linux-kernel - [PATCH 4/4] tty: omap-serial: support setting of hardware flow control in dts

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Date:	Tue, 19 Aug 2014 14:14:48 +0200
From:	Frans Klaver <frans.klaver@...ns.com>
To:	Felipe Balbi <balbi@...com>
CC:	Frans Klaver <frans.klaver@...ns.com>,
	Tony Lindgren <tony@...mide.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexey Pelykh <alexey.pelykh@...il.com>,
	Jiri Slaby <jslaby@...e.cz>,
	Frans Klaver <fransklaver@...il.com>,
	<linux-serial@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 4/4] tty: omap-serial: support setting of hardware flow control in dts

This makes hardware flow control availability configurable from the
device tree.

Signed-off-by: Frans Klaver <frans.klaver@...ns.com>
---
 Documentation/devicetree/bindings/serial/omap_serial.txt | 1 +
 drivers/tty/serial/omap-serial.c                         | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/omap_serial.txt b/Documentation/devicetree/bindings/serial/omap_serial.txt
index 342eedd..1b629e9 100644
--- a/Documentation/devicetree/bindings/serial/omap_serial.txt
+++ b/Documentation/devicetree/bindings/serial/omap_serial.txt
@@ -8,3 +8,4 @@ Required properties:
 
 Optional properties:
 - clock-frequency : frequency of the clock input to the UART
+- has-hw-flow-control : the hardware has flow control capability
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 57664b9..7d3b3d2 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1598,6 +1598,10 @@ static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
 
 	of_property_read_u32(dev->of_node, "clock-frequency",
 					 &omap_up_info->uartclk);
+
+	if (of_property_read_bool(dev->of_node, "has-hw-flow-control"))
+		omap_up_info->flags |= UPF_HARD_FLOW;
+
 	return omap_up_info;
 }
 
-- 
1.9.3

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