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Message-ID: <7ef3a31a-fa6a-1a54-6e60-ff0c5df28301@linaro.org>
Date: Mon, 3 Oct 2022 12:45:31 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Cosmin Tanislav <demonsingur@...il.com>
Cc: Cosmin Tanislav <cosmin.tanislav@...log.com>,
Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Jonathan Cameron <jic23@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: iio: addac: add AD74115
On 03/10/2022 12:30, Cosmin Tanislav wrote:
> From: Cosmin Tanislav <cosmin.tanislav@...log.com>
>
> The AD74115H is a single-channel, software-configurable, input and
> output device for industrial control applications. The AD74115H
> provides a wide range of use cases, integrated on a single chip.
>
> These use cases include analog output, analog input, digital output,
> digital input, resistance temperature detector (RTD), and thermocouple
> measurement capability. The AD74115H also has an integrated HART modem.
>
> A serial peripheral interface (SPI) is used to handle all communications
> to the device, including communications with the HART modem. The digital
> input and digital outputs can be accessed via the SPI or the
> general-purpose input and output (GPIO) pins to support higher
> speed data rates.
>
> The device features a 16-bit, sigma-delta analog-to-digital converter
> (ADC) and a 14-bit digital-to-analog converter (DAC).
> The AD74115H contains a high accuracy 2.5 V on-chip reference that can
> be used as the DAC and ADC reference.
>
> Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>
I got only this patch. Where is the cover letter?
> ---
> .../bindings/iio/addac/adi,ad74115.yaml | 491 ++++++++++++++++++
> MAINTAINERS | 7 +
> 2 files changed, 498 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/addac/adi,ad74115.yaml
>
> diff --git a/Documentation/devicetree/bindings/iio/addac/adi,ad74115.yaml b/Documentation/devicetree/bindings/iio/addac/adi,ad74115.yaml
> new file mode 100644
> index 000000000000..1f894d80b259
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/addac/adi,ad74115.yaml
Filename matching compatible, so adi,ad74115h.yaml
> @@ -0,0 +1,491 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/addac/adi,ad74115.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD74115H device
> +
> +maintainers:
> + - Cosmin Tanislav <cosmin.tanislav@...log.com>
> +
> +description: |
> + The AD74115H is a single-channel software configurable input/output
> + device for industrial control applications. It contains functionality for
> + analog output, analog input, digital output, digital input, resistance
> + temperature detector, and thermocouple measurements integrated into a single
> + chip solution with an SPI interface. The device features a 16-bit ADC and a
> + 14-bit DAC.
> +
> + https://www.analog.com/en/products/ad74115h.html
> +
Missing allOf-ref to spi properties.
> +properties:
> + compatible:
> + enum:
> + - adi,ad74115h
> +
> + reg:
> + maxItems: 1
> +
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 0
> +
> + spi-max-frequency:
> + maximum: 24000000
> +
> + spi-cpol: true
> +
> + interrupts:
> + maxItems: 1
> +
> + avdd-supply: true
> + avcc-supply: true
> + dvcc-supply: true
> + aldo1v8-supply: true
> + dovdd-supply: true
> + refin-supply: true
> +
> + adi,ch-func:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Channel function.
> + 0 - High impedance
> + 1 - Voltage output
> + 2 - Current output
> + 3 - Voltage input
> + 4 - Current input, externally-powered
> + 5 - Current input, loop-powered
> + 6 - Resistance input
> + 7 - RTD measure
> + 8 - Digital input logic
> + 9 - Digital input, loop-powered
> + 10 - Current output with HART
> + 11 - Current input, externally-powered, with HART
> + 12 - Current input, loop-powered, with HART
> + minimum: 0
> + maximum: 12
> + default: 0
> +
> + adi,conv2-mux:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Input node for ADC conversion 2.
node or mode?
> + 0 - SENSE_EXT1 to AGND_SENSE
> + 1 - SENSE_EXT2 to AGND_SENSE
> + 2 - SENSE_EXT2 to SENSE_EXT1
> + 3 - AGND to AGND
> + minimum: 0
> + maximum: 3
> + default: 0
> +
> + adi,conv2-range:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Conversion range for ADC conversion 2.
> + 0 - 0V to 12V
> + 1 - -12V to +12V
> + 2 - -2.5V to +2.5V
> + 3 - -2.5V to 0V
> + 4 - 0V to 2.5V
> + 5 - 0V to 0.625V
> + 6 - -104mV to +104mV
> + 7 - 0V to 12V
> + minimum: 0
> + maximum: 7
> + default: 0
> +
> + adi,diag0-func:
> + $ref: /schemas/types.yaml#/definitions/uint32
This nicely matches a string enum.
> + description: |
> + Diagnostic channel 0 function.
