| * Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART) |
| |
| Required properties: |
| - compatible: Should be "atmel,<chip>-usart" |
| The compatible <chip> indicated will be the first SoC to support an |
| additional mode or an USART new feature. |
| - reg: Should contain registers location and length |
| - interrupts: Should contain interrupt |
| |
| 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 |
| - 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. |
| |
| <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>; |
| atmel,use-dma-rx; |
| atmel,use-dma-tx; |
| }; |
| |
| - use DMA: |
| usart0: serial@f001c000 { |
| compatible = "atmel,at91sam9260-usart"; |
| reg = <0xf001c000 0x100>; |
| interrupts = <12 4 5>; |
| atmel,use-dma-rx; |
| atmel,use-dma-tx; |
| dmas = <&dma0 2 0x3>, |
| <&dma0 2 0x204>; |
| dma-names = "tx", "rx"; |
| }; |
