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* 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:
- resets: Must contain the phandle to the reset controller.
- 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";
};
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