> + 0 - Disabled
> + 1 - Temperature sensor
> + 2 - DVCC
> + 3 - AVCC
> + 4 - ALDO1V8
> + 5 - DLDO1V8
> + 6 - REFOUT
> + 7 - AVDD
> + 8 - AVSS
> + 9 - LVIN
> + 10 - SENSEL
> + 11 - SENSE_EXT1
> + 12 - SENSE_EXT2
> + 13 - DO_VDD
> + 14 - AGND
> + 15 - Sinking current from external digital output
> + minimum: 0
> + maximum: 15
> + default: 0
> +
> + adi,diag1-func:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
Ditto
> + Diagnostic channel 1 function.
> + 0 - Disabled
> + 1 - Temperature sensor
> + 2 - DVCC
> + 3 - AVCC
> + 4 - ALDO1V8
> + 5 - DLDO1V8
> + 6 - REFOUT
> + 7 - AVDD
> + 8 - AVSS
> + 9 - LVIN
> + 10 - SENSEL
> + 11 - SENSE_EXT1
> + 12 - SENSE_EXT2
> + 13 - DO_VDD
> + 14 - AGND
> + 15 - Sourcing current from external digital output
> + minimum: 0
> + maximum: 15
> + default: 0
> +
> + adi,diag2-func:
> + $ref: /schemas/types.yaml#/definitions/uint32
Ditto
> + description: |
> + Diagnostic channel 2 function.
> + 0 - Disabled
> + 1 - Temperature sensor
> + 2 - DVCC
> + 3 - AVCC
> + 4 - ALDO1V8
> + 5 - DLDO1V8
> + 6 - REFOUT
> + 7 - AVDD
> + 8 - AVSS
> + 9 - LVIN
> + 10 - SENSEL
> + 11 - SENSE_EXT1
> + 12 - SENSE_EXT2
> + 13 - DO_VDD
> + 14 - AGND
> + 15 - Sinking current from internal digital output
> + minimum: 0
> + maximum: 15
> + default: 0
> +
> + adi,diag3-func:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
Ditto
> + Diagnostic channel 3 function.
> + 0 - Disabled
> + 1 - Temperature sensor
> + 2 - DVCC
> + 3 - AVCC
> + 4 - ALDO1V8
> + 5 - DLDO1V8
> + 6 - REFOUT
> + 7 - AVDD
> + 8 - AVSS
> + 9 - LVIN
> + 10 - SENSEL
> + 11 - SENSE_EXT1
> + 12 - SENSE_EXT2
> + 13 - DO_VDD
> + 14 - AGND
> + 15 - Sourcing current from internal digital output
> + minimum: 0
> + maximum: 15
> + default: 0
> +
> + adi,sense-agnd-buffer-lp:
> + type: boolean
> + description: |
> + Whether to enable low-power buffered mode for the AGND sense pin.
> +
> + adi,lf-buffer-lp:
> + type: boolean
> + description: |
> + Whether to enable low-power buffered mode for the low-side filtered
> + sense pin.
> +
> + adi,hf-buffer-lp:
> + type: boolean
> + description: |
> + Whether to enable low-power buffered mode for the high-side filtered
> + sense pin.
> +
> + adi,ext2-buffer-lp:
> + type: boolean
> + description: Whether to enable low-power buffered mode for the EXT2 pin.
> +
> + adi,ext1-buffer-lp:
> + type: boolean
> + description: Whether to enable low-power buffered mode for the EXT1 pin.
> +
> + adi,comparator-invert-en:
Drop "-en" suffix.
> + type: boolean
> + description: Whether to invert the comparator output.
> +
> + adi,digital-input-range:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Digital input range.
> + 0 - Range 0.0 to 3.7mA in steps of 120uA, ~2k series resistance
> + 1 - Range 1.0 to 7.4mA in steps of 240uA, ~1k series resistance
> + minimum: 0
> + maximum: 1
> + default: 0
> +
> + adi,digital-input-sink:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: Digital input sink.
You just copied the name of property into description. It's not useful.
> + minimum: 0
> + maximum: 31
> + default: 0
> +
> + adi,digital-input-debounce-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Digital input debounce mode.
> + 0 - Integrator method is used, a counter increments when the
> + signal is asserted and decrements when the signal is de-asserted
> + 1 - A simple counter increments while a signal is asserted and
> + resets when the signal de-asserts
> + minimum: 0
> + maximum: 1
This also looks like a string.
> + default: 0
> +
> + adi,digital-input-unbuffered:
> + type: boolean
> + description: Whether to buffer digital input signals.
> +
> + adi,digital-input-short-circuit-detection:
> + type: boolean
> + description: Whether to detect digital input short circuits.
> +
> + adi,digital-input-open-circuit-detection:
> + type: boolean
> + description: Whether to detect digital input open circuits.
> +
> + adi,digital-input-threshold-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Digital input threshold mode.
