It's used for platforms where different OPPs may use different clocks.
With this extended binding, user could specify the correct clock for each
OPP node.
Cc: Viresh Kumar <vireshk@xxxxxxxxxx>
Cc: Nishanth Menon <nm@xxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Frank Rowand <frowand.list@xxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx>
---
Documentation/devicetree/bindings/opp/opp.txt | 52 +++++++++++++++++++++++++++
1 file changed, 52 insertions(+)
diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
index e36d261..40a4340 100644
--- a/Documentation/devicetree/bindings/opp/opp.txt
+++ b/Documentation/devicetree/bindings/opp/opp.txt
@@ -152,6 +152,11 @@ Optional properties:
hierarchy can be contained in multiple 32 bit values. i.e. <X Y Z1 Z2> in the
above example, Z1 & Z2 refer to the version hierarchy Z.
+- clocks: Clock phandle and specifier used for this opp.
+
+- clock-names: clock names for this opp. The valid clock names are platform
+ specific.
+
- status: Marks the node enabled/disabled.
Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together.
@@ -528,3 +533,50 @@ Example 6: opp-microvolt-<name>, opp-microamp-<name>:
};
};
};
+
+Example 7: Single core ARM cortex A7, switch separate clocks for each OPP:
+
+/ {
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ cpu@0 {
+ compatible = "arm,cortex-a7";
+ reg = <0>;
+ next-level-cache = <&L2>;
+ clocks = <&clk_controller 0>;
+ clock-names = "cpu";
+ cpu-supply = <&cpu_supply0>;
+ operating-points-v2 = <&cpu0_opp_table>;
+ };
+ };
+
+ cpu0_opp_table: opp_table0 {
+ compatible = "operating-points-v2";
+ opp-shared;
+
+ opp-1000000000 {
+ opp-hz = /bits/ 64 <1000000000>;
+ opp-microvolt = <975000 970000 985000>;
+ opp-microamp = <70000>;
+ clock-latency-ns = <300000>;
+ clocks = <&clk_controller 0>;
+ opp-suspend;
+ };
+ opp-1100000000 {
+ opp-hz = /bits/ 64 <1100000000>;
+ opp-microvolt = <1000000 980000 1010000>;
+ opp-microamp = <80000>;
+ clocks = <&clk_controller 1>;
+ clock-latency-ns = <310000>;
+ };
+ opp-1200000000 {
+ opp-hz = /bits/ 64 <1200000000>;
+ opp-microvolt = <1025000>;
+ clocks = <&clk_controller 2>;
+ clock-latency-ns = <290000>;
+ turbo-mode;
+ };
+ };
+};
--
2.7.4
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