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Message-ID: <20230811031458.957624-3-nm@ti.com>
Date: Thu, 10 Aug 2023 22:14:58 -0500
From: Nishanth Menon <nm@...com>
To: Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
Conor Dooley <conor+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
"Rafael J. Wysocki" <rafael@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
Vibhore Vardhan <vibhore@...com>, Dhruva Gole <d-gole@...com>
Subject: [PATCH V4 2/2] 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.
Signed-off-by: Nishanth Menon <nm@...com>
---
Changes since V3:
* Rewrote the description of the binding to something more relevant to
current style of documentation.
* Due to the rewrite in description, I have dropped Dhruva's
Reviewed-by.
V3: https://lore.kernel.org/all/20230809023045.1870410-3-nm@ti.com/
V2: https://lore.kernel.org/all/20230801233341.1416552-3-nm@ti.com
V1: https://lore.kernel.org/all/20230724153911.1376830-6-nm@ti.com/
.../bindings/cpufreq/ti-cpufreq.txt | 132 ------------------
.../opp/operating-points-v2-ti-cpu.yaml | 92 ++++++++++++
2 files changed, 92 insertions(+), 132 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/cpufreq/ti-cpufreq.txt
create mode 100644 Documentation/devicetree/bindings/opp/operating-points-v2-ti-cpu.yaml
diff --git a/Documentation/devicetree/bindings/cpufreq/ti-cpufreq.txt b/Documentation/devicetree/bindings/cpufreq/ti-cpufreq.txt
deleted file mode 100644
index 1758051798fe..000000000000
--- a/Documentation/devicetree/bindings/cpufreq/ti-cpufreq.txt
+++ /dev/null
@@ -1,132 +0,0 @@
-TI CPUFreq and OPP bindings
-================================
-
-Certain TI SoCs, like those in the am335x, am437x, am57xx, and dra7xx
-families support different OPPs depending on the silicon variant in use.
-The ti-cpufreq driver can use revision and an efuse value from the SoC to
-provide the OPP framework with supported hardware information. This is
-used to determine which OPPs from the operating-points-v2 table get enabled
-when it is parsed by the OPP framework.
-
-Required properties:
---------------------
-In 'cpus' nodes:
-- operating-points-v2: Phandle to the operating-points-v2 table to use.
-
-In 'operating-points-v2' table:
-- compatible: Should be
- - 'operating-points-v2-ti-cpu' for am335x, am43xx, and dra7xx/am57xx,
- omap34xx, omap36xx and am3517 SoCs
-- syscon: A phandle pointing to a syscon node representing the control module
- register space of the SoC.
-
-Optional properties:
---------------------
-- "vdd-supply", "vbb-supply": to define two regulators for dra7xx
-- "cpu0-supply", "vbb-supply": to define two regulators for omap36xx
-
-For each opp entry in 'operating-points-v2' table:
-- opp-supported-hw: Two bitfields indicating:
- 1. Which revision of the SoC the OPP is supported by
- 2. Which eFuse bits indicate this OPP is available
-
- A bitwise AND is performed against these values and if any bit
- matches, the OPP gets enabled.
-
-Example:
---------
-
-/* From arch/arm/boot/dts/am33xx.dtsi */
-cpus {
- #address-cells = <1>;
- #size-cells = <0>;
- cpu@0 {
- compatible = "arm,cortex-a8";
- device_type = "cpu";
- reg = <0>;
-
- operating-points-v2 = <&cpu0_opp_table>;
-
- clocks = <&dpll_mpu_ck>;
- clock-names = "cpu";
-
- clock-latency = <300000>; /* From omap-cpufreq driver */
- };
-};
-
-/*
- * cpu0 has different OPPs depending on SoC revision and some on revisions
- * 0x2 and 0x4 have eFuse bits that indicate if they are available or not
- */
-cpu0_opp_table: opp-table {
- compatible = "operating-points-v2-ti-cpu";
- syscon = <&scm_conf>;
-
- /*
- * The three following nodes are marked with opp-suspend
- * because they can not be enabled simultaneously on a
- * single SoC.
