[PATCH 0/3] ARM/arm64: dts: renesas: Describe RTS/CTS hardware flow control

[PATCH 0/3] ARM/arm64: dts: renesas: Describe RTS/CTS hardware flow control

[Geert Uytterhoeven]

	Hi Simon, Magnus,

This patch series updates the various Renesas DTSes to describe that
some UARTS have dedicated lines for RTS/CTS hardware flow control, and
that they are available for use (wired and enabled by pinmux
configuration), by adding the "uart-has-rtscts" property to
board-specific DTS files where appropriate.

While the actual DT binding updates documenting the "uart-has-rtscts"
property for SCIF(A) UARTs ("serial: sh-sci: Update DT binding
documentation for dedicated RTS/CTS") hasn't been accepted into tty-next
yet, this property is part of the Generic Serial DT Bindings
(Documentation/devicetree/bindings/serial/serial.txt), which has been
accepted.

Actual enablement of RTS/CTS hardware flow control (through setting the
CRTSCTS termios flag from userspace) depends on series "[PATCH v2 00/11]
serial: sh-sci: Hardware Flow Control Updates"
(http://www.spinics.net/lists/linux-serial/msg22535.html).
Note that setting the CRTSCTS flag for a serial port that is being used
as the kernel console is a bad idea ;-) You'll have better luck with
UARTs on expansion connectors, cfr. the topic/renesas-overlays branch of
https://git.kernel.org/cgit/linux/kernel/git/geert/renesas-drivers.git

Thanks!

Geert Uytterhoeven (3):
  ARM: dts: bockw: SCIF0 supports RTS/CTS hardware flow control
  ARM: dts: kzm9g: SCIFA4 supports RTS/CTS hardware flow control
  arm64: dts: salvator-x: SCIF1 supports RTS/CTS hardware flow control

 arch/arm/boot/dts/r8a7778-bockw.dts                | 1 +
 arch/arm/boot/dts/sh73a0-kzm9g.dts                 | 1 +
 arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts | 1 +
 3 files changed, 3 insertions(+)

-- 
1.9.1

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

[PATCH 1/3] ARM: dts: bockw: SCIF0 supports RTS/CTS hardware flow control

[Geert Uytterhoeven]

On the BOCK-W development board, the RTS and CTS pins of the console
SCIF0 are wired to the "product serial" connector.  Reflect this in the
DTS by adding the "uart-has-rtscts" property to the scif0 device node.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 arch/arm/boot/dts/r8a7778-bockw.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/r8a7778-bockw.dts b/arch/arm/boot/dts/r8a7778-bockw.dts
index e0dab14646488c6b..982a237ea6222a59 100644
--- a/arch/arm/boot/dts/r8a7778-bockw.dts
+++ b/arch/arm/boot/dts/r8a7778-bockw.dts
@@ -223,6 +223,7 @@
 	pinctrl-0 = <&scif0_pins>;
 	pinctrl-names = "default";
 
+	uart-has-rtscts;
 	status = "okay";
 };
 
-- 
1.9.1

[PATCH 2/3] ARM: dts: kzm9g: SCIFA4 supports RTS/CTS hardware flow control

[Geert Uytterhoeven]

On the KZM-A9-GT development board, the RTS and CTS pins of the debug
console SCIFA4 are wired to the CP2102 Serial-USB bridge.  Reflect
this in the DTS by adding the "uart-has-rtscts" property to the scifa4
device node.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 arch/arm/boot/dts/sh73a0-kzm9g.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/sh73a0-kzm9g.dts b/arch/arm/boot/dts/sh73a0-kzm9g.dts
index e6b2ef3785c7542a..b393b1f5bee24574 100644
--- a/arch/arm/boot/dts/sh73a0-kzm9g.dts
+++ b/arch/arm/boot/dts/sh73a0-kzm9g.dts
@@ -378,6 +378,7 @@
 	pinctrl-0 = <&scifa4_pins>;
 	pinctrl-names = "default";
 
+	uart-has-rtscts;
 	status = "okay";
 };
 
-- 
1.9.1

[PATCH 3/3] arm64: dts: salvator-x: SCIF1 supports RTS/CTS hardware flow control

[Geert Uytterhoeven]

On the Salvator-X development board, the RTS and CTS pins of debug
serial-1 port SCIF1 are wired to the CP2102 Serial-USB bridge.  Reflect
this in the DTS by adding the "uart-has-rtscts" property to the scif1
device node.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts b/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
index 5232aad07062198b..c09ead3a29fb72cf 100644
--- a/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
+++ b/arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts
@@ -369,6 +369,7 @@
 	pinctrl-0 = <&scif1_pins>;
 	pinctrl-names = "default";
 
+	uart-has-rtscts;
 	status = "okay";
 };
 
-- 
1.9.1

Re: [PATCH 0/3] ARM/arm64: dts: renesas: Describe RTS/CTS hardware flow control

[Simon Horman]

Hi Geert,

On Wed, May 04, 2016 at 10:57:55AM +0200, Geert Uytterhoeven wrote:
> 	Hi Simon, Magnus,
> 
> This patch series updates the various Renesas DTSes to describe that
> some UARTS have dedicated lines for RTS/CTS hardware flow control, and
> that they are available for use (wired and enabled by pinmux
> configuration), by adding the "uart-has-rtscts" property to
> board-specific DTS files where appropriate.
> 
> While the actual DT binding updates documenting the "uart-has-rtscts"
> property for SCIF(A) UARTs ("serial: sh-sci: Update DT binding
> documentation for dedicated RTS/CTS") hasn't been accepted into tty-next
> yet, this property is part of the Generic Serial DT Bindings
> (Documentation/devicetree/bindings/serial/serial.txt), which has been
> accepted.

On the basis of the binding being present in the generic documentation
I have queued up these patches. If that was not your intention please
let me know.

> Actual enablement of RTS/CTS hardware flow control (through setting the
> CRTSCTS termios flag from userspace) depends on series "[PATCH v2 00/11]
> serial: sh-sci: Hardware Flow Control Updates"
> (http://www.spinics.net/lists/linux-serial/msg22535.html).
> Note that setting the CRTSCTS flag for a serial port that is being used
> as the kernel console is a bad idea ;-) You'll have better luck with
> UARTs on expansion connectors, cfr. the topic/renesas-overlays branch of
> https://git.kernel.org/cgit/linux/kernel/git/geert/renesas-drivers.git
> 
> Thanks!
> 
> Geert Uytterhoeven (3):
>   ARM: dts: bockw: SCIF0 supports RTS/CTS hardware flow control
>   ARM: dts: kzm9g: SCIFA4 supports RTS/CTS hardware flow control
>   arm64: dts: salvator-x: SCIF1 supports RTS/CTS hardware flow control
> 
>  arch/arm/boot/dts/r8a7778-bockw.dts                | 1 +
>  arch/arm/boot/dts/sh73a0-kzm9g.dts                 | 1 +
>  arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts | 1 +
>  3 files changed, 3 insertions(+)
> 
> -- 
> 1.9.1
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
>