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, 25 insertions, 0 deletions

diff --git a/kernel/Documentation/devicetree/bindings/sound/ak4104.txt b/kernel/Documentation/devicetree/bindings/sound/ak4104.txt
new file mode 100644
index 000000000..deca5e18f
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/sound/ak4104.txt
@@ -0,0 +1,25 @@
+AK4104 S/PDIF transmitter
+
+This device supports SPI mode only.
+
+Required properties:
+
+  - compatible : "asahi-kasei,ak4104"
+
+  - reg : The chip select number on the SPI bus
+
+  - vdd-supply : A regulator node, providing 2.7V - 3.6V
+
+Optional properties:
+
+  - reset-gpio : a GPIO spec for the reset pin. If specified, it will be
+		 deasserted before communication to the device starts.
+
+Example:
+
+spdif: ak4104@0 {
+	compatible = "asahi-kasei,ak4104";
+	reg = <0>;
+	spi-max-frequency = <5000000>;
+	vdd-supply = <&vdd_3v3_reg>;
+};