FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/serial/fsl-lpuart.txt

     * Freescale low power universal asynchronous receiver/transmitter (lpuart)
     
     Required properties:
     - compatible :
       - "fsl,vf610-lpuart" for lpuart compatible with the one integrated
         on Vybrid vf610 SoC with 8-bit register organization
       - "fsl,ls1021a-lpuart" for lpuart compatible with the one integrated
         on LS1021A SoC with 32-bit big-endian register organization
       - "fsl,ls1028a-lpuart" for lpuart compatible with the one integrated
        on LS1028A SoC with 32-bit little-endian register organization
      - "fsl,imx7ulp-lpuart" for lpuart compatible with the one integrated
        on i.MX7ULP SoC with 32-bit little-endian register organization
      - "fsl,imx8qxp-lpuart" for lpuart compatible with the one integrated
        on i.MX8QXP SoC with 32-bit little-endian register organization
      - "fsl,imx8qm-lpuart" for lpuart compatible with the one integrated
        on i.MX8QM SoC with 32-bit little-endian register organization
    - reg : Address and length of the register set for the device
    - interrupts : Should contain uart interrupt
    - clocks : phandle + clock specifier pairs, one for each entry in clock-names
    - clock-names : For vf610/ls1021a/ls1028a/imx7ulp, "ipg" clock is for uart
      bus/baud clock. For imx8qxp lpuart, "ipg" clock is bus clock that is used
      to access lpuart controller registers, it also requires "baud" clock for
      module to receive/transmit data.
    
    Optional properties:
    - dmas: A list of two dma specifiers, one for each entry in dma-names.
    - dma-names: should contain "tx" and "rx".
    - rs485-rts-active-low, linux,rs485-enabled-at-boot-time: see rs485.txt
    
    Note: Optional properties for DMA support. Write them both or both not.
    
    Example:
    
    uart0: serial@40027000 {
                    compatible = "fsl,vf610-lpuart";
                    reg = <0x40027000 0x1000>;
                    interrupts = <0 61 0x00>;
                    clocks = <&clks VF610_CLK_UART0>;
                    clock-names = "ipg";
                    dmas = <&edma0 0 2>,
                            <&edma0 0 3>;
                    dma-names = "rx","tx";
            };

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