1* Freescale low power universal asynchronous receiver/transmitter (lpuart) 2 3Required properties: 4- compatible : 5 - "fsl,vf610-lpuart" for lpuart compatible with the one integrated 6 on Vybrid vf610 SoC with 8-bit register organization 7 - "fsl,ls1021a-lpuart" for lpuart compatible with the one integrated 8 on LS1021A SoC with 32-bit big-endian register organization 9 - "fsl,ls1028a-lpuart" for lpuart compatible with the one integrated 10 on LS1028A SoC with 32-bit little-endian register organization 11 - "fsl,imx7ulp-lpuart" for lpuart compatible with the one integrated 12 on i.MX7ULP SoC with 32-bit little-endian register organization 13 - "fsl,imx8qxp-lpuart" for lpuart compatible with the one integrated 14 on i.MX8QXP SoC with 32-bit little-endian register organization 15 - "fsl,imx8qm-lpuart" for lpuart compatible with the one integrated 16 on i.MX8QM SoC with 32-bit little-endian register organization 17- reg : Address and length of the register set for the device 18- interrupts : Should contain uart interrupt 19- clocks : phandle + clock specifier pairs, one for each entry in clock-names 20- clock-names : For vf610/ls1021a/ls1028a/imx7ulp, "ipg" clock is for uart 21 bus/baud clock. For imx8qxp lpuart, "ipg" clock is bus clock that is used 22 to access lpuart controller registers, it also requires "baud" clock for 23 module to receive/transmit data. 24 25Optional properties: 26- dmas: A list of two dma specifiers, one for each entry in dma-names. 27- dma-names: should contain "tx" and "rx". 28- rs485-rts-active-low, linux,rs485-enabled-at-boot-time: see rs485.txt 29 30Note: Optional properties for DMA support. Write them both or both not. 31 32Example: 33 34uart0: serial@40027000 { 35 compatible = "fsl,vf610-lpuart"; 36 reg = <0x40027000 0x1000>; 37 interrupts = <0 61 0x00>; 38 clocks = <&clks VF610_CLK_UART0>; 39 clock-names = "ipg"; 40 dmas = <&edma0 0 2>, 41 <&edma0 0 3>; 42 dma-names = "rx","tx"; 43 }; 44