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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};