ARM: dts: Alpine platform binding documentation

This patch introduces documentation for alpine devicetree bindings.

Signed-off-by: Barak Wasserstrom <barak@annapurnalabs.com>
Signed-off-by: Tsahee Zidenberg <tsahee@annapurnalabs.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 141 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/al,alpine.txt b/Documentation/devicetree/bindings/arm/al,alpine.txt
new file mode 100644
index 000000000000..f404a4f9b165
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/al,alpine.txt
@@ -0,0 +1,88 @@
+Annapurna Labs Alpine Platform Device Tree Bindings
+---------------------------------------------------------------
+
+Boards in the Alpine family shall have the following properties:
+
+* Required root node properties:
+compatible: must contain "al,alpine"
+
+* Example:
+
+/ {
+        model = "Annapurna Labs Alpine Dev Board";
+        compatible = "al,alpine";
+
+        ...
+}
+
+* CPU node:
+
+The Alpine platform includes cortex-a15 cores.
+enable-method: must be "al,alpine-smp" to allow smp  [1]
+
+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>;
+        };
+};
+
+
+* 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
+
+Example:
+
+cpu_resume {
+        compatible = "al,alpine-cpu-resume";
+        reg = <0xfbff5ed0 0x30>;
+};
+
+* 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:
+
+nb_service {
+        compatible = "al,alpine-sysfabric-service", "syscon";
+        reg = <0xfb070000 0x10000>;
+};
+
+[1] arm/cpu-enable-method/al,alpine-smp
diff --git a/Documentation/devicetree/bindings/arm/cpu-enable-method/al,alpine-smp b/Documentation/devicetree/bindings/arm/cpu-enable-method/al,alpine-smp
new file mode 100644
index 000000000000..c2e0cc5e4cfd
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/cpu-enable-method/al,alpine-smp
@@ -0,0 +1,52 @@
+========================================================
+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"[1].
+
+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>;
+        };
+};
+
+--
+[1] arm/al,alpine.txt
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index aeb5bb5b7791..0c5d6bbafd69 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -11,6 +11,7 @@ adapteva	Adapteva, Inc.
 adh     AD Holdings Plc.
 adi     Analog Devices, Inc.
 aeroflexgaisler Aeroflex Gaisler AB
+al      Annapurna Labs
 allwinner       Allwinner Technology Co., Ltd.
 alphascale      AlphaScale Integrated Circuits Systems, Inc.
 altr    Altera Corp.