> + 0 - The threshold range is from -0.96 * AVDD to AVDD
> + 1 - The threshold range is fixed from -19V to 30V
> + minimum: 0
> + maximum: 1
> + default: 0
> +
> + adi,dac-bipolar:
> + type: boolean
> + description: |
> + When not present, the DAC operates in the 0V to 12V range.
> + When present, the DAC operates in the -12V to 12V range.
> +
> + adi,charge-pump-en:
> + type: boolean
> + description: Whether to enable the internal charge pump.
> +
> + adi,dac-hart-slew:
> + type: boolean
> + description: Whether to use a HART-compatible slew rate.
> +
> + adi,dac-current-limit:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Current limit.
> + 0 - 32mA source or sink for VOUT, 4mA sink for IOUT
> + 1 - 16mA source or sink for VOUT, 1mA sink for IOUT
Use common property units, so microamp:
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml
> + minimum: 0
> + maximum: 1
> + default: 0
> +
> + adi,rtd-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + RTD mode.
> + 0 - 3-wire mode
> + 1 - 4-wire mode
Looks like a string.
> + minimum: 0
> + maximum: 1
> + default: 0
> +
> + adi,3-wire-rtd-excitation-swap:
> + type: boolean
> + description: Whether to swap the excitation for 3-wire RTD.
> +
> + adi,rtd-excitation-current-microamp:
> + description: Excitation current to apply to RTD.
> + enum: [250, 500, 750, 1000]
> + default: 250
> +
> + adi,ext1-burnout-en:
Drop "-en" suffix
> + type: boolean
> + description: Whether to enable burnout current for EXT1.
> +
> + adi,ext1-burnout-current-nanoamp:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Burnout current in nanoamps to be applied to EXT1.
> + enum: [0, 50, 500, 1000, 10000]
> + default: 0
> +
> + adi,ext1-burnout-current-polarity:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Burnout current polarity for EXT2.
> + 0 - Sinking
> + 1 - Sourcing
> + minimum: 0
> + maximum: 1
> + default: 0
> +
> + adi,ext2-burnout-en:
Drop "-en" suffix
> + type: boolean
> + description: Whether to enable burnout current for EXT2.
> +
> + adi,ext2-burnout-current-nanoamp:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: Burnout current in nanoamps to be applied to EXT2.
> + enum: [0, 50, 500, 1000, 10000]
> + default: 0
> +
> + adi,ext2-burnout-current-polarity:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Burnout current polarity for EXT2.
> + 0 - Sinking
> + 1 - Sourcing
Looks like a string.
> + minimum: 0
> + maximum: 1
> + default: 0
> +
> + adi,viout-burnout-en:
Drop "-en" suffix
> + type: boolean
> + description: Whether to enable burnout current for VIOUT.
> +
> + adi,viout-burnout-current-nanoamp:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: Burnout current in nanoamps to be applied to VIOUT.
> + enum: [0, 1000, 10000]
> + default: 0
> +
> + adi,viout-burnout-current-polarity:
Looks like a string
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Burnout current polarity for VIOUT.
> + 0 - Sinking
> + 1 - Sourcing
> + minimum: 0
> + maximum: 1
> + default: 0
> +
> + adi,gpio0-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + GPIO functions.
> + 0 - Disabled
> + 1 - Logic I/O
> + 2 - Comparator output
> + 3 - Control HART CD
> + 4 - Monitor HART CD
> + 5 - Monitor HART EOM status
Looks like a string
> + minimum: 0
> + maximum: 5
> + default: 0
> +
> + adi,gpio1-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + GPIO functions.
> + 0 - Disabled
> + 1 - Logic I/O
> + 2 - Drive external digital output FET
> + 3 - Control HART RXD
> + 4 - Monitor HART RXD
> + 5 - Monitor HART SOM status
Looks like a string
> + minimum: 0
> + maximum: 5
> + default: 0
> +
> + adi,gpio2-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + GPIO functions.
> + 0 - Disabled
> + 1 - Logic I/O
> + 2 - Drive internal digital output FET
> + 3 - Control HART TXD
> + 4 - Monitor HART TXD
> + 5 - Monitor HART TX complete status
Looks like a string
> + minimum: 0
> + maximum: 5
> + default: 0
> +
> + adi,gpio3-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + GPIO functions.
> + 0 - Disabled
> + 1 - Logic I/O
> + 2 - High impedance
> + 3 - Control HART RTS
> + 4 - Monitor HART RTS
> + 5 - Monitor HART CD complete status
Looks like a string
> + minimum: 0
> + maximum: 5
> + default: 0
> +
> +required:
> + - compatible
> + - reg
> + - spi-cpol
> + - avdd-supply
> +
> +additionalProperties: false
> +
Best regards,
Krzysztof
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