[PATCH v4 2/3] dt-bindings: hwmon: pmbus: add MPS MPQ8646 binding

[Vincent Jardin via B4 Relay]

From: Vincent Jardin <vjardin@xxxxxxx>

Add a device-tree binding for the Monolithic Power Systems
MPQ8646 step-down converter as a PMBus device.

The schema is inspired from the mpq8785e:
same mps,vout-fb-divider-ratio-permille property (maximum: 2047),
and const: mps,mpq8646.

Signed-off-by: Vincent Jardin <vjardin@xxxxxxx>
---
 .../bindings/hwmon/pmbus/mps,mpq8646.yaml          | 50 ++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8646.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8646.yaml
new file mode 100644
index 000000000000..7acf4f235b12
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/pmbus/mps,mpq8646.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright (c) 2026 Free Mobile - Vincent Jardin <vjardin@xxxxxxx>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/pmbus/mps,mpq8646.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Monolithic Power Systems MPQ8646 PMBus Step-Down Converter (extended)
+
+maintainers:
+  - Vincent Jardin <vjardin@xxxxxxx>
+
+description: |
+  MPS MPQ8646 PMBus step-down converter.
+
+properties:
+  compatible:
+    const: mps,mpq8646
+
+  reg:
+    maxItems: 1
+
+  mps,vout-fb-divider-ratio-permille:
+    description:
+      The feedback resistor divider ratio, expressed in permille
+      (Vfb / Vout * 1000). This value is written to the
+      PMBUS_VOUT_SCALE_LOOP register and is required for correct output
+      voltage presentation.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 2047
+    default: 706
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      regulator@10 {
+        compatible = "mps,mpq8646";
+        reg = <0x10>;
+      };
+    };

-- 
2.43.0