Kernel-4.18.0-80.el8_st,stm32-usart

• STMicroelectronics STM32 USART

Required properties:

• compatible: can be either:
  • “st,stm32-uart”,
  • “st,stm32f7-uart”,
  • “st,stm32h7-uart”.
    depending is compatible with stm32(f4), stm32f7 or stm32h7.
• reg: The address and length of the peripheral registers space
• interrupts:
  • The interrupt line for the USART instance,
  • An optional wake-up interrupt.
• clocks: The input clock of the USART instance

Optional properties:

• pinctrl: The reference on the pins configuration
• st,hw-flow-ctrl: bool flag to enable hardware flow control.
• rs485-rts-delay, rs485-rx-during-tx, rs485-rts-active-low,
  linux,rs485-enabled-at-boot-time: see rs485.txt.
• dmas: phandle(s) to DMA controller node(s). Refer to stm32-dma.txt
• dma-names: “rx” and/or “tx”

Examples:
usart4: serial@40004c00 {
compatible = “st,stm32-uart”;
reg = <0x40004c00 0x400>;
interrupts = <52>;
clocks = <&clk_pclk1>;
pinctrl-names = “default”;
pinctrl-0 = <&pinctrl_usart4>;
};

usart2: serial@40004400 {
compatible = “st,stm32-uart”;
reg = <0x40004400 0x400>;
interrupts = <38>;
clocks = <&clk_pclk1>;
st,hw-flow-ctrl;
pinctrl-names = “default”;
pinctrl-0 = <&pinctrl_usart2 &pinctrl_usart2_rtscts>;
};

usart1: serial@40011000 {
compatible = “st,stm32-uart”;
reg = <0x40011000 0x400>;
interrupts = <37>;
clocks = <&rcc 0 164>;
dmas = <&dma2 2 4 0x414 0x0>,
<&dma2 7 4 0x414 0x0>;
dma-names = “rx”, “tx”;
};