dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/arm/cpu-enable-method/al,alpine-smp

@@ -0,0 +1,80 @@
+========================================================
+Secondary CPU enable-method "al,alpine-smp" binding
+========================================================
+
+This document describes the "al,alpine-smp" method for
+enabling secondary CPUs. To apply to all CPUs, a single
+"al,alpine-smp" enable method should be defined in the
+"cpus" node.
+
+Enable method name:	"al,alpine-smp"
+Compatible machines:	"al,alpine"
+Compatible CPUs:	"arm,cortex-a15"
+Related properties:	(none)
+
+Note:
+This enable method requires valid nodes compatible with
+"al,alpine-cpu-resume" and "al,alpine-nb-service".
+
+
+* Alpine CPU resume registers
+
+The CPU resume register are used to define required resume address after
+reset.
+
+Properties:
+- compatible : Should contain "al,alpine-cpu-resume".
+- reg : Offset and length of the register set for the device
+
+
+* Alpine System-Fabric Service Registers
+
+The System-Fabric Service Registers allow various operation on CPU and
+system fabric, like powering CPUs off.
+
+Properties:
+- compatible : Should contain "al,alpine-sysfabric-service" and "syscon".
+- reg : Offset and length of the register set for the device
+
+
+Example:
+
+cpus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	enable-method = "al,alpine-smp";
+
+	cpu@0 {
+		compatible = "arm,cortex-a15";
+		device_type = "cpu";
+		reg = <0>;
+	};
+
+	cpu@1 {
+		compatible = "arm,cortex-a15";
+		device_type = "cpu";
+		reg = <1>;
+	};
+
+	cpu@2 {
+		compatible = "arm,cortex-a15";
+		device_type = "cpu";
+		reg = <2>;
+	};
+
+	cpu@3 {
+		compatible = "arm,cortex-a15";
+		device_type = "cpu";
+		reg = <3>;
+	};
+};
+
+cpu_resume {
+	compatible = "al,alpine-cpu-resume";
+	reg = <0xfbff5ed0 0x30>;
+};
+
+nb_service {
+        compatible = "al,alpine-sysfabric-service", "syscon";
+        reg = <0xfb070000 0x10000>;
+};