summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/cpufreq/cpufreq-spear.txt
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--Documentation/devicetree/bindings/cpufreq/cpufreq-spear.txt42
1 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-spear.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-spear.txt
new file mode 100644
index 000000000..f3d44984d
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-spear.txt
@@ -0,0 +1,42 @@
+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 >;
+ };
+
+ <...>
+
+};