[PATCH V2 1/2] dt-bindings: opp: Convert ti-omap5-opp-supply to json schema

[Nishanth Menon]

Rename ti-omap5-opp-supply to be bit more generic omap-opp-supply and
convert the free text binding to json-schema.

Signed-off-by: Nishanth Menon <nm@xxxxxx>
---

Changes since V1:
- Dropped "description" and various verbage fixups
- Dropped un-used labels
- Introduced value constraints (Thanks Rob for the hint in IRC) -
  introduced it for absolute-max-voltage and the efuse tuples
- Fixup $subject of the patch to indicate json schema rather than yaml.

V1: https://lore.kernel.org/all/20230724153911.1376830-5-nm@xxxxxx/

Side note: cleanups in dt is picked up on Tony's tree:
https://lore.kernel.org/all/20230731062551.GH5194@xxxxxxxxxxx/

 .../bindings/opp/ti,omap-opp-supply.yaml      | 103 ++++++++++++++++++
 .../bindings/opp/ti-omap5-opp-supply.txt      |  63 -----------
 2 files changed, 103 insertions(+), 63 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/opp/ti,omap-opp-supply.yaml
 delete mode 100644 Documentation/devicetree/bindings/opp/ti-omap5-opp-supply.txt

diff --git a/Documentation/devicetree/bindings/opp/ti,omap-opp-supply.yaml b/Documentation/devicetree/bindings/opp/ti,omap-opp-supply.yaml
new file mode 100644
index 000000000000..4db80e418829
--- /dev/null
+++ b/Documentation/devicetree/bindings/opp/ti,omap-opp-supply.yaml
@@ -0,0 +1,103 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/opp/ti,omap-opp-supply.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments OMAP compatible OPP supply
+
+description:
+  OMAP5, DRA7, and AM57 family of SoCs have Class0 AVS eFuse registers which
+  contain data that can be used to adjust voltages programmed for some of their
+  supplies for more efficient operation. This binding provides the information
+  needed to read these values and use them to program the main regulator during
+  an OPP transitions.
+
+  Also, some supplies may have an associated vbb-supply which is an Adaptive Body
+  Bias regulator which much be transitioned in a specific sequence with regards
+  to the vdd-supply and clk when making an OPP transition. By supplying two
+  regulators to the device that will undergo OPP transitions we can make use
+  of the multi regulator binding that is part of the OPP core described
+  to describe both regulators needed by the platform.
+
+maintainers:
+  - Nishanth Menon <nm@xxxxxx>
+
+properties:
+  $nodename:
+    pattern: '^opp-supply(@[0-9a-f]+)?$'
+
+  compatible:
+    oneOf:
+      - description: Basic OPP supply controlling VDD and VBB
+        items:
+          - const: ti,omap-opp-supply
+      - description: OMAP5+ optimized voltages in efuse(Class 0) VDD along with
+          VBB.
+        items:
+          - const: ti,omap5-opp-supply
+      - description: OMAP5+ optimized voltages in efuse(class0) VDD but no VBB
+        items:
+          - const: ti,omap5-core-opp-supply
+
+  reg:
+    maxItems: 1
+
+  ti,absolute-max-voltage-uv:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Absolute maximum voltage for the OPP supply in micro-volts.
+    minimum: 750000
+    maximum: 1500000
+
+  ti,efuse-settings:
+    description: An array of u32 tuple items providing information about
+      optimized efuse configuration.
+    minItems: 1
+    $ref: /schemas/types.yaml#/definitions/uint32-matrix
+    items:
+      items:
+        -
+          description: Reference voltage in micro-volts (OPP Voltage)
+          minimum: 750000
+          maximum: 1500000
+          multipleOf: 10000
+        -
+          description: efuse offset where the optimized voltage is located
+          multipleOf: 4
+          maximum: 256
+
+required:
+  - compatible
+  - ti,absolute-max-voltage-uv
+
+allOf:
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: ti,omap-opp-supply
+    then:
+      required:
+        - reg
+        - ti,efuse-settings
+
+additionalProperties: false
+
+examples:
+  - |
+    opp-supply {
+        compatible = "ti,omap-opp-supply";
+        ti,absolute-max-voltage-uv = <1375000>;
+    };
+  - |
+    opp-supply@4a003b20 {
+        compatible = "ti,omap5-opp-supply";
+        reg = <0x4a003b20 0x8>;
+        ti,efuse-settings =
+            /* uV   offset */
+            <1060000 0x0>,
+            <1160000 0x4>,
+            <1210000 0x8>;
+        ti,absolute-max-voltage-uv = <1500000>;
+    };
diff --git a/Documentation/devicetree/bindings/opp/ti-omap5-opp-supply.txt b/Documentation/devicetree/bindings/opp/ti-omap5-opp-supply.txt
deleted file mode 100644
index b70d326117cd..000000000000
--- a/Documentation/devicetree/bindings/opp/ti-omap5-opp-supply.txt
+++ /dev/null
@@ -1,63 +0,0 @@
-Texas Instruments OMAP compatible OPP supply description
-
-OMAP5, DRA7, and AM57 family of SoCs have Class0 AVS eFuse registers which
-contain data that can be used to adjust voltages programmed for some of their
-supplies for more efficient operation. This binding provides the information
-needed to read these values and use them to program the main regulator during
-an OPP transitions.
-
-Also, some supplies may have an associated vbb-supply which is an Adaptive Body
-Bias regulator which much be transitioned in a specific sequence with regards
-to the vdd-supply and clk when making an OPP transition. By supplying two
-regulators to the device that will undergo OPP transitions we can make use
-of the multi regulator binding that is part of the OPP core described here [1]
-to describe both regulators needed by the platform.
-
-[1] Documentation/devicetree/bindings/opp/opp-v2.yaml
-
-Required Properties for Device Node:
-- vdd-supply: phandle to regulator controlling VDD supply
-- vbb-supply: phandle to regulator controlling Body Bias supply
-	      (Usually Adaptive Body Bias regulator)
-
-Required Properties for opp-supply node:
-- compatible: Should be one of:
-	"ti,omap-opp-supply" - basic OPP supply controlling VDD and VBB
-	"ti,omap5-opp-supply" - OMAP5+ optimized voltages in efuse(class0)VDD
-			    along with VBB
-	"ti,omap5-core-opp-supply" - OMAP5+ optimized voltages in efuse(class0) VDD
-			    but no VBB.
-- reg: Address and length of the efuse register set for the device (mandatory
-	only for "ti,omap5-opp-supply")
-- ti,efuse-settings: An array of u32 tuple items providing information about
-	optimized efuse configuration. Each item consists of the following:
-	volt: voltage in uV - reference voltage (OPP voltage)
-	efuse_offseet: efuse offset from reg where the optimized voltage is stored.
-- ti,absolute-max-voltage-uv: absolute maximum voltage for the OPP supply.
-
-Example:
-
-/* Device Node (CPU)  */
-cpus {
-	cpu0: cpu@0 {
-		device_type = "cpu";
-
-		...
-
-		vdd-supply = <&vcc>;
-		vbb-supply = <&abb_mpu>;
-	};
-};
-
-/* OMAP OPP Supply with Class0 registers */
-opp_supply_mpu: opp_supply@4a003b20 {
-	compatible = "ti,omap5-opp-supply";
-	reg = <0x4a003b20 0x8>;
-	ti,efuse-settings = <
-	/* uV   offset */
-	1060000 0x0
-	1160000 0x4
-	1210000 0x8
-	>;
-	ti,absolute-max-voltage-uv = <1500000>;
-};
-- 
2.40.0