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, 58 insertions, 0 deletions

diff --git a/kernel/Documentation/devicetree/bindings/pwm/pwm-lp3943.txt b/kernel/Documentation/devicetree/bindings/pwm/pwm-lp3943.txt
new file mode 100644
index 000000000..7bd9d3b12
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/pwm/pwm-lp3943.txt
@@ -0,0 +1,58 @@
+TI/National Semiconductor LP3943 PWM controller
+
+Required properties:
+  - compatible: "ti,lp3943-pwm"
+  - #pwm-cells: Should be 2. See pwm.txt in this directory for a
+                description of the cells format.
+                Note that this hardware limits the period length to the
+                range 6250~1600000.
+  - ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1.
+    0 = output 0
+    1 = output 1
+    .
+    .
+    15 = output 15
+
+Example:
+PWM 0 is for RGB LED brightness control
+PWM 1 is for brightness control of LP8557 backlight device
+
+&i2c3 {
+	lp3943@60 {
+		compatible = "ti,lp3943";
+		reg = <0x60>;
+
+		/*
+		 * PWM 0 : output 8, 9 and 10
+		 * PWM 1 : output 15
+		 */
+		pwm3943: pwm {
+			compatible = "ti,lp3943-pwm";
+			#pwm-cells = <2>;
+			ti,pwm0 = <8 9 10>;
+			ti,pwm1 = <15>;
+		};
+	};
+
+};
+
+/* LEDs control with PWM 0 of LP3943 */
+pwmleds {
+	compatible = "pwm-leds";
+	rgb {
+		label = "indi::rgb";
+		pwms = <&pwm3943 0 10000>;
+		max-brightness = <255>;
+	};
+};
+
+&i2c4 {
+	/* Backlight control with PWM 1 of LP3943 */
+	backlight@2c {
+		compatible = "ti,lp8557";
+		reg = <0x2c>;
+
+		pwms = <&pwm3943 1 10000>;
+		pwm-names = "lp8557";
+	};
+};