[PATCH V2 2/2] PM / OPP: Introduce domain-performance-state binding to OPP nodes

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




Some platforms have the capability to configure the performance state of
their Power Domains. The performance levels are represented by positive
integer values, a lower value represents lower performance state.

If the consumers don't need the capability of switching to different
domain performance states at runtime, then they can simply define their
required domain performance state in their nodes directly.

But if the device needs the capability of switching to different domain
performance states, as they may need to support different clock rates,
then the per OPP node can be used to contain that information.

This patch introduces the domain-performance-state (already defined by
Power Domain bindings) to the per OPP node.

Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
 Documentation/devicetree/bindings/opp/opp.txt | 59 +++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
index 9f5ca4457b5f..43eba7c9fc58 100644
--- a/Documentation/devicetree/bindings/opp/opp.txt
+++ b/Documentation/devicetree/bindings/opp/opp.txt
@@ -154,6 +154,9 @@ properties.
 
 - status: Marks the node enabled/disabled.
 
+- domain-performance-state: A phandle of a Performance state node as defined by
+  ../power/power_domain.txt binding document.
+
 Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together.
 
 / {
@@ -528,3 +531,59 @@ Example 5: opp-supported-hw
 		};
 	};
 };
+
+Example 7: domain-Performance-state:
+(example: For 1GHz require domain state 1 and for 1.1 & 1.2 GHz require state 2)
+
+/ {
+	foo_domain: power-controller@12340000 {
+		compatible = "foo,power-controller";
+		reg = <0x12340000 0x1000>;
+		#power-domain-cells = <0>;
+		domain-performance-states = <&domain_perf_states>;
+	};
+
+	domain_perf_states: performance_states {
+		compatible = "domain-performance-state";
+		domain_perf_state1: pstate@1 {
+			performance-level = <1>;
+			domain-microvolt = <970000 975000 985000>;
+		};
+		domain_perf_state2: pstate@2 {
+			performance-level = <2>;
+			domain-microvolt = <1000000 1075000 1085000>;
+		};
+	}
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			compatible = "arm,cortex-a9";
+			reg = <0>;
+			clocks = <&clk_controller 0>;
+			clock-names = "cpu";
+			operating-points-v2 = <&cpu0_opp_table>;
+			power-domains = <&foo_domain>;
+		};
+	};
+
+	cpu0_opp_table: opp_table0 {
+		compatible = "operating-points-v2";
+		opp-shared;
+
+		opp@1000000000 {
+			opp-hz = /bits/ 64 <1000000000>;
+			domain-performance-state = <&domain_perf_state1>;
+		};
+		opp@1100000000 {
+			opp-hz = /bits/ 64 <1100000000>;
+			domain-performance-state = <&domain_perf_state2>;
+		};
+		opp@1200000000 {
+			opp-hz = /bits/ 64 <1200000000>;
+			domain-performance-state = <&domain_perf_state2>;
+		};
+	};
+};
-- 
2.7.1.410.g6faf27b

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux