linux-kernel - Re: [PATCH v1 2/3] dt-bindings: iio: adc: add AD7191

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Message-ID: <20241222-sequester-mounted-42c0db97611f@spud>
Date: Sun, 22 Dec 2024 14:48:08 +0000
From: Conor Dooley <conor@...nel.org>
To: Alisa-Dariana Roman <alisadariana@...il.com>
Cc: Alisa-Dariana Roman <alisa.roman@...