[PATCH 4/5] dt-bindings: csky: Add csky PMU bindings

Mao Han
2019-05-22T09:26:59Z

This patch adds the documentation to describe that how to add pmu node in
dts.

Signed-off-by: Mao Han <han_mao@c-sky.com>
CC: Rob Herring <robh+dt@kernel.org>
CC: Guo Ren <guoren@kernel.org>
CC: linux-csky@vger.kernel.org
---
Documentation/devicetree/bindings/csky/pmu.txt | 38 ++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 Documentation/devicetree/bindings/csky/pmu.txt

diff --git a/Documentation/devicetree/bindings/csky/pmu.txt b/Documentation/devicetree/bindings/csky/pmu.txt
new file mode 100644
index 0000000..6d3cba3
--- /dev/null
+++ b/Documentation/devicetree/bindings/csky/pmu.txt
@@ -0,0 +1,38 @@
+============================
+C-SKY Performance Monitor Units
+============================
+
+C-SKY 8xx series cores often have a PMU for counting cpu and cache events.
+The C-SKY PMU representation in the device tree should be done as under:
+
+==============================
+PMU node bindings definition
+==============================
+
+ Description: Describes PMU
+
+ PROPERTIES
+
+ - compatible
+ Usage: required
+ Value type: <string>
+ Definition: must be "csky,csky-pmu"
+ - interrupts
+ Usage: required
+ Value type: <u32>
+ Definition: must be pmu irq num defined by soc
+ - reg-io-width
+ Usage: optional
+ Value type: <u32>
+ Definition: the width of pmu counter
+
+Examples:
+---------
+
+ pmu {
+ compatible = "csky,csky-pmu";
+ interrupts = <0x17>;
+ interrupt-parent = <&intc>;
+ reg-io-width = <0x30>;
+ };
+
--
2.7.4