| Message ID | 1458222449-12324-3-git-send-email-geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | RFC |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
On Thu, Mar 17, 2016 at 02:47:26PM +0100, Geert Uytterhoeven wrote: > 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. > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > Cc: devicetree@vger.kernel.org > --- > This has been mimicked after the "fsl,uart-has-rtscts" and > "sirf,uart-has-rtscts" properties. > > However, as this is fairly generic, perhaps it should just be named > "uart-has-rtscts" instead? Yes. And there are some other variations of properties to enable flow-control. > --- > Documentation/devicetree/bindings/serial/renesas,sci-serial.txt | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt > index f8d7b36742967163..8de177c187536c68 100644 > --- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt > +++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt > @@ -79,6 +79,11 @@ Optional properties: > - {cts,dsr,dcd,rng,rts,dtr,out1,out2}-gpios: Must contain a GPIO specifier, > referring to the GPIO pin to be used as the UART's CTS, DSR, DCD, RNG, RTS, > DTR, OUT1, or OUT2 line. > + - renesas,uart-has-rtscts: The presence of this property indicates that the > + UART has dedicated lines for RTS/CTS hardware flow control, and that > + they are available for use (wired and enabled by pinmux configuration). > + Note that this property is mutually-exclusive with "cts-gpios" and > + "rts-gpios" above. > > Example: > aliases { > -- > 1.9.1 > > -- > To unsubscribe from this list: send the line "unsubscribe devicetree" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt index f8d7b36742967163..8de177c187536c68 100644 --- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt +++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt @@ -79,6 +79,11 @@ Optional properties: - {cts,dsr,dcd,rng,rts,dtr,out1,out2}-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be used as the UART's CTS, DSR, DCD, RNG, RTS, DTR, OUT1, or OUT2 line. + - renesas,uart-has-rtscts: The presence of this property indicates that the + UART has dedicated lines for RTS/CTS hardware flow control, and that + they are available for use (wired and enabled by pinmux configuration). + Note that this property is mutually-exclusive with "cts-gpios" and + "rts-gpios" above. Example: aliases {
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. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Cc: devicetree@vger.kernel.org --- This has been mimicked after the "fsl,uart-has-rtscts" and "sirf,uart-has-rtscts" properties. However, as this is fairly generic, perhaps it should just be named "uart-has-rtscts" instead? --- Documentation/devicetree/bindings/serial/renesas,sci-serial.txt | 5 +++++ 1 file changed, 5 insertions(+)