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-* Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
-
-Required properties:
-- compatible: Should be "atmel,<chip>-usart" or "atmel,<chip>-dbgu"
- The compatible <chip> indicated will be the first SoC to support an
- additional mode or an USART new feature.
- For the dbgu UART, use "atmel,<chip>-dbgu", "atmel,<chip>-usart"
-- reg: Should contain registers location and length
-- interrupts: Should contain interrupt
-- clock-names: tuple listing input clock names.
- Required elements: "usart"
-- clocks: phandles to input clocks.
-
-Optional properties:
-- atmel,use-dma-rx: use of PDC or DMA for receiving data
-- atmel,use-dma-tx: use of PDC or DMA for transmitting data
-- {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.
-- add dma bindings for dma transfer:
- - dmas: DMA specifier, consisting of a phandle to DMA controller node,
- memory peripheral interface and USART DMA channel ID, FIFO configuration.
- Refer to dma.txt and atmel-dma.txt for details.
- - dma-names: "rx" for RX channel, "tx" for TX channel.
-- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
- capable USARTs.
-- rs485-rts-delay, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt
-
-<chip> compatible description:
-- at91rm9200: legacy USART support
-- at91sam9260: generic USART implementation for SAM9 SoCs
-
-Example:
-- use PDC:
- usart0: serial@fff8c000 {
- compatible = "atmel,at91sam9260-usart";
- reg = <0xfff8c000 0x4000>;
- interrupts = <7>;
- clocks = <&usart0_clk>;
- clock-names = "usart";
- atmel,use-dma-rx;
- atmel,use-dma-tx;
- rts-gpios = <&pioD 15 GPIO_ACTIVE_LOW>;
- cts-gpios = <&pioD 16 GPIO_ACTIVE_LOW>;
- dtr-gpios = <&pioD 17 GPIO_ACTIVE_LOW>;
- dsr-gpios = <&pioD 18 GPIO_ACTIVE_LOW>;
- dcd-gpios = <&pioD 20 GPIO_ACTIVE_LOW>;
- rng-gpios = <&pioD 19 GPIO_ACTIVE_LOW>;
- };
-
-- use DMA:
- usart0: serial@f001c000 {
- compatible = "atmel,at91sam9260-usart";
- reg = <0xf001c000 0x100>;
- interrupts = <12 4 5>;
- clocks = <&usart0_clk>;
- clock-names = "usart";
- atmel,use-dma-rx;
- atmel,use-dma-tx;
- dmas = <&dma0 2 0x3>,
- <&dma0 2 0x204>;
- dma-names = "tx", "rx";
- atmel,fifo-size = <32>;
- };