linux-kernel - [PATCH] dt-bindings: regulators: Document Tegra regulator coupling in json-schema

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Date:   Mon,  6 Dec 2021 16:40:32 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Dmitry Osipenko <digetx@...il.com>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: regulators: Document Tegra regulator coupling in json-schema

From: Thierry Reding <treding@...dia.com>

Move the NVIDIA Tegra regulator coupling bindings from the free-form
text format into the existing json-schema file for regulators.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 .../nvidia,tegra-regulators-coupling.txt      | 65 -------------------
 .../bindings/regulator/regulator.yaml         | 22 +++++++
 2 files changed, 22 insertions(+), 65 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt

diff --git a/Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt b/Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt
deleted file mode 100644
index 4bf2dbf7c6cc..000000000000
--- a/Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt
+++ /dev/null
@@ -1,65 +0,0 @@
-NVIDIA Tegra Regulators Coupling
-================================
-
-NVIDIA Tegra SoC's have a mandatory voltage-coupling between regulators.
-Thus on Tegra20 there are 3 coupled regulators and on NVIDIA Tegra30
-there are 2.
-
-Tegra20 voltage coupling
-------------------------
-
-On Tegra20 SoC's there are 3 coupled regulators: CORE, RTC and CPU.
-The CORE and RTC voltages shall be in a range of 170mV from each other
-and they both shall be higher than the CPU voltage by at least 120mV.
-
-Tegra30 voltage coupling
-------------------------
-
-On Tegra30 SoC's there are 2 coupled regulators: CORE and CPU. The CORE
-and CPU voltages shall be in a range of 300mV from each other and CORE
-voltage shall be higher than the CPU by N mV, where N depends on the CPU
-voltage.
-
-Required properties:
-- nvidia,tegra-core-regulator: Boolean property that designates regulator
-  as the "Core domain" voltage regulator.
-- nvidia,tegra-rtc-regulator: Boolean property that designates regulator
-  as the "RTC domain" voltage regulator.
-- nvidia,tegra-cpu-regulator: Boolean property that designates regulator
-  as the "CPU domain" voltage regulator.
-
-Example:
-
-	pmic {
-		regulators {
-			core_vdd_reg: core {
-				regulator-name = "vdd_core";
-				regulator-min-microvolt = <950000>;
-				regulator-max-microvolt = <1300000>;
-				regulator-coupled-with = <&rtc_vdd_reg &cpu_vdd_reg>;
-				regulator-coupled-max-spread = <170000 550000>;
-
-				nvidia,tegra-core-regulator;
-			};
-
-			rtc_vdd_reg: rtc {
-				regulator-name = "vdd_rtc";
-				regulator-min-microvolt = <950000>;
-				regulator-max-microvolt = <1300000>;
-				regulator-coupled-with = <&core_vdd_reg &cpu_vdd_reg>;
-				regulator-coupled-max-spread = <170000 550000>;
-
-				nvidia,tegra-rtc-regulator;
-			};
-
-			cpu_vdd_reg: cpu {
-				regulator-name = "vdd_cpu";
-				regulator-min-microvolt = <750000>;
-				regulator-max-microvolt = <1125000>;
-				regulator-coupled-with = <&core_vdd_reg &rtc_vdd_reg>;
-				regulator-coupled-max-spread = <550000 550000>;
-
-				nvidia,tegra-cpu-regulator;
-			};
-		};
-	};
diff --git a/Documentation/devicetree/bindings/regulator/regulator.yaml b/Documentation/devicetree/bindings/regulator/regulator.yaml
index ed560ee8714e..14f269f1e877 100644
--- a/Documentation/devicetree/bindings/regulator/regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/regulator.yaml
@@ -224,6 +224,28 @@ properties:
     description: Maximum difference between current and target voltages
       that can be changed safely in a single step.
 
+  # NVIDIA Tegra SoC's have a mandatory voltage-coupling between regulators. Thus on Tegra20 there
+  # are 3 coupled regulators and on NVIDIA Tegra30 there are 2.
+  #
+  # The 3 coupled regulators on Tegra20 are: CORE, RTC and CPU. The CORE and RTC voltages shall be
+  # in a range of 170 mV of each other and they both shall be higher than the CPU voltage by at
+  # least 120 mV.
+  #
+  # The 2 coupled regulators on Tegra30 are: CORE and CPU. The CORE and CPU voltages shall be in
+  # a range of 300 mV of each other and CORE voltage shall be higher than the CPU by N mV, where
+  # N depends on the CPU voltage.
+  nvidia,tegra-core-regulator:
+    $ref: "/schemas/types.yaml#/definitions/flag"
+    description: if present, designates the regulator as the "CORE domain" voltage regulator
+
+  nvidia,tegra-rtc-regulator:
+    $ref: "/schemas/types.yaml#/definitions/flag"
+    description: if present, designates the regulator as the "RTC domain" voltage regulator
+
+  nvidia,tegra-cpu-regulator:
+    $ref: "/schemas/types.yaml#/definitions/flag"
+    description: if present, designates the regulator as the "CPU domain" voltage regulator
+
 patternProperties:
   ".*-supply$":
     description: Input supply phandle(s) for this node
-- 
2.33.1