dt-bindings: hwmon: add bindings for qcom,amoled-ecm

Qualcomm Technologies, Inc. AMOLED ECM provides a method to measure
OLED display power/current consumption. Add the bindings necessary to
describe it.

Change-Id: I6909c0cc5326639ed73baf3a8fb10f62b3d2b1e4

bindings/hwmon/qcom,amoled-ecm.yaml

@@ -0,0 +1,74 @@
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bindings/hwmon/qcom,amoled-ecm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. AMOLED ECM binding
+
+maintainers:
+  - Shyam Kumar Thella <sthella@qti.qualcomm.com>
+
+description: |
+  Qualcomm Technologies, Inc. AMOLED ECM supports measurement of OLED
+  display power/current consumption with a time granularity in sub-frame
+  or multiple frames of image data. A power measurement can be for a
+  shorter period or for a longer period.
+
+properties:
+  compatible:
+    const: qcom,amoled-ecm
+
+  reg:
+    description: Base address of AMOLED AB module. Registers of
+      AMOLED ECM are part of AMOLED AB module.
+    maxItems: 1
+
+  nvmem-names:
+    minItems: 1
+    description: Array of one or more nvmem device name(s) for ECM
+      measurement.
+    items:
+      - const: amoled-ecm-sdam0
+      - const: amoled-ecm-sdam1
+    $ref: /schemas/types.yaml#/definitions/string-array
+
+  nvmem:
+    minItems: 1
+    description: Array of one or more phandles of the nvmem device(s)
+      for ECM measurement.
+    $ref: /schemas/nvmem/nvmem.yaml
+
+  interrupts:
+    description: Specifies the interrupts for nvmem devices used by
+      AMOLED ECM.
+    minItems: 1
+    $ref: /schemas/interrupts.yaml
+
+  interrupt-names:
+    description: Specifies the interrupt names for nvmem devices used
+      by AMOLED ECM.
+    minItems: 1
+    items:
+      - const: ecm-sdam0
+      - const: ecm-sdam1
+    $ref: /schemas/types.yaml#/definitions/string-array
+
+required:
+  - compatible
+  - reg
+  - nvmem-names
+  - nvmem
+  - interrupt-names
+  - interrupts
+
+examples:
+  - |
+    qcom,amoled-ecm@f900 {
+        compatible = "qcom,amoled-ecm";
+        reg = <0xf900>;
+        nvmem-names = "amoled-ecm-sdam0", "amoled-ecm-sdam1";
+        nvmem = <&pmk8350_sdam_13>, <&pmk8350_sdam_14>;
+        interrupt-names = "ecm-sdam0", "ecm-sdam1";
+        interrupts = <0x0 0x7c 0x1 IRQ_TYPE_EDGE_RISING>,
+                     <0x0 0x7d 0x1 IRQ_TYPE_EDGE_RISING>;
+    };