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174 lines
3.8 KiB
174 lines
3.8 KiB
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
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# Copyright 2019 Analog Devices Inc. |
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%YAML 1.2 |
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--- |
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$id: http://devicetree.org/schemas/iio/adc/adi,ad7476.yaml# |
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$schema: http://devicetree.org/meta-schemas/core.yaml# |
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title: AD7476 and similar simple SPI ADCs from multiple manufacturers. |
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maintainers: |
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- Michael Hennerich <[email protected]> |
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description: | |
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A lot of simple SPI ADCs have very straight forward interfaces. |
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They typically don't provide a MOSI pin, simply reading out data |
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on MISO when the clock toggles. |
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properties: |
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compatible: |
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enum: |
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- adi,ad7091 |
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- adi,ad7091r |
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- adi,ad7273 |
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- adi,ad7274 |
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- adi,ad7276 |
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- adi,ad7277 |
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- adi,ad7278 |
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- adi,ad7466 |
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- adi,ad7467 |
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- adi,ad7468 |
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- adi,ad7475 |
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- adi,ad7476 |
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- adi,ad7476a |
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- adi,ad7477 |
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- adi,ad7477a |
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- adi,ad7478 |
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- adi,ad7478a |
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- adi,ad7495 |
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- adi,ad7910 |
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- adi,ad7920 |
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- adi,ad7940 |
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- ti,adc081s |
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- ti,adc101s |
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- ti,adc121s |
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- ti,ads7866 |
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- ti,ads7867 |
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- ti,ads7868 |
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- lltc,ltc2314-14 |
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reg: |
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maxItems: 1 |
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vcc-supply: |
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description: |
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Main powersupply voltage for the chips, sometimes referred to as VDD on |
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datasheets. If there is no separate vref-supply, then this is needed |
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to establish channel scaling. |
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vdrive-supply: |
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description: |
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Some devices have separate supply for their digital control side. |
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vref-supply: |
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description: |
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Some devices have a specific reference voltage supplied on a different pin |
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to the other supplies. Needed to be able to establish channel scaling |
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unless there is also an internal reference available (e.g. ad7091r) |
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spi-max-frequency: true |
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adi,conversion-start-gpios: |
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description: A GPIO used to trigger the start of a conversion |
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maxItems: 1 |
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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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allOf: |
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# Devices where reference is vcc |
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- if: |
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properties: |
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compatible: |
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contains: |
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enum: |
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- adi,ad7091 |
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- adi,ad7276 |
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- adi,ad7277 |
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- adi,ad7278 |
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- adi,ad7466 |
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- adi,ad7467 |
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- adi,ad7468 |
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- adi,ad7940 |
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- ti,adc081s |
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- ti,adc101s |
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- ti,adc121s |
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- ti,ads7866 |
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- ti,ads7868 |
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required: |
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- vcc-supply |
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# Devices with a vref |
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- if: |
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properties: |
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compatible: |
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contains: |
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enum: |
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- adi,ad7091r |
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- adi,ad7273 |
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- adi,ad7274 |
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- adi,ad7475 |
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- lltc,ltc2314-14 |
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then: |
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properties: |
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vref-supply: true |
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else: |
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properties: |
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vref-supply: false |
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# Devices with a vref where it is not optional |
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- if: |
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properties: |
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compatible: |
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contains: |
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enum: |
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- adi,ad7273 |
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- adi,ad7274 |
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- adi,ad7475 |
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- lltc,ltc2314-14 |
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then: |
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required: |
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- vref-supply |
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- if: |
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properties: |
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compatible: |
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contains: |
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enum: |
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- adi,ad7475 |
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- adi,ad7495 |
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then: |
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properties: |
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vdrive-supply: true |
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else: |
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properties: |
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vdrive-supply: false |
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- if: |
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properties: |
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compatible: |
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contains: |
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enum: |
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- adi,ad7091 |
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- adi,ad7091r |
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then: |
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properties: |
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adi,conversion-start-gpios: true |
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else: |
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properties: |
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adi,conversion-start-gpios: 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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adc@0 { |
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compatible = "adi,ad7091r"; |
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reg = <0>; |
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spi-max-frequency = <5000000>; |
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vcc-supply = <&adc_vcc>; |
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vref-supply = <&adc_vref>; |
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}; |
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}; |
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...
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