Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / cpufreq / cpufreq-spear.txt

diff --git a/kernel/Documentation/devicetree/bindings/cpufreq/cpufreq-spear.txt b/kernel/Documentation/devicetree/bindings/cpufreq/cpufreq-spear.txt
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+SPEAr cpufreq driver
+-------------------
+
+SPEAr SoC cpufreq driver for CPU frequency scaling.
+It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) systems
+which share clock across all CPUs.
+
+Required properties:
+- cpufreq_tbl: Table of frequencies CPU could be transitioned into, in the
+  increasing order.
+
+Optional properties:
+- clock-latency: Specify the possible maximum transition latency for clock, in
+  unit of nanoseconds.
+
+Both required and optional properties listed above must be defined under node
+/cpus/cpu@0.
+
+Examples:
+--------
+cpus {
+
+       <...>
+
+       cpu@0 {
+               compatible = "arm,cortex-a9";
+               reg = <0>;
+
+               <...>
+
+               cpufreq_tbl = < 166000
+                               200000
+                               250000
+                               300000
+                               400000
+                               500000
+                               600000 >;
+       };
+
+       <...>
+
+};