1OMAP UART controller 2 3Required properties: 4- compatible : should be "ti,j721e-uart", "ti,am654-uart" for J721E controllers 5- compatible : should be "ti,am654-uart" for AM654 controllers 6- compatible : should be "ti,omap2-uart" for OMAP2 controllers 7- compatible : should be "ti,omap3-uart" for OMAP3 controllers 8- compatible : should be "ti,omap4-uart" for OMAP4 controllers 9- compatible : should be "ti,am4372-uart" for AM437x controllers 10- compatible : should be "ti,am3352-uart" for AM335x controllers 11- compatible : should be "ti,dra742-uart" for DRA7x controllers 12- reg : address and length of the register space 13- interrupts or interrupts-extended : Should contain the uart interrupt 14 specifier or both the interrupt 15 controller phandle and interrupt 16 specifier. 17- ti,hwmods : Must be "uart<n>", n being the instance number (1-based) 18 19Optional properties: 20- clock-frequency : frequency of the clock input to the UART 21- dmas : DMA specifier, consisting of a phandle to the DMA controller 22 node and a DMA channel number. 23- dma-names : "rx" for receive channel, "tx" for transmit channel. 24- rs485-rts-delay, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt 25- rs485-rts-active-high: drive RTS high when sending (default is low). 26- clocks: phandle to the functional clock as per 27 Documentation/devicetree/bindings/clock/clock-bindings.txt 28 29Example: 30 31 uart4: serial@49042000 { 32 compatible = "ti,omap3-uart"; 33 reg = <0x49042000 0x400>; 34 interrupts = <80>; 35 dmas = <&sdma 81 &sdma 82>; 36 dma-names = "tx", "rx"; 37 ti,hwmods = "uart4"; 38 clock-frequency = <48000000>; 39 }; 40