projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 0331bbf3 NF |
1 | * Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART) |
| 2 | ||
| 3 | Required properties: | |
| 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 | ||
| 10 | Optional properties: | |
| 11 | - atmel,use-dma-rx: use of PDC or DMA for receiving data | |
| 12 | - atmel,use-dma-tx: use of PDC or DMA for transmitting data | |
| e4697193 ES |
13 | - add dma bindings for dma transfer: |
| 14 | - dmas: DMA specifier, consisting of a phandle to DMA controller node, | |
| 15 | memory peripheral interface and USART DMA channel ID, FIFO configuration. | |
| 16 | Refer to dma.txt and atmel-dma.txt for details. | |
| 17 | - dma-names: "rx" for RX channel, "tx" for TX channel. | |
| 0331bbf3 NF |
18 | |
| 19 | <chip> compatible description: | |
| 20 | - at91rm9200: legacy USART support | |
| 21 | - at91sam9260: generic USART implementation for SAM9 SoCs | |
| 22 | ||
| 23 | Example: | |
| e4697193 | 24 | - use PDC: |
| 0331bbf3 NF |
25 | usart0: serial@fff8c000 { |
| 26 | compatible = "atmel,at91sam9260-usart"; | |
| 27 | reg = <0xfff8c000 0x4000>; | |
| 28 | interrupts = <7>; | |
| 29 | atmel,use-dma-rx; | |
| 30 | atmel,use-dma-tx; | |
| 31 | }; | |
| 32 | ||
| e4697193 ES |
33 | - use DMA: |
| 34 | usart0: serial@f001c000 { | |
| 35 | compatible = "atmel,at91sam9260-usart"; | |
| 36 | reg = <0xf001c000 0x100>; | |
| 37 | interrupts = <12 4 5>; | |
| 38 | atmel,use-dma-rx; | |
| 39 | atmel,use-dma-tx; | |
| 40 | dmas = <&dma0 2 0x3>, | |
| 41 | <&dma0 2 0x204>; | |
| 42 | dma-names = "tx", "rx"; | |
| 43 | }; |