1* Freescale MXS Application UART (AUART) 2 3Required properties for all SoCs: 4- compatible : Should be one of fallowing variants: 5 "fsl,imx23-auart" - Freescale i.MX23 6 "fsl,imx28-auart" - Freescale i.MX28 7 "alphascale,asm9260-auart" - Alphascale ASM9260 8- reg : Address and length of the register set for the device 9- interrupts : Should contain the auart interrupt numbers 10- dmas: DMA specifier, consisting of a phandle to DMA controller node 11 and AUART DMA channel ID. 12 Refer to dma.txt and fsl-mxs-dma.txt for details. 13- dma-names: "rx" for RX channel, "tx" for TX channel. 14 15Required properties for "alphascale,asm9260-auart": 16- clocks : the clocks feeding the watchdog timer. See clock-bindings.txt 17- clock-names : should be set to 18 "mod" - source for tick counter. 19 "ahb" - ahb gate. 20 21Optional properties: 22- uart-has-rtscts : Indicate the UART has RTS and CTS lines 23 for hardware flow control, 24 it also means you enable the DMA support for this UART. 25- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD 26 line respectively. It will use specified PIO instead of the peripheral 27 function pin for the USART feature. 28 If unsure, don't specify this property. 29 30Example: 31auart0: serial@8006a000 { 32 compatible = "fsl,imx28-auart", "fsl,imx23-auart"; 33 reg = <0x8006a000 0x2000>; 34 interrupts = <112>; 35 dmas = <&dma_apbx 8>, <&dma_apbx 9>; 36 dma-names = "rx", "tx"; 37 cts-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>; 38 dsr-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>; 39 dcd-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>; 40}; 41 42Note: Each auart port should have an alias correctly numbered in "aliases" 43node. 44 45Example: 46 47aliases { 48 serial0 = &auart0; 49 serial1 = &auart1; 50 serial2 = &auart2; 51 serial3 = &auart3; 52 serial4 = &auart4; 53}; 54