[GSoC 2024] Add support for AD7294 #2578
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| # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) | ||
| %YAML 1.2 | ||
| --- | ||
| $id: http://devicetree.org/schemas/iio/addac/adi,ad7294.yaml# | ||
| $schema: http://devicetree.org/meta-schemas/core.yaml# | ||
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| title: Analog Device AD7294/AD7294-2 device | ||
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| maintainers: | ||
| - Anshul Dalal <[email protected]> | ||
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| description: | | ||
| The AD7294/AD7294-2 is a monitor and control system with multichannel | ||
| ADC, DAC, temperature and current sensor. The device features a 12-bit ADC | ||
| and DAC with an i2c interface. | ||
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| Datasheet: | ||
| AD7294: https://www.analog.com/media/en/technical-documentation/data-sheets/AD7294.pdf | ||
| AD7294-2: https://www.analog.com/media/en/technical-documentation/data-sheets/AD7294-2.pdf | ||
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| properties: | ||
| compatible: | ||
| enum: | ||
| - adi,ad7294 | ||
| - adi,ad7294-2 | ||
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| reg: | ||
| maxItems: 1 | ||
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| interrupts: | ||
| maxItems: 1 | ||
| description: Alert interrupt | ||
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| adc-vref-supply: | ||
| description: The regulator supply for ADC reference voltage (0.1V to 4.1V). | ||
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| dac-vref-supply: | ||
| description: | | ||
| The regulator supply for DAC reference voltage (0V to AVDD - 2V). | ||
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| avdd-supply: | ||
| description: Fixed regulator supply for analog circuitry (4.5V to 5.5V). | ||
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| vdrive-supply: | ||
| description: Logic power supply (2.7V to 5.5V). | ||
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| shunt-resistor-ohms: | ||
| $ref: /schemas/types.yaml#/definitions/int32-array | ||
| maxItems: 2 | ||
| description: Resistance for RS1 and RS2 in ohms | ||
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There was a problem hiding this comment. nit: usually we see the description coming before maxItems. would look more natural. |
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| required: | ||
| - compatible | ||
| - reg | ||
| - avdd-supply | ||
| - vdrive-supply | ||
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There was a problem hiding this comment. This would be added here to the device tree doc for documenting the channels if/when implementing support for differential channels |
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| additionalProperties: false | ||
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| examples: | ||
| - | | ||
| #include <dt-bindings/interrupt-controller/irq.h> | ||
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| i2c { | ||
| #address-cells = <1>; | ||
| #size-cells = <0>; | ||
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| ad7294: addac@7b { | ||
| compatible = "adi,ad7294"; | ||
| reg = <0x7b>; | ||
| interrupt-parent = <&gpio>; | ||
| interrupts = <26 IRQ_TYPE_LEVEL_LOW>; | ||
| adc-vref-supply = <&adc_vref>; | ||
| dac-vref-supply = <&dac_vref>; | ||
| avdd-supply = <&avdd>; | ||
| vdrive-supply = <&vdrive>; | ||
| shunt-resistor-ohms = <1000 1000>; | ||
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There was a problem hiding this comment. This would come in the example |
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| }; | ||
| }; | ||
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| // SPDX-License-Identifier: GPL-2.0 | ||
| /dts-v1/; | ||
| /plugin/; | ||
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| #include <dt-bindings/gpio/gpio.h> | ||
| #include <dt-bindings/interrupt-controller/irq.h> | ||
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| / { | ||
| compatible = "brcm,bcm2835"; | ||
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| fragment@0 { | ||
| target-path = "/"; | ||
| __overlay__ { | ||
| avdd: fixedregulator@0 { | ||
| compatible = "regulator-fixed"; | ||
| regulator-name = "avdd"; | ||
| regulator-min-microvolt = <5000000>; | ||
| regulator-max-microvolt = <5000000>; | ||
| regulator-boot-on; | ||
| }; | ||
| vdrive: fixedregulator@1 { | ||
| compatible = "regulator-fixed"; | ||
| regulator-name = "vdrive"; | ||
| regulator-min-microvolt = <3300000>; | ||
| regulator-max-microvolt = <3300000>; | ||
| regulator-boot-on; | ||
| }; | ||
| adc_vref: fixedregulator@2 { | ||
| compatible = "regulator-fixed"; | ||
| regulator-name = "adc-vref"; | ||
| regulator-min-microvolt = <2500000>; | ||
| regulator-max-microvolt = <2500000>; | ||
| regulator-boot-on; | ||
| }; | ||
| dac_vref: fixedregulator@3 { | ||
| compatible = "regulator-fixed"; | ||
| regulator-name = "dac-vref"; | ||
| regulator-min-microvolt = <2500000>; | ||
| regulator-max-microvolt = <2500000>; | ||
| regulator-boot-on; | ||
| }; | ||
| }; | ||
| }; | ||
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| fragment@1 { | ||
| target = <&i2c_arm>; | ||
| __overlay__ { | ||
| #address-cells = <1>; | ||
| #size-cells = <0>; | ||
| status = "okay"; | ||
| ad7294: ad7294@62 { | ||
| compatible = "adi,ad7294-2"; | ||
| reg = <0x62>; | ||
| interrupts = <4 IRQ_TYPE_EDGE_FALLING>; | ||
| interrupt-parent = <&gpio>; | ||
| shunt-resistor-ohms = <1000 1000>; | ||
| adc-vref-supply = <&adc_vref>; | ||
| dac-vref-supply = <&dac_vref>; | ||
| avdd-supply = <&avdd>; | ||
| vdrive-supply = <&vdrive>; | ||
| }; | ||
| }; | ||
| }; | ||
| }; |
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improve the description with:
Interrupt for signaling when conversion results (either voltage, current, or temperature) exceed their high limit or fall below the low limit on a channel basis configuration. The interrupt source must be attached to the ALERT/BUSY pin.