[05/13] dt-bindings: cpufreq: qcom-nvmem: Support pstates provided by a power domain
diff mbox series

Message ID 20190705095726.21433-6-niklas.cassel@linaro.org
State Not Applicable, archived
Headers show
Series
  • Add support for QCOM Core Power Reduction
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Commit Message

Niklas Cassel July 5, 2019, 9:57 a.m. UTC
Some Qualcomm SoCs have support for Core Power Reduction (CPR).
On these platforms, we need to attach to the power domain provider
providing the performance states, so that the leaky device (the CPU)
can configure the performance states (which represent different
CPU clock frequencies).

Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
---
 .../bindings/opp/qcom-nvmem-cpufreq.txt       | 111 ++++++++++++++++++
 1 file changed, 111 insertions(+)

Comments

Rob Herring July 24, 2019, 3:26 p.m. UTC | #1
On Fri, Jul 05, 2019 at 11:57:16AM +0200, Niklas Cassel wrote:
> Some Qualcomm SoCs have support for Core Power Reduction (CPR).
> On these platforms, we need to attach to the power domain provider
> providing the performance states, so that the leaky device (the CPU)
> can configure the performance states (which represent different
> CPU clock frequencies).
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
> ---
>  .../bindings/opp/qcom-nvmem-cpufreq.txt       | 111 ++++++++++++++++++
>  1 file changed, 111 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt b/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
> index c5ea8b90e35d..e19a95318e98 100644
> --- a/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
> +++ b/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
> @@ -23,6 +23,15 @@ In 'operating-points-v2' table:
>  
>  Optional properties:
>  --------------------
> +In 'cpus' nodes:

In 'cpus' node or 'cpu' nodes?

> +- power-domains: A phandle pointing to the PM domain specifier which provides
> +		the performance states available for active state management.
> +		Please refer to the power-domains bindings
> +		Documentation/devicetree/bindings/power/power_domain.txt
> +		and also examples below.
> +- power-domain-names: Should be
> +	- 'cpr' for qcs404.
> +
>  In 'operating-points-v2' table:
>  - nvmem-cells: A phandle pointing to a nvmem-cells node representing the
>  		efuse registers that has information about the

Patch
diff mbox series

diff --git a/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt b/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
index c5ea8b90e35d..e19a95318e98 100644
--- a/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
+++ b/Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
@@ -23,6 +23,15 @@  In 'operating-points-v2' table:
 
 Optional properties:
 --------------------
+In 'cpus' nodes:
+- power-domains: A phandle pointing to the PM domain specifier which provides
+		the performance states available for active state management.
+		Please refer to the power-domains bindings
+		Documentation/devicetree/bindings/power/power_domain.txt
+		and also examples below.
+- power-domain-names: Should be
+	- 'cpr' for qcs404.
+
 In 'operating-points-v2' table:
 - nvmem-cells: A phandle pointing to a nvmem-cells node representing the
 		efuse registers that has information about the
@@ -682,3 +691,105 @@  soc {
 		};
 	};
 };
+
+Example 2:
+---------
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		CPU0: cpu@100 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53";
+			reg = <0x100>;
+			....
+			clocks = <&apcs_glb>;
+			operating-points-v2 = <&cpu_opp_table>;
+			power-domains = <&cprpd>;
+			power-domain-names = "cpr";
+		};
+
+		CPU1: cpu@101 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53";
+			reg = <0x101>;
+			....
+			clocks = <&apcs_glb>;
+			operating-points-v2 = <&cpu_opp_table>;
+			power-domains = <&cprpd>;
+			power-domain-names = "cpr";
+		};
+
+		CPU2: cpu@102 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53";
+			reg = <0x102>;
+			....
+			clocks = <&apcs_glb>;
+			operating-points-v2 = <&cpu_opp_table>;
+			power-domains = <&cprpd>;
+			power-domain-names = "cpr";
+		};
+
+		CPU3: cpu@103 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53";
+			reg = <0x103>;
+			....
+			clocks = <&apcs_glb>;
+			operating-points-v2 = <&cpu_opp_table>;
+			power-domains = <&cprpd>;
+			power-domain-names = "cpr";
+		};
+	};
+
+	cpu_opp_table: cpu-opp-table {
+		compatible = "operating-points-v2-kryo-cpu";
+		opp-shared;
+
+		opp-1094400000 {
+			opp-hz = /bits/ 64 <1094400000>;
+			required-opps = <&cpr_opp1>;
+		};
+		opp-1248000000 {
+			opp-hz = /bits/ 64 <1248000000>;
+			required-opps = <&cpr_opp2>;
+		};
+		opp-1401600000 {
+			opp-hz = /bits/ 64 <1401600000>;
+			required-opps = <&cpr_opp3>;
+		};
+	};
+
+	cpr_opp_table: cpr-opp-table {
+		compatible = "operating-points-v2-qcom-level";
+
+		cpr_opp1: opp1 {
+			opp-level = <1>;
+			....
+		};
+		cpr_opp2: opp2 {
+			opp-level = <2>;
+			....
+		};
+		cpr_opp3: opp3 {
+			opp-level = <3>;
+			....
+		};
+	};
+
+....
+
+soc {
+....
+	cprpd: cpr@b018000 {
+		compatible = "qcom,qcs404-cpr", "qcom,cpr";
+		reg = <0x0b018000 0x1000>;
+		....
+		vdd-apc-supply = <&pms405_s3>;
+		#power-domain-cells = <0>;
+		operating-points-v2 = <&cpr_opp_table>;
+		....
+	};
+};