- */
- opp50-300000000 {
- opp-hz = /bits/ 64 <300000000>;
- opp-microvolt = <950000 931000 969000>;
- opp-supported-hw = <0x06 0x0010>;
- opp-suspend;
- };
-
- opp100-275000000 {
- opp-hz = /bits/ 64 <275000000>;
- opp-microvolt = <1100000 1078000 1122000>;
- opp-supported-hw = <0x01 0x00FF>;
- opp-suspend;
- };
-
- opp100-300000000 {
- opp-hz = /bits/ 64 <300000000>;
- opp-microvolt = <1100000 1078000 1122000>;
- opp-supported-hw = <0x06 0x0020>;
- opp-suspend;
- };
-
- opp100-500000000 {
- opp-hz = /bits/ 64 <500000000>;
- opp-microvolt = <1100000 1078000 1122000>;
- opp-supported-hw = <0x01 0xFFFF>;
- };
-
- opp100-600000000 {
- opp-hz = /bits/ 64 <600000000>;
- opp-microvolt = <1100000 1078000 1122000>;
- opp-supported-hw = <0x06 0x0040>;
- };
-
- opp120-600000000 {
- opp-hz = /bits/ 64 <600000000>;
- opp-microvolt = <1200000 1176000 1224000>;
- opp-supported-hw = <0x01 0xFFFF>;
- };
-
- opp120-720000000 {
- opp-hz = /bits/ 64 <720000000>;
- opp-microvolt = <1200000 1176000 1224000>;
- opp-supported-hw = <0x06 0x0080>;
- };
-
- oppturbo-720000000 {
- opp-hz = /bits/ 64 <720000000>;
- opp-microvolt = <1260000 1234800 1285200>;
- opp-supported-hw = <0x01 0xFFFF>;
- };
-
- oppturbo-800000000 {
- opp-hz = /bits/ 64 <800000000>;
- opp-microvolt = <1260000 1234800 1285200>;
- opp-supported-hw = <0x06 0x0100>;
- };
-
- oppnitro-1000000000 {
- opp-hz = /bits/ 64 <1000000000>;
- opp-microvolt = <1325000 1298500 1351500>;
- opp-supported-hw = <0x04 0x0200>;
- };
-};
diff --git a/Documentation/devicetree/bindings/opp/operating-points-v2-ti-cpu.yaml b/Documentation/devicetree/bindings/opp/operating-points-v2-ti-cpu.yaml
new file mode 100644
index 000000000000..02d1d2c17129
--- /dev/null
+++ b/Documentation/devicetree/bindings/opp/operating-points-v2-ti-cpu.yaml
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/opp/operating-points-v2-ti-cpu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI CPU OPP (Operating Performance Points)
+
+description:
+ TI SoCs, like those in the AM335x, AM437x, AM57xx, AM62x, and DRA7xx
+ families, the CPU frequencies subset and the voltage value of each
+ OPP vary based on the silicon variant used. The data sheet sections
+ corresponding to "Operating Performance Points" describe the frequency
+ and voltage values based on device type and speed bin information
+ blown in corresponding eFuse bits as referred to by the Technical
+ Reference Manual.
+
+ This document extends the operating-points-v2 binding by providing
+ the hardware description for the scheme mentioned above.
+
+maintainers:
+ - Nishanth Menon <nm@...com>
+
+allOf:
+ - $ref: opp-v2-base.yaml#
+
+properties:
+ compatible:
+ const: operating-points-v2-ti-cpu
+
+ syscon:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: |
+ points to syscon node representing the control module
+ register space of the SoC.
+
+ opp-shared: true
+
+patternProperties:
+ '^opp(-?[0-9]+)*$':
+ type: object
+ additionalProperties: false
+
+ properties:
+ clock-latency-ns: true
+ opp-hz: true
+ opp-microvolt: true
+ opp-supported-hw: true
+ opp-suspend: true
+ turbo-mode: true
+
+ required:
+ - opp-hz
+ - opp-supported-hw
+
+required:
+ - compatible
+ - syscon
+
+additionalProperties: false
+
+examples:
+ - |
+ opp-table {
+ compatible = "operating-points-v2-ti-cpu";
+ syscon = <&scm_conf>;
+
+ opp-300000000 {
+ opp-hz = /bits/ 64 <300000000>;
+ opp-microvolt = <1100000 1078000 1122000>;
+ opp-supported-hw = <0x06 0x0020>;
+ opp-suspend;
+ };
+
+ opp-500000000 {
+ opp-hz = /bits/ 64 <500000000>;
+ opp-microvolt = <1100000 1078000 1122000>;
+ opp-supported-hw = <0x01 0xFFFF>;
+ };
+
+ opp-600000000 {
+ opp-hz = /bits/ 64 <600000000>;
+ opp-microvolt = <1100000 1078000 1122000>;
+ opp-supported-hw = <0x06 0x0040>;
+ };
+
+ opp-1000000000 {
+ opp-hz = /bits/ 64 <1000000000>;
+ opp-microvolt = <1325000 1298500 1351500>;
+ opp-supported-hw = <0x04 0x0200>;
+ };
+ };
--
2.40.0
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