Bindings/hwmon/adi,ltc2947.yaml

   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 ...