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, 22 insertions, 0 deletions

diff --git a/kernel/Documentation/devicetree/bindings/gpio/gpio-74x164.txt b/kernel/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
new file mode 100644
index 000000000..cc2608021
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
@@ -0,0 +1,22 @@
+* Generic 8-bits shift register GPIO driver
+
+Required properties:
+- compatible : Should be "fairchild,74hc595"
+- reg : chip select number
+- gpio-controller : Marks the device node as a gpio controller.
+- #gpio-cells : Should be two.  The first cell is the pin number and
+  the second cell is used to specify the gpio polarity:
+      0 = active high
+      1 = active low
+- registers-number: Number of daisy-chained shift registers
+
+Example:
+
+gpio5: gpio5@0 {
+	compatible = "fairchild,74hc595";
+	reg = <0>;
+	gpio-controller;
+	#gpio-cells = <2>;
+	registers-number = <4>;
+	spi-max-frequency = <100000>;
+};