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, 41 insertions, 0 deletions

diff --git a/kernel/Documentation/devicetree/bindings/spi/efm32-spi.txt b/kernel/Documentation/devicetree/bindings/spi/efm32-spi.txt
new file mode 100644
index 000000000..750e29aff
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/spi/efm32-spi.txt
@@ -0,0 +1,41 @@
+* Energy Micro EFM32 SPI
+
+Required properties:
+- #address-cells: see spi-bus.txt
+- #size-cells: see spi-bus.txt
+- compatible: should be "energymicro,efm32-spi"
+- reg: Offset and length of the register set for the controller
+- interrupts: pair specifying rx and tx irq
+- clocks: phandle to the spi clock
+- cs-gpios: see spi-bus.txt
+
+Recommended properties :
+- energymicro,location: Value to write to the ROUTE register's LOCATION
+                        bitfield to configure the pinmux for the device, see
+                        datasheet for values.
+                        If this property is not provided, keeping what is
+                        already configured in the hardware, so its either the
+                        reset default 0 or whatever the bootloader did.
+
+Example:
+
+spi1: spi@0x4000c400 { /* USART1 */
+	#address-cells = <1>;
+	#size-cells = <0>;
+	compatible = "energymicro,efm32-spi";
+	reg = <0x4000c400 0x400>;
+	interrupts = <15 16>;
+	clocks = <&cmu 20>;
+	cs-gpios = <&gpio 51 1>; // D3
+	energymicro,location = <1>;
+	status = "ok";
+
+	ks8851@0 {
+		compatible = "ks8851";
+		spi-max-frequency = <6000000>;
+		reg = <0>;
+		interrupt-parent = <&boardfpga>;
+		interrupts = <4>;
+		status = "ok";
+	};
+};