linux-kernel - [PATCH 3/3] serial: of_serial: Handle hw-flow-control property

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Date:	Mon, 25 Mar 2013 13:34:46 +0200
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Ley Foon Tan <lftan@...era.com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: [PATCH 3/3] serial: of_serial: Handle hw-flow-control property

This will add support for hardware flow control. It is
limited to be used only with 8250 driver.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 .../devicetree/bindings/tty/serial/of-serial.txt          |    1 +
 drivers/tty/serial/of_serial.c                            |   13 ++++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/tty/serial/of-serial.txt b/Documentation/devicetree/bindings/tty/serial/of-serial.txt
index c13f0ce..e775c93 100644
--- a/Documentation/devicetree/bindings/tty/serial/of-serial.txt
+++ b/Documentation/devicetree/bindings/tty/serial/of-serial.txt
@@ -34,6 +34,7 @@ Optional properties:
 - no-loopback-test: set to indicate that the port does not implements loopback
   test mode
 - fifo-size: the fifo size of the UART.
+- hw-flow-control: support for hardware flow control
 
 Example:
 
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 267711b..2933112 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -14,7 +14,6 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/serial_core.h>
-#include <linux/serial_8250.h>
 #include <linux/serial_reg.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -22,6 +21,8 @@
 #include <linux/nwpserial.h>
 #include <linux/clk.h>
 
+#include "8250/8250.h"
+
 struct of_serial_info {
 	struct clk *clk;
 	int type;
@@ -171,11 +172,17 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 #ifdef CONFIG_SERIAL_8250
 	case PORT_8250 ... PORT_MAX_8250:
 	{
-		/* For now the of bindings don't support the extra
-		   8250 specific bits */
 		struct uart_8250_port port8250;
 		memset(&port8250, 0, sizeof(port8250));
 		port8250.port = port;
+
+		if (port.fifosize)
+			port8250.capabilities = UART_CAP_FIFO;
+
+		if (of_property_read_bool(ofdev->dev.of_node,
+					  "hw-flow-control"))
+			port8250.capabilities |= UART_CAP_AFE;
+
 		ret = serial8250_register_8250_port(&port8250);
 		break;
 	}
-- 
1.7.10.4

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