# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/opp/allwinner,sun50i-h6-operating-points.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Allwinner H6 CPU OPP Device Tree Bindings
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maintainers:
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- Chen-Yu Tsai <wens@csie.org>
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- Maxime Ripard <mripard@kernel.org>
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description: |
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For some SoCs, the CPU frequency subset and voltage value of each
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OPP varies based on the silicon variant in use. Allwinner Process
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Voltage Scaling Tables defines the voltage and frequency value based
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on the speedbin blown in the efuse combination. The
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sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
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provide the OPP framework with required information.
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properties:
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compatible:
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const: allwinner,sun50i-h6-operating-points
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nvmem-cells:
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description: |
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A phandle pointing to a nvmem-cells node representing the efuse
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registers that has information about the speedbin that is used
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to select the right frequency/voltage value pair. Please refer
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the for nvmem-cells bindings
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Documentation/devicetree/bindings/nvmem/nvmem.txt and also
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examples below.
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opp-shared: true
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required:
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- compatible
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- nvmem-cells
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patternProperties:
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"opp-[0-9]+":
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type: object
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properties:
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opp-hz: true
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patternProperties:
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"opp-microvolt-.*": true
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required:
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- opp-hz
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- opp-microvolt-speed0
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- opp-microvolt-speed1
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- opp-microvolt-speed2
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unevaluatedProperties: false
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additionalProperties: false
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examples:
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- |
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cpu_opp_table: opp-table {
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compatible = "allwinner,sun50i-h6-operating-points";
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nvmem-cells = <&speedbin_efuse>;
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opp-shared;
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opp-480000000 {
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clock-latency-ns = <244144>; /* 8 32k periods */
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opp-hz = /bits/ 64 <480000000>;
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opp-microvolt-speed0 = <880000>;
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opp-microvolt-speed1 = <820000>;
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opp-microvolt-speed2 = <800000>;
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};
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opp-720000000 {
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clock-latency-ns = <244144>; /* 8 32k periods */
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opp-hz = /bits/ 64 <720000000>;
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opp-microvolt-speed0 = <880000>;
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opp-microvolt-speed1 = <820000>;
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opp-microvolt-speed2 = <800000>;
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};
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opp-816000000 {
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clock-latency-ns = <244144>; /* 8 32k periods */
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opp-hz = /bits/ 64 <816000000>;
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opp-microvolt-speed0 = <880000>;
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opp-microvolt-speed1 = <820000>;
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opp-microvolt-speed2 = <800000>;
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};
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opp-888000000 {
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clock-latency-ns = <244144>; /* 8 32k periods */
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opp-hz = /bits/ 64 <888000000>;
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opp-microvolt-speed0 = <940000>;
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opp-microvolt-speed1 = <820000>;
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opp-microvolt-speed2 = <800000>;
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};
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opp-1080000000 {
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clock-latency-ns = <244144>; /* 8 32k periods */
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opp-hz = /bits/ 64 <1080000000>;
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opp-microvolt-speed0 = <1060000>;
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opp-microvolt-speed1 = <880000>;
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opp-microvolt-speed2 = <840000>;
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};
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opp-1320000000 {
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clock-latency-ns = <244144>; /* 8 32k periods */
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opp-hz = /bits/ 64 <1320000000>;
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opp-microvolt-speed0 = <1160000>;
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opp-microvolt-speed1 = <940000>;
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opp-microvolt-speed2 = <900000>;
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};
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opp-1488000000 {
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clock-latency-ns = <244144>; /* 8 32k periods */
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opp-hz = /bits/ 64 <1488000000>;
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opp-microvolt-speed0 = <1160000>;
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opp-microvolt-speed1 = <1000000>;
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opp-microvolt-speed2 = <960000>;
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};
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};
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...
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