tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1* Freescale MXS Application UART (AUART)
2
3Required properties:
4- compatible : Should be "fsl,<soc>-auart". The supported SoCs include
5 imx23 and imx28.
6- reg : Address and length of the register set for the device
7- interrupts : Should contain the auart interrupt numbers
8- dmas: DMA specifier, consisting of a phandle to DMA controller node
9 and AUART DMA channel ID.
10 Refer to dma.txt and fsl-mxs-dma.txt for details.
11- dma-names: "rx" for RX channel, "tx" for TX channel.
12
13Optional properties:
14- fsl,uart-has-rtscts : Indicate the UART has RTS and CTS lines
15 for hardware flow control,
16 it also means you enable the DMA support for this UART.
17- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD
18 line respectively. It will use specified PIO instead of the peripheral
19 function pin for the USART feature.
20 If unsure, don't specify this property.
21
22Example:
23auart0: serial@8006a000 {
24 compatible = "fsl,imx28-auart", "fsl,imx23-auart";
25 reg = <0x8006a000 0x2000>;
26 interrupts = <112>;
27 dmas = <&dma_apbx 8>, <&dma_apbx 9>;
28 dma-names = "rx", "tx";
29 cts-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
30 dsr-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
31 dcd-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>;
32};
33
34Note: Each auart port should have an alias correctly numbered in "aliases"
35node.
36
37Example:
38
39aliases {
40 serial0 = &auart0;
41 serial1 = &auart1;
42 serial2 = &auart2;
43 serial3 = &auart3;
44 serial4 = &auart4;
45};