102 lines
3.1 KiB
YAML
102 lines
3.1 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/hwmon/adi,ltc2947.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Analog Devices LTC2947 high precision power and energy monitor
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maintainers:
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- Nuno Sá <nuno.sa@analog.com>
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description: |
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Analog Devices LTC2947 high precision power and energy monitor over SPI or I2C.
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https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2947.pdf
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properties:
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compatible:
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enum:
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- adi,ltc2947
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reg:
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maxItems: 1
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clocks:
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description:
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The LTC2947 uses either a trimmed internal oscillator or an external clock
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as the time base for determining the integration period to represent time,
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charge and energy. When an external clock is used, this property must be
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set accordingly.
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maxItems: 1
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adi,accumulator-ctl-pol:
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description:
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This property controls the polarity of current that is accumulated to
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calculate charge and energy so that, they can be only accumulated for
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positive current for example. Since there are two sets of registers for
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the accumulated values, this entry can also have two items which sets
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energy1/charge1 and energy2/charger2 respectively. Check table 12 of the
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datasheet for more information on the supported options.
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$ref: /schemas/types.yaml#/definitions/uint32-array
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minItems: 2
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maxItems: 2
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items:
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enum: [0, 1, 2, 3]
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default: 0
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adi,accumulation-deadband-microamp:
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description:
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This property controls the Accumulation Dead band which allows to set the
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level of current below which no accumulation takes place.
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maximum: 255
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default: 0
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adi,gpio-out-pol:
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description:
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This property controls the GPIO polarity. Setting it to one makes the GPIO
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active high, setting it to zero makets it active low. When this property
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is present, the GPIO is automatically configured as output and set to
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control a fan as a function of measured temperature.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1]
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default: 0
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adi,gpio-in-accum:
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description:
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When set, this property sets the GPIO as input. It is then used to control
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the accumulation of charge, energy and time. This function can be
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enabled/configured separately for each of the two sets of accumulation
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registers. Check table 13 of the datasheet for more information on the
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supported options. This property cannot be used together with
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adi,gpio-out-pol.
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$ref: /schemas/types.yaml#/definitions/uint32-array
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minItems: 2
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maxItems: 2
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items:
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enum: [0, 1, 2]
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default: 0
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required:
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- compatible
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- reg
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additionalProperties: false
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examples:
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- |
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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ltc2947_spi: ltc2947@0 {
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compatible = "adi,ltc2947";
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reg = <0>;
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/* accumulation takes place always for energ1/charge1. */
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/* accumulation only on positive current for energy2/charge2. */
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adi,accumulator-ctl-pol = <0 1>;
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};
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};
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...
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