Documentation/devicetree/bindings/serial/st,stm32-usart.txt

   1 * STMicroelectronics STM32 USART
   2
   3 Required 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
  15 Optional 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
  29 Examples:
  30 usart4: 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
  39 usart2: 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
  49 usart1: 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 };