add 3 new properties: - "atmel,fifo-size": to enable FIFO support - "atmel,rts-low-threshold" and "atmel,rts-high-threshold": to control the hardware handshake flow control. Signed-off-by: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxx> --- Documentation/devicetree/bindings/serial/atmel-usart.txt | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/devicetree/bindings/serial/atmel-usart.txt b/Documentation/devicetree/bindings/serial/atmel-usart.txt index 90787aa..6158418 100644 --- a/Documentation/devicetree/bindings/serial/atmel-usart.txt +++ b/Documentation/devicetree/bindings/serial/atmel-usart.txt @@ -22,6 +22,21 @@ Optional properties: 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: size of the TX and RX FIFOs. That is to say the maximum + number of data each FIFO can store. A positive size enables FIFO support. + A zero size or a missing property disables FIFO support. +- atmel,rts-low-threshold: when the RX FIFO level, ie the number of data + available to be read from the RX FIFO, crosses down this threshold the RTS + line is driven to low level to tell the remote peer that it can (re)start + sending new data. +- atmel,rts-high-threshold: when the RX FIFO level crosses up this threshold, + the RTS line is driven to high level to tell the remote peer that it should + stop sending new data. + +0 < rts-low-threshold < rts-high-threshold <= fifo-size + +These two thresholds are only used when both the FIFO support and the hardware +handshake mode are enabled. <chip> compatible description: - at91rm9200: legacy USART support -- 1.8.2.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
