[PATCH] tty: of_serial: add no-loopback-test property

The loopback test mode is not implemented in all
NS16550 compatible UARTs. The 8250 driver uses the
UPF_SKIP_TEST flag to indicate this, however it is
not possible to set this flag via device-tree.

Add a new 'no-loopback-test' property, and modify
the of_serial driver to set the UPF_SKIP_TEST flag
if the property is present.

Signed-off-by: Gabor Juhos <redacted>
---
 .../devicetree/bindings/tty/serial/of-serial.txt   |    2 ++
 drivers/tty/serial/of_serial.c                     |    4 ++++
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/Documentation/devicetree/bindings/tty/serial/of-serial.txt b/Documentation/devicetree/bindings/tty/serial/of-serial.txt
index b8b27b0..0e83e45 100644
--- a/Documentation/devicetree/bindings/tty/serial/of-serial.txt
+++ b/Documentation/devicetree/bindings/tty/serial/of-serial.txt

@@ -24,6 +24,8 @@ Optional properties:
   accesses to the UART (e.g. TI davinci).
 - used-by-rtas : set to indicate that the port is in use by the OpenFirmware
   RTAS and should not be registered.
+- no-loopback-test: set to indicate that the port does not implements loopback
+  test mode
 
 Example:
 

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 5410c06..301e5e3 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c

@@ -105,6 +105,10 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
 	port->uartclk = clk;
 	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
 		| UPF_FIXED_PORT | UPF_FIXED_TYPE;
+
+	if (of_find_property(np, "no-loopback-test", NULL))
+		port->flags |= UPF_SKIP_TEST;
+
 	port->dev = &ofdev->dev;
 
 	if (type == PORT_TEGRA)

-- 
1.7.2.1

On Sat, 14 Jul 2012 14:06:20 +0200
Gabor Juhos [off-list ref] wrote:

The loopback test mode is not implemented in all
NS16550 compatible UARTs. The 8250 driver uses the
UPF_SKIP_TEST flag to indicate this, however it is
not possible to set this flag via device-tree.

Add a new 'no-loopback-test' property, and modify
the of_serial driver to set the UPF_SKIP_TEST flag
if the property is present.

Signed-off-by: Gabor Juhos <redacted>

Looks good to me but clashes with the sync of the termios changes, which
we urgently need to get in first.

Greg - I'll add this to my patch stack with the relevant changes so that
it doesn't get messed up.

Alan

On Sat, Jul 14, 2012 at 03:01:01PM +0100, Alan Cox wrote:

On Sat, 14 Jul 2012 14:06:20 +0200
Gabor Juhos [off-list ref] wrote:

quoted

The loopback test mode is not implemented in all
NS16550 compatible UARTs. The 8250 driver uses the
UPF_SKIP_TEST flag to indicate this, however it is
not possible to set this flag via device-tree.

Add a new 'no-loopback-test' property, and modify
the of_serial driver to set the UPF_SKIP_TEST flag
if the property is present.

Signed-off-by: Gabor Juhos <redacted>

Looks good to me but clashes with the sync of the termios changes, which
we urgently need to get in first.

Greg - I'll add this to my patch stack with the relevant changes so that
it doesn't get messed up.

Ok, thanks for doing that.

greg k-h

2012.07.14. 16:01 keltezéssel, Alan Cox írta:

On Sat, 14 Jul 2012 14:06:20 +0200
Gabor Juhos [off-list ref] wrote:

quoted

The loopback test mode is not implemented in all
NS16550 compatible UARTs. The 8250 driver uses the
UPF_SKIP_TEST flag to indicate this, however it is
not possible to set this flag via device-tree.

Add a new 'no-loopback-test' property, and modify
the of_serial driver to set the UPF_SKIP_TEST flag
if the property is present.

Signed-off-by: Gabor Juhos <redacted>

Looks good to me but clashes with the sync of the termios changes, which
we urgently need to get in first.

Greg - I'll add this to my patch stack with the relevant changes so that
it doesn't get messed up.

Thank you!

-Gabor
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