Add ADT7604 support to LTC2983 driver

Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml

@@ -4,14 +4,14 @@
 $id: http://devicetree.org/schemas/iio/temperature/adi,ltc2983.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Analog Devices LTC2983, LTC2986, LTM2985 Multi-sensor Temperature system
+title: Analog Devices LTC2983, LTC2986, LTM2985, ADT7604 Multi-sensor Temperature system
 
 maintainers:
   - Nuno Sá <nuno.sa@analog.com>
 
 description: |
-  Analog Devices LTC2983, LTC2984, LTC2986, LTM2985 Multi-Sensor Digital
-  Temperature Measurement Systems
+  Analog Devices LTC2983, LTC2984, LTC2986, LTM2985, ADT7604 Multi-Sensor
+  Digital Temperature Measurement Systems
 
   https://www.analog.com/media/en/technical-documentation/data-sheets/2983fc.pdf
   https://www.analog.com/media/en/technical-documentation/data-sheets/2984fb.pdf
@@ -44,6 +44,7 @@ properties:
   compatible:
     oneOf:
       - enum:
+          - adi,adt7604
           - adi,ltc2983
           - adi,ltc2986
           - adi,ltm2985
@@ -437,6 +438,96 @@ patternProperties:
     required:
       - adi,custom-temp
 
+  "^copper-trace@":
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
+    description: |
+      Copper trace resistance sensor (ADT7604 only). Uses the custom RTD
+      sensor type (18). Two variants exist: sub-ohm (< 1 ohm, no custom
+      table allowed) and standard (> 1 ohm, optional custom table).
+
+    properties:
+      reg:
+        minimum: 2
+        maximum: 20
+
+      adi,sensor-type:
+        description: Sensor type for copper trace sensors.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        const: 18
+
+      adi,rsense-handle:
+        description: Associated sense resistor sensor.
+        $ref: /schemas/types.yaml#/definitions/phandle
+
+      adi,copper-trace-sub-ohm:
+        description:
+          Select the sub-ohm (< 1 ohm) copper trace variant. Custom table
+          and excitation current are not allowed in this mode.
+        type: boolean
+
+      adi,custom-rtd:
+        description:
+          Optional resistance-to-temperature table for copper trace sensors
+          with resistance > 1 ohm. See Page 62 of the datasheet.
+        $ref: /schemas/types.yaml#/definitions/uint64-matrix
+        minItems: 3
+        maxItems: 64
+        items:
+          items:
+            - description: Resistance point in uOhms.
+            - description: Temperature point in uK.
+
+    required:
+      - adi,rsense-handle
+
+    allOf:
+      - if:
+          required:
+            - adi,copper-trace-sub-ohm
+        then:
+          properties:
+            adi,custom-rtd: false
+
+  "^leak-detector@":
+    $ref: '#/$defs/sensor-node'
+    unevaluatedProperties: false
+    description: |
+      Leak detector sensor (ADT7604 only). Uses the custom thermistor sensor
+      type (27). Outputs resistance in ohms and, when a custom table is
+      provided, a coverage percentage via IIO_TEMP (raw/1024 = coverage %).
+
+    properties:
+      reg:
+        minimum: 2
+        maximum: 20
+
+      adi,sensor-type:
+        description: Sensor type for leak detector sensors.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        const: 27
+
+      adi,rsense-handle:
+        description: Associated sense resistor sensor.
+        $ref: /schemas/types.yaml#/definitions/phandle
+
+      adi,custom-leak-detector:
+        description: |
+          Lookup table mapping resistance to coverage data. Entries must be
+          in ascending resistance order. The coverage data field encodes the
+          coverage percentage P as (P + 273.15) expressed in uK, i.e.
+          (P * 1000000 + 273150000).
+        $ref: /schemas/types.yaml#/definitions/uint64-matrix
+        minItems: 3
+        maxItems: 64
+        items:
+          items:
+            - description: Resistance point in uOhms.
+            - description: Coverage data point (P + 273150000) in uK.
+
+    required:
+      - adi,rsense-handle
+
   "^rsense@":
     $ref: '#/$defs/sensor-node'
     unevaluatedProperties: false
@@ -478,6 +569,22 @@ allOf:
       patternProperties:
         "^temp@": false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: adi,adt7604
+    then:
+      patternProperties:
+        "^thermocouple@": false
+        "^diode@": false
+        "^adc@": false
+        "^temp@": false
+    else:
+      patternProperties:
+        "^copper-trace@": false
+        "^leak-detector@": false
+
 examples:
   - |
     #include <dt-bindings/interrupt-controller/irq.h>
@@ -557,4 +664,61 @@ examples:
             };
         };
     };
+
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        temperature-sensor@0 {
+            compatible = "adi,adt7604";
+            reg = <0>;
+            interrupt-parent = <&gpio>;
+            interrupts = <25 IRQ_TYPE_EDGE_RISING>;
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+            vdd-supply = <&supply>;
+
+            trace_rsense: rsense@2 {
+                reg = <2>;
+                adi,sensor-type = <29>;
+                adi,rsense-val-milli-ohms = <100000>; // 100 ohm
+            };
+
+            copper-trace@4 {
+                reg = <4>;
+                adi,sensor-type = <18>;
+                adi,rsense-handle = <&trace_rsense>;
+                adi,copper-trace-sub-ohm;
+            };
+
+            r_sense: rsense@12 {
+                reg = <12>;
+                adi,sensor-type = <29>;
+                adi,rsense-val-milli-ohms = <1000000>; // 1 kohm
+            };
+
+            leak-detector@14 {
+                reg = <14>;
+                adi,sensor-type = <27>;
+                adi,rsense-handle = <&r_sense>;
+                adi,custom-leak-detector =
+                    /bits/ 64 <          0 373150000>,
+                    /bits/ 64 <  202020000 372150000>,
+                    /bits/ 64 < 1000000000 293150000>;
+            };
+
+            rtd@18 {
+                reg = <18>;
+                adi,sensor-type = <12>; // PT100
+                adi,rsense-handle = <&r_sense>;
+                adi,number-of-wires = <2>;
+                adi,rsense-share;
+                adi,excitation-current-microamp = <500>;
+                adi,rtd-curve = <0>;
+            };
+        };
+    };
 ...