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serial: sh-sci: Update DT binding documentation for dedicated RTS/CTS

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Some Renesas SCIF UARTs have dedicated lines for RTS/CTS hardware flow
control.  Whether these lines exist depends on SoC and UART instance
inside the SoC.  Whether these lines can be used for hardware flow
control depends on board wiring.

Amend the DT bindings with an optional property to indicate that RTS/CTS
hardware flow control lines exist, and can be used as such, according to
the Generic Serial DT Bindings.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2016-06-03 12:00:02 +02:00 committed by Greg Kroah-Hartman
parent 0c529b3fc6
commit b0405dc998
1 changed files with 2 additions and 0 deletions
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Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
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@ -78,6 +78,8 @@ Optional properties:
- dma-names: Must contain a list of two DMA names, "tx" and "rx".
- {cts,dsr,dcd,rng,rts,dtr}-gpios: Specify GPIOs for modem lines, cfr. the
generic serial DT bindings in serial.txt.
- uart-has-rtscts: Indicates dedicated lines for RTS/CTS hardware flow
control, cfr. the generic serial DT bindings in serial.txt.
Example:
aliases {