[PATCH v6 2/2] dt-bindings: hwmon: isl68137: add bindings to support voltage dividers

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Add devicetree bindings to support declaring optional voltage dividers to
the rail outputs of supported digital multiphase regulators. Some
applications require Vout to exceed the voltage range that the Vsense pin
can detect. This binding definition allows users to define the
characteristics of a voltage divider placed between Vout and the Vsense
pin for any rail powered by the device.

These bindings copy the vout-voltage-divider property defined in the
maxim,max20730 bindings schema since it is the best fit for the use case
of scaling hwmon PMBus telemetry. The generic voltage-divider property
used by many iio drivers was determined to be a poor fit because that
schema is tied directly to iio for the purpose of scaling io-channel
voltages and the isl68137 driver is not an iio driver.

Signed-off-by: Grant Peltier <grantpeltier93@xxxxxxxxx>
---
 .../hwmon/pmbus/renesas,isl68137.yaml         | 147 ++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/pmbus/renesas,isl68137.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/renesas,isl68137.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/renesas,isl68137.yaml
new file mode 100644
index 000000000000..ed659c2baadf
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/pmbus/renesas,isl68137.yaml
@@ -0,0 +1,147 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/pmbus/renesas,isl68137.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas Digital Multiphase Voltage Regulators with PMBus
+
+maintainers:
+  - Grant Peltier <grant.peltier.jg@xxxxxxxxxxx>
+
+description: |
+  Renesas digital multiphase voltage regulators with PMBus.
+  https://www.renesas.com/en/products/power-management/multiphase-power/multiphase-dcdc-switching-controllers
+
+properties:
+  compatible:
+    enum:
+      - renesas,isl68220
+      - renesas,isl68221
+      - renesas,isl68222
+      - renesas,isl68223
+      - renesas,isl68224
+      - renesas,isl68225
+      - renesas,isl68226
+      - renesas,isl68227
+      - renesas,isl68229
+      - renesas,isl68233
+      - renesas,isl68239
+      - renesas,isl69222
+      - renesas,isl69223
+      - renesas,isl69224
+      - renesas,isl69225
+      - renesas,isl69227
+      - renesas,isl69228
+      - renesas,isl69234
+      - renesas,isl69236
+      - renesas,isl69239
+      - renesas,isl69242
+      - renesas,isl69243
+      - renesas,isl69247
+      - renesas,isl69248
+      - renesas,isl69254
+      - renesas,isl69255
+      - renesas,isl69256
+      - renesas,isl69259
+      - renesas,isl69260
+      - renesas,isl69268
+      - renesas,isl69269
+      - renesas,isl69298
+      - renesas,raa228000
+      - renesas,raa228004
+      - renesas,raa228006
+      - renesas,raa228228
+      - renesas,raa229001
+      - renesas,raa229004
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+patternProperties:
+  "^channel@([0-3])$":
+    type: object
+    description:
+      Container for properties specific to a particular channel (rail).
+
+    properties:
+      reg:
+        description: The channel (rail) index.
+        items:
+          minimum: 0
+          maximum: 3
+
+      vout-voltage-divider:
+        description: |
+          Resistances of a voltage divider placed between Vout and the voltage
+          sense (Vsense) pin for the given channel (rail). It has two numbers
+          representing the resistances of the voltage divider provided as
+          <Rout Rtotal> which yields an adjusted Vout as
+          Vout_adj = Vout * Rtotal / Rout given the original Vout as reported
+          by the Vsense pin. Given a circuit configuration similar to the one
+          below, Rtotal = R1 + Rout.
+
+            Vout ----.
+                     |
+                  .-----.
+                  | R1  |
+                  '-----'
+                     |
+                     +---- Vsense
+                     |
+                  .-----.
+                  | Rout|
+                  '-----'
+                     |
+                    GND
+
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        minItems: 2
+        maxItems: 2
+
+    required:
+      - reg
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      isl68239@60 {
+        compatible = "renesas,isl68239";
+        reg = <0x60>;
+      };
+    };
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      isl68239@60 {
+        compatible = "renesas,isl68239";
+        reg = <0x60>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        channel@0 {
+          reg = <0>;
+          vout-voltage-divider = <1000 2000>;  // Reported Vout/Pout would be scaled by 2
+        };
+      };
+    };
-- 
2.39.5





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