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, 46 insertions, 0 deletions

diff --git a/kernel/Documentation/devicetree/bindings/sound/cs42l52.txt b/kernel/Documentation/devicetree/bindings/sound/cs42l52.txt
new file mode 100644
index 000000000..bc03c9312
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/sound/cs42l52.txt
@@ -0,0 +1,46 @@
+CS42L52 audio CODEC
+
+Required properties:
+
+  - compatible : "cirrus,cs42l52"
+
+  - reg : the I2C address of the device for I2C
+
+Optional properties:
+
+  - cirrus,reset-gpio : GPIO controller's phandle and the number
+  of the GPIO used to reset the codec.
+
+  - cirrus,chgfreq-divisor : Values used to set the Charge Pump Frequency.
+  Allowable values of 0x00 through 0x0F. These are raw values written to the
+  register, not the actual frequency. The frequency is determined by the following.
+  Frequency = (64xFs)/(N+2)
+  N = chgfreq_val
+  Fs = Sample Rate (variable)
+
+  - cirrus,mica-differential-cfg : boolean, If present, then the MICA input is configured
+  as a differential input. If not present then the MICA input is configured as
+  Single-ended input. Single-ended mode allows for MIC1 or MIC2 muxing for input.
+
+  - cirrus,micb-differential-cfg : boolean, If present, then the MICB input is configured
+  as a differential input. If not present then the MICB input is configured as
+  Single-ended input. Single-ended mode allows for MIC1 or MIC2 muxing for input.
+
+  - cirrus,micbias-lvl: Set the output voltage level on the MICBIAS Pin
+  0 = 0.5 x VA
+  1 = 0.6 x VA
+  2 = 0.7 x VA
+  3 = 0.8 x VA
+  4 = 0.83 x VA
+  5 = 0.91 x VA
+
+Example:
+
+codec: codec@4a {
+	compatible = "cirrus,cs42l52";
+	reg = <0x4a>;
+	reset-gpio = <&gpio 10 0>;
+	cirrus,chgfreq-divisor = <0x05>;
+	cirrus.mica-differential-cfg;
+	cirrus,micbias-lvl = <5>;
+};