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The ROHM BD79105 is a simple, 16-bit, 1-channel ADC with a 'CONVSTART' pin used to start the ADC conversion. Other than the 'CONVSTART', there are 3 supply pins (one used as a reference), analog inputs, ground and communication pins. It's worth noting that the pin somewhat confusingly labeled as 'DIN', is a pin which should be used as a chip-select. The IC does not have any writable registers. The device is designed so that the output pin can, in addition to outputting the data, be used as a 'data-ready'-IRQ. There are cases where the IRQ can't be used (because it is delivered via SPI data-line). Hence, some systems may use a GPIO for polling the data readiness. Add a compatible for the bd79105 and add the data-ready GPIO to the binding. Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://patch.msgid.link/3f70f68665225be3091f8a0412e74037b6a2a88e.1754901948.git.mazziesaccount@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
227 lines
5.1 KiB
YAML
227 lines
5.1 KiB
YAML
# 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 <michael.hennerich@analog.com>
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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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oneOf:
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- items:
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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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- rohm,bd79105
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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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- items:
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- const: rohm,bu79100g
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- const: ti,ads7866
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reg:
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maxItems: 1
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interrupts:
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description:
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The data-ready interrupt. Provided via DOUT pin.
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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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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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rdy-gpios:
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description: A GPIO for detecting the data-ready.
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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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allOf:
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- $ref: /schemas/spi/spi-peripheral-props.yaml#
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# Devices with an IRQ
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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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- rohm,bd79105
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then:
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properties:
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interrupts: true
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else:
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properties:
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interrupts: false
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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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then:
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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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not:
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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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- rohm,bd79105
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then:
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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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- rohm,bd79105
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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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not:
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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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- rohm,bd79105
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then:
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properties:
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vdrive-supply: false
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# Devices which support polling the data-ready via GPIO
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- if:
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not:
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properties:
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compatible:
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contains:
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enum:
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- rohm,bd79105
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then:
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properties:
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rdy-gpios: false
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- if:
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not:
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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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- rohm,bd79105
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then:
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properties:
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adi,conversion-start-gpios: false
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# Devices with a convstart GPIO 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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- rohm,bd79105
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then:
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required:
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- adi,conversion-start-gpios
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unevaluatedProperties: 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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