adi,ltc2947.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/hwmon/adi,ltc2947.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Analog Devices LTC2947 high precision power and energy monitor
    8 
    9 maintainers:
   10   - Nuno Sá <nuno.sa@analog.com>
   11 
   12 description: |
   13   Analog Devices LTC2947 high precision power and energy monitor over SPI or I2C.
   14 
   15   https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2947.pdf
   16 
   17 properties:
   18   compatible:
   19     enum:
   20       - adi,ltc2947
   21 
   22   reg:
   23     maxItems: 1
   24 
   25   clocks:
   26     description:
   27       The LTC2947 uses either a trimmed internal oscillator or an external clock
   28       as the time base for determining the integration period to represent time,
   29       charge and energy. When an external clock is used, this property must be
   30       set accordingly.
   31     maxItems: 1
   32 
   33   adi,accumulator-ctl-pol:
   34     description:
   35       This property controls the polarity of current that is accumulated to
   36       calculate charge and energy so that, they can be only accumulated for
   37       positive current for example. Since there are two sets of registers for
   38       the accumulated values, this entry can also have two items which sets
   39       energy1/charge1 and energy2/charger2 respectively. Check table 12 of the
   40       datasheet for more information on the supported options.
   41     $ref: /schemas/types.yaml#/definitions/uint32-array
   42     minItems: 2
   43     maxItems: 2
   44     items:
   45       enum: [0, 1, 2, 3]
   46       default: 0
   47 
   48   adi,accumulation-deadband-microamp:
   49     description:
   50       This property controls the Accumulation Dead band which allows to set the
   51       level of current below which no accumulation takes place.
   52     maximum: 255
   53     default: 0
   54 
   55   adi,gpio-out-pol:
   56     description:
   57       This property controls the GPIO polarity. Setting it to one makes the GPIO
   58       active high, setting it to zero makets it active low. When this property
   59       is present, the GPIO is automatically configured as output and set to
   60       control a fan as a function of measured temperature.
   61     $ref: /schemas/types.yaml#/definitions/uint32
   62     enum: [0, 1]
   63     default: 0
   64 
   65   adi,gpio-in-accum:
   66     description:
   67       When set, this property sets the GPIO as input. It is then used to control
   68       the accumulation of charge, energy and time. This function can be
   69       enabled/configured separately for each of the two sets of accumulation
   70       registers. Check table 13 of the datasheet for more information on the
   71       supported options. This property cannot be used together with
   72       adi,gpio-out-pol.
   73     $ref: /schemas/types.yaml#/definitions/uint32-array
   74     minItems: 2
   75     maxItems: 2
   76     items:
   77       enum: [0, 1, 2]
   78       default: 0
   79 
   80 required:
   81   - compatible
   82   - reg
   83 
   84 
   85 additionalProperties: false
   86 
   87 examples:
   88   - |
   89     spi {
   90            #address-cells = <1>;
   91            #size-cells = <0>;
   92 
   93            ltc2947_spi: ltc2947@0 {
   94                    compatible = "adi,ltc2947";
   95                    reg = <0>;
   96                    /* accumulation takes place always for energ1/charge1. */
   97                    /* accumulation only on positive current for energy2/charge2. */
   98                    adi,accumulator-ctl-pol = <0 1>;
   99            };
  100     };
  101 ...

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