Commit e4697193 authored by Elen Song's avatar Elen Song Committed by Greg Kroah-Hartman
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serial: at91: add dma support in usart binding descriptions 



Signed-off-by: default avatarElen Song <elen.song@atmel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2e68c22f

Documentation/devicetree/bindings/tty/serial/atmel-usart.txt

+17 −1
Original line number Diff line number Diff line
@@ -10,13 +10,18 @@ Required properties: 
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>;
@@ -25,3 +30,14 @@ Example: 
		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";

	};