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serial: at91: add dma support in usart binding descriptions

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Signed-off-by: Elen Song <elen.song@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Elen Song 2013-07-22 16:30:31 +08:00 committed by Greg Kroah-Hartman
parent 2e68c22fde
commit e469719344
1 changed files with 17 additions and 1 deletions
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18
Documentation/devicetree/bindings/tty/serial/atmel-usart.txt
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@ -10,13 +10,18 @@ Required properties:
Optional properties: Optional properties:
- atmel,use-dma-rx: use of PDC or DMA for receiving data - atmel,use-dma-rx: use of PDC or DMA for receiving data
- atmel,use-dma-tx: use of PDC or DMA for transmitting 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: <chip> compatible description:
- at91rm9200: legacy USART support - at91rm9200: legacy USART support
- at91sam9260: generic USART implementation for SAM9 SoCs - at91sam9260: generic USART implementation for SAM9 SoCs
Example: Example:
- use PDC:
usart0: serial@fff8c000 { usart0: serial@fff8c000 {
compatible = "atmel,at91sam9260-usart"; compatible = "atmel,at91sam9260-usart";
reg = <0xfff8c000 0x4000>; reg = <0xfff8c000 0x4000>;
@ -25,3 +30,14 @@ Example:
atmel,use-dma-tx; 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";
};