Qualcomm Technologies, Inc. Battery Gauge (QBG) binding

description: |
  Qualcomm Technologies, Inc. Battery Gauge (QBG) uses the periodic samples of
  battery voltage and current to determine the battery state-of-charge (SOC)
  and supports other battery management features.

properties:
  compatible:
    const: qcom,qbg

  reg:
    description: Base address of QBG MAIN peripheral.
    maxItems: 1

  interrupts:
    description: Specifies the interrupts for nvmem devices used by QBG.
    maxItems: 1

  interrupt-names:
    description: Specifies the interrupt names for nvmem devices used by QBG.
    minItems: 1
    items:
      - const: qbg-sdam
    $ref: /schemas/types.yaml#/definitions/string-array

  qcom,num-data-sdams:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: Number of SDAMs used for storing QBG FIFO data.

  qcom,sdam-base:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: Base address of QBG SDAM peripheral.

  qcom,vbat-cutoff-mv:
    allOf:
      - $ref: "/schemas/types.yaml#/definitions/uint32"
    description: The battery voltage threshold (in mV) at which the battery
      power cuts off. The SOC is forced to 0 when battery voltage reaches
      this value.
    default: 3100

  qcom,ibat-cutoff-ma:
    allOf:
      - $ref: /schemas/types.yaml#/definitions/uint32
    description: The battery current threshold (in mA) at which the battery
      power cuts off. The SOC is forced to 0 when battery current reaches
      this value.
    default: 150

  qcom,vph-min-mv:
    allOf:
      - $ref: /schemas/types.yaml#/definitions/uint32
    description: Minimum sustainable system power (in mV).
    default: 2700

  qcom,iterm-ma:
    allOf:
      - $ref: /schemas/types.yaml#/definitions/uint32
    description: The battery current (in mA) at which the QBG algorithm
      converges the SOC to 100% during charging and can be used to terminate
      charging.
    default: 100

  qcom,rconn-mohm:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: Resistance of the battery connector in mOhms.

  nvmem-cell-names:
    minItems: 2
    maxItems: 3
    items:
      - const: qbg_debug_mask_low
      - const: qbg_debug_mask_high
      - const: skip_esr_state

  nvmem-cells:
   minItems: 2
   minItems: 3
   description: |
     Use nvmem cell device to indicate SDAM register.
       qbg_debug_mask_low/qbg_debug_mask_high used to store the qbg debug mask
       skip_esr_state used to get GPS de-modulating status

required:
  - compatible
  - reg
  - interrupt-names
  - interrupts
  - qcom,num-data-sdams
  - qcom,sdam-base

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    spmi_bus {
      #address-cells = <2>;
      #size-cells = <0>;
      interrupt-controller;
      #interrupt-cells = <4>;

      qcom,pm5100@0 {
        #address-cells = <1>;
        #size-cells = <0>;

        qbg@4f00 {
          compatible = "qcom,qbg";
          reg = <0x4f00>;
          #address-cells = <1>;
          #size-cells = <1>;
          interrupt-names = "qbg-sdam";
          interrupts = <0x0 0x76 0x1 IRQ_TYPE_EDGE_RISING>;
          qcom,num-data-sdams = <6>;
          qcom,sdam-base = <0x7600>;
          nvmem-cell-names = "qbg_debug_mask_low", "qbg_debug_mask_high";
          nvmem-cells = <&qbg_debug_mask_low>, <&qbg_debug_mask_high>;
        };
      };
    };
...
