Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/kernel/Documentation/devicetree/bindings/sound/cs4271.txt b/kernel/Documentation/devicetree/bindings/sound/cs4271.txt
new file mode 100644
index 000000000..e2cd1d753
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/sound/cs4271.txt
@@ -0,0 +1,50 @@
+Cirrus Logic CS4271 DT bindings
+
+This driver supports both the I2C and the SPI bus.
+
+Required properties:
+
+ - compatible: "cirrus,cs4271"
+
+For required properties on SPI, please consult
+Documentation/devicetree/bindings/spi/spi-bus.txt
+
+Required properties on I2C:
+
+ - reg: the i2c address
+
+
+Optional properties:
+
+ - reset-gpio: 	a GPIO spec to define which pin is connected to the chip's
+		!RESET pin
+ - cirrus,amuteb-eq-bmutec:	When given, the Codec's AMUTEB=BMUTEC flag
+				is enabled.
+ - cirrus,enable-soft-reset:
+	The CS4271 requires its LRCLK and MCLK to be stable before its RESET
+	line is de-asserted. That also means that clocks cannot be changed
+	without putting the chip back into hardware reset, which also requires
+	a complete re-initialization of all registers.
+
+	One (undocumented) workaround is to assert and de-assert the PDN bit
+	in the MODE2 register. This workaround can be enabled with this DT
+	property.
+
+	Note that this is not needed in case the clocks are stable
+	throughout the entire runtime of the codec.
+
+Examples:
+
+	codec_i2c: cs4271@10 {
+		compatible = "cirrus,cs4271";
+		reg = <0x10>;
+		reset-gpio = <&gpio 23 0>;
+	};
+
+	codec_spi: cs4271@0 {
+		compatible = "cirrus,cs4271";
+		reg = <0x0>;
+		reset-gpio = <&gpio 23 0>;
+		spi-max-frequency = <6000000>;
+	};
+