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[v3,2/2] ARC: Add documentation on DT binding for ARC700 PMU

Message ID 1383832512-21130-3-git-send-email-mjonker@synopsys.com
State Accepted, archived
Commit d6a7f73db712a11b1c30b2566758de65b308da73
Headers show

Commit Message

Mischa Jonker Nov. 7, 2013, 1:55 p.m. UTC 
Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
---
 Documentation/devicetree/bindings/arc/pmu.txt |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arc/pmu.txt
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Patch

diff --git a/Documentation/devicetree/bindings/arc/pmu.txt b/Documentation/devicetree/bindings/arc/pmu.txt
new file mode 100644
index 0000000..49d5173
--- /dev/null
+++ b/Documentation/devicetree/bindings/arc/pmu.txt
@@ -0,0 +1,24 @@ 
+* ARC Performance Monitor Unit
+
+The ARC 700 can be configured with a pipeline performance monitor for counting
+CPU and cache events like cache misses and hits.
+
+Note that:
+ * ARC 700 refers to a family of ARC processor cores;
+   - There is only one type of PMU available for the whole family;
+   - The PMU may support different sets of events; supported events are probed
+     at boot time, as required by the reference manual.
+
+ * The ARC 700 PMU does not support interrupts; although HW events may be
+   counted, the HW events themselves cannot serve as a trigger for a sample.
+
+Required properties:
+
+- compatible : should contain
+	"snps,arc700-pmu"
+
+Example:
+
+pmu {
+        compatible = "snps,arc700-pmu";
+};