1 * Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
4 - compatible: Should be "atmel,<chip>-usart"
5 The compatible <chip> indicated will be the first SoC to support an
6 additional mode or an USART new feature.
7 - reg: Should contain registers location and length
8 - interrupts: Should contain interrupt
9 - clock-names: tuple listing input clock names.
10 Required elements: "usart"
11 - clocks: phandles to input clocks.
14 - atmel,use-dma-rx: use of PDC or DMA for receiving data
15 - atmel,use-dma-tx: use of PDC or DMA for transmitting data
16 - rts-gpios: specify a GPIO for RTS line. It will use specified PIO instead of the peripheral
17 function pin for the USART RTS feature. If unsure, don't specify this property.
18 - add dma bindings for dma transfer:
19 - dmas: DMA specifier, consisting of a phandle to DMA controller node,
20 memory peripheral interface and USART DMA channel ID, FIFO configuration.
21 Refer to dma.txt and atmel-dma.txt for details.
22 - dma-names: "rx" for RX channel, "tx" for TX channel.
24 <chip> compatible description:
25 - at91rm9200: legacy USART support
26 - at91sam9260: generic USART implementation for SAM9 SoCs
30 usart0: serial@fff8c000 {
31 compatible = "atmel,at91sam9260-usart";
32 reg = <0xfff8c000 0x4000>;
34 clocks = <&usart0_clk>;
35 clock-names = "usart";
38 rts-gpios = <&pioD 15 0>;
42 usart0: serial@f001c000 {
43 compatible = "atmel,at91sam9260-usart";
44 reg = <0xf001c000 0x100>;
45 interrupts = <12 4 5>;
46 clocks = <&usart0_clk>;
47 clock-names = "usart";
52 dma-names = "tx", "rx";