dt-bindings: cpufreq: Convert ti-cpufreq to json schema
Move the ti-cpufreq binding over to opp and convert the free text binding to json-schema. Reviewed-by: Dhruva Gole <d-gole@ti.com> Signed-off-by: Nishanth Menon <nm@ti.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Nishanth Menon
Viresh Kumar
parent
bbc2bf1388
commit
e576a9a860
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TI CPUFreq and OPP bindings
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================================
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Certain TI SoCs, like those in the am335x, am437x, am57xx, and dra7xx
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families support different OPPs depending on the silicon variant in use.
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The ti-cpufreq driver can use revision and an efuse value from the SoC to
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provide the OPP framework with supported hardware information. This is
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used to determine which OPPs from the operating-points-v2 table get enabled
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when it is parsed by the OPP framework.
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Required properties:
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--------------------
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In 'cpus' nodes:
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- operating-points-v2: Phandle to the operating-points-v2 table to use.
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In 'operating-points-v2' table:
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- compatible: Should be
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- 'operating-points-v2-ti-cpu' for am335x, am43xx, and dra7xx/am57xx,
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omap34xx, omap36xx and am3517 SoCs
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- syscon: A phandle pointing to a syscon node representing the control module
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register space of the SoC.
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Optional properties:
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--------------------
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- "vdd-supply", "vbb-supply": to define two regulators for dra7xx
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- "cpu0-supply", "vbb-supply": to define two regulators for omap36xx
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For each opp entry in 'operating-points-v2' table:
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- opp-supported-hw: Two bitfields indicating:
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1. Which revision of the SoC the OPP is supported by
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2. Which eFuse bits indicate this OPP is available
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A bitwise AND is performed against these values and if any bit
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matches, the OPP gets enabled.
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Example:
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--------
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/* From arch/arm/boot/dts/am33xx.dtsi */
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cpus {
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#address-cells = <1>;
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#size-cells = <0>;
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cpu@0 {
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compatible = "arm,cortex-a8";
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device_type = "cpu";
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reg = <0>;
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operating-points-v2 = <&cpu0_opp_table>;
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clocks = <&dpll_mpu_ck>;
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clock-names = "cpu";
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clock-latency = <300000>; /* From omap-cpufreq driver */
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};
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};
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/*
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* cpu0 has different OPPs depending on SoC revision and some on revisions
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* 0x2 and 0x4 have eFuse bits that indicate if they are available or not
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*/
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cpu0_opp_table: opp-table {
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compatible = "operating-points-v2-ti-cpu";
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syscon = <&scm_conf>;
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/*
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* The three following nodes are marked with opp-suspend
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* because they can not be enabled simultaneously on a
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* single SoC.
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*/
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opp50-300000000 {
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opp-hz = /bits/ 64 <300000000>;
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opp-microvolt = <950000 931000 969000>;
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opp-supported-hw = <0x06 0x0010>;
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opp-suspend;
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};
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opp100-275000000 {
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opp-hz = /bits/ 64 <275000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x01 0x00FF>;
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opp-suspend;
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};
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opp100-300000000 {
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opp-hz = /bits/ 64 <300000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x06 0x0020>;
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opp-suspend;
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};
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opp100-500000000 {
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opp-hz = /bits/ 64 <500000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x01 0xFFFF>;
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};
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opp100-600000000 {
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opp-hz = /bits/ 64 <600000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x06 0x0040>;
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};
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opp120-600000000 {
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opp-hz = /bits/ 64 <600000000>;
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opp-microvolt = <1200000 1176000 1224000>;
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opp-supported-hw = <0x01 0xFFFF>;
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};
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opp120-720000000 {
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opp-hz = /bits/ 64 <720000000>;
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opp-microvolt = <1200000 1176000 1224000>;
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opp-supported-hw = <0x06 0x0080>;
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};
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oppturbo-720000000 {
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opp-hz = /bits/ 64 <720000000>;
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opp-microvolt = <1260000 1234800 1285200>;
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opp-supported-hw = <0x01 0xFFFF>;
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};
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oppturbo-800000000 {
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opp-hz = /bits/ 64 <800000000>;
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opp-microvolt = <1260000 1234800 1285200>;
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opp-supported-hw = <0x06 0x0100>;
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};
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oppnitro-1000000000 {
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opp-hz = /bits/ 64 <1000000000>;
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opp-microvolt = <1325000 1298500 1351500>;
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opp-supported-hw = <0x04 0x0200>;
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};
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};
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@ -0,0 +1,92 @@
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/opp/operating-points-v2-ti-cpu.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: TI CPU OPP (Operating Performance Points)
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description:
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TI SoCs, like those in the AM335x, AM437x, AM57xx, AM62x, and DRA7xx
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families, the CPU frequencies subset and the voltage value of each
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OPP vary based on the silicon variant used. The data sheet sections
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corresponding to "Operating Performance Points" describe the frequency
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and voltage values based on device type and speed bin information
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blown in corresponding eFuse bits as referred to by the Technical
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Reference Manual.
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This document extends the operating-points-v2 binding by providing
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the hardware description for the scheme mentioned above.
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maintainers:
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- Nishanth Menon <nm@ti.com>
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allOf:
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- $ref: opp-v2-base.yaml#
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properties:
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compatible:
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const: operating-points-v2-ti-cpu
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syscon:
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$ref: /schemas/types.yaml#/definitions/phandle
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description: |
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points to syscon node representing the control module
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register space of the SoC.
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opp-shared: true
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patternProperties:
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'^opp(-?[0-9]+)*$':
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type: object
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additionalProperties: false
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properties:
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clock-latency-ns: true
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opp-hz: true
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opp-microvolt: true
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opp-supported-hw: true
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opp-suspend: true
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turbo-mode: true
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required:
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- opp-hz
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- opp-supported-hw
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required:
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- compatible
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- syscon
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additionalProperties: false
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examples:
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- |
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opp-table {
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compatible = "operating-points-v2-ti-cpu";
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syscon = <&scm_conf>;
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opp-300000000 {
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opp-hz = /bits/ 64 <300000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x06 0x0020>;
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opp-suspend;
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};
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opp-500000000 {
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opp-hz = /bits/ 64 <500000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x01 0xFFFF>;
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};
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opp-600000000 {
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opp-hz = /bits/ 64 <600000000>;
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opp-microvolt = <1100000 1078000 1122000>;
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opp-supported-hw = <0x06 0x0040>;
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};
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opp-1000000000 {
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opp-hz = /bits/ 64 <1000000000>;
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opp-microvolt = <1325000 1298500 1351500>;
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opp-supported-hw = <0x04 0x0200>;
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};
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};
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