrl; 45 pinctrl-names = "default"; 46 pinctrl-0 = <&pinctrl_usart2 &pinctrl_usart2_rtscts>; 47}; 48 49usart1: serial@40011000 { 50 compatible = "st,stm32-uart"; 51 reg = <0x40011000 0x400>; 52 interrupts = <37>; 53 clocks = <&rcc 0 164>; 54 dmas = <&dma2 2 4 0x414 0x0>, 55 <&dma2 7 4 0x414 0x0>; 56 dma-names = "rx", "tx"; 57}; 58