* Freescale MXS Application UART (AUART) Required properties for all SoCs: - compatible : Should be one of fallowing variants: "fsl,imx23-auart" - Freescale i.MX23 "fsl,imx28-auart" - Freescale i.MX28 "alphascale,asm9260-auart" - Alphascale ASM9260 - reg : Address and length of the register set for the device - interrupts : Should contain the auart interrupt numbers - dmas: DMA specifier, consisting of a phandle to DMA controller node and AUART DMA channel ID. Refer to dma.txt and fsl-mxs-dma.txt for details. - dma-names: "rx" for RX channel, "tx" for TX channel. Required properties for "alphascale,asm9260-auart": - clocks : the clocks feeding the watchdog timer. See clock-bindings.txt - clock-names : should be set to "mod" - source for tick counter. "ahb" - ahb gate. Optional properties: - uart-has-rtscts : Indicate the UART has RTS and CTS lines for hardware flow control, it also means you enable the DMA support for this UART. - {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD line respectively. It will use specified PIO instead of the peripheral function pin for the USART feature. If unsure, don't specify this property. Example: auart0: serial@8006a000 { compatible = "fsl,imx28-auart", "fsl,imx23-auart"; reg = <0x8006a000 0x2000>; interrupts = <112>; dmas = <&dma_apbx 8>, <&dma_apbx 9>; dma-names = "rx", "tx"; cts-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>; dsr-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>; dcd-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>; }; Note: Each auart port should have an alias correctly numbered in "aliases" node. Example: aliases { serial0 = &auart0; serial1 = &auart1; serial2 = &auart2; serial3 = &auart3; serial4 = &auart4; };