dt-bindings: qpnp-qg: Add DT binding for qpnp-qg device

Add DT binding documentation for qpnp-qg Qguage device.

Change-Id: I5b68e4b12f86bc2953d1369ff51d28aed26752b9
Signed-off-by: Aryan Modi <quic_aryamodi@quicinc.com>

bindings/power/supply/qcom/qpnp-qg.yaml

@@ -0,0 +1,187 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/supply/qcom/qpnp-qg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. QPNP PMIC QGAUGE (QG) Device
+
+maintainers:
+  - Rakesh Kota <quic_kotarake@quicinc.com>
+  - Jishnu Prakash <quic_jprakash@quicinc.com>
+  - Kamal Wadhwa <quic_kamalw@quicinc.com>
+
+description: |
+  QPNP PMIC QGAUGE device provides the ability to gauge the State-of-Charge
+  of the battery. It provides an interface to the clients to read various
+  battery related parameters.
+
+  Required Node Structure: |
+  Qgauge device must be described in two level of nodes. The first level
+  describes the properties of the Qgauge device and the second level
+  describes the peripherals managed/used of the module.
+
+properties:
+  compatible:
+    enum:
+      - qcom,pm6150-qg
+      - qcom,qpnp-qg-lite
+      - qcom,pmi632-qg
+      - qcom,pm7250b-qg
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  "#io-channel-cells":
+    const: 1
+
+  qcom,vbatt-cutoff-mv:
+    description: |
+      The battery voltage threshold (in mV) at which the
+      the Qgauge algorithm converges to 0 SOC. If not specified
+      the default value is 3400 mV.
+
+  qcom,vbatt-low-mv:
+    description: |
+      The battery voltage threshold (in mV) at which the
+      the VBAT_LOW interrupt fires. Software can take necessary
+      the action when this interrupt fires. If not specified
+      the default value is 3500 mV.
+
+  qcom,vbatt-low-cold-mv:
+    description: |
+      The battery voltage threshold (in mV) at which the
+      the VBAT_LOW interrupt fires. The threshold is only
+      applied at cold temperature specified by
+      'qcom,cold-temp-threshold'. Software can take necessary
+      the action when this interrupt fires. If not specified
+      the default value is 3800 mV.
+
+  qcom,vbatt-empty-mv:
+    description: |
+      The battery voltage threshold (in mV) at which the
+      vbatt-empty interrupt fires. The SOC is forced to 0
+      when this interrupt fires. If not specified, the
+      default value is 3200 mV.
+
+  qcom,vbatt-empty-cold-mv:
+    description: |
+      The battery voltage threshold (in mV) at which the
+      vbatt-empty interrupt fires. This threshold is only
+      applied at cold temperature specified by
+      'qcom,cold-temp-threshold'. The SOC is forced to 0
+      when this interrupt fires. If not specified, the
+      default value is 3000 mV.
+
+  qcom,s3-entry-fifo-length:
+    description: |
+      The minimum number if FIFO samples which have to qualify the
+      S3 IBAT entry threshold (qcom,s3-entry-ibat-ua) for QG
+      to enter into S3 state.
+      Minimum Value = 1 Maximum Value = 8. The hardware default
+      is configured to 3.
+
+  io-channels:
+    description: |
+      IIO channel specifiers for each name in io-channel-names.
+
+  io-channel-names:
+    description: |
+      Names of the IIO channels that are used by QG device.
+
+additionalProperties: false
+
+required:
+  - compatible
+  - io-channels
+  - io-channel-names
+
+patternProperties:
+  "^qcom,qgauge@[0-9a-f].*$":
+    type: object
+
+    properties:
+      reg:
+        description: Addresses and sizes for the specified peripheral.
+
+      interrupts:
+        description: Interrupt mapping as per the interrupt encoding.
+
+      interrupt-names:
+        description: |
+          Interrupt names.  This list must match up 1-to-1 with the
+          interrupts specified in the 'interrupts' property.
+
+    required:
+      - reg
+      - interrupts
+      - interrupt-names
+
+    additionalProperties: false
+
+  "^qcom,qg-sdam@[0-9a-f].*$":
+    type: object
+
+    properties:
+      reg:
+        description: Addresses and sizes for the specified peripheral.
+
+    required:
+      - reg
+
+    additionalProperties: false
+
+examples:
+  - |
+    qpnp,qg {
+      compatible = "qcom,pm6150-qg";
+      depends-on-supply = <&pm6150_vadc>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+      #io-channel-cells = <1>;
+
+      qcom,vbatt-cutoff-mv = <3200>;
+      qcom,vbatt-low-mv = <3300>;
+      qcom,vbatt-low-cold-mv = <3700>;
+      qcom,vbatt-empty-mv = <3000>;
+      qcom,vbatt-empty-cold-mv = <3000>;
+      qcom,s3-entry-fifo-length = <2>;
+
+      io-channels = <&pm6150_vadc ADC5_BAT_THERM_100K_PU>,
+        <&pm6150_vadc ADC5_BAT_ID_100K_PU>,
+        <&pm6150_charger PSY_IIO_INPUT_CURRENT_LIMITED>,
+        <&pm6150_charger PSY_IIO_RECHARGE_SOC>,
+        <&pm6150_charger PSY_IIO_FORCE_RECHARGE>,
+        <&pm6150_charger PSY_IIO_CHARGE_DONE>;
+      io-channel-names = "batt-therm",
+        "batt-id",
+        "input_current_limited",
+        "recharge_soc",
+        "force_recharge",
+        "charge_done";
+
+      qcom,qgauge@4800 {
+        status = "okay";
+        reg = <0x4800>;
+        interrupts =
+          <0x0 0x48 0x0 IRQ_TYPE_EDGE_BOTH>,
+          <0x0 0x48 0x1 IRQ_TYPE_EDGE_BOTH>,
+          <0x0 0x48 0x2 IRQ_TYPE_EDGE_RISING>,
+          <0x0 0x48 0x3 IRQ_TYPE_EDGE_RISING>,
+          <0x0 0x48 0x4 IRQ_TYPE_EDGE_RISING>;
+        interrupt-names = "qg-batt-missing",
+          "qg-vbat-low",
+          "qg-vbat-empty",
+          "qg-fifo-done",
+          "qg-good-ocv";
+      };
+
+      qcom,qg-sdam@b600 {
+        status = "okay";
+        reg = <0xb600>;
+      };
+    };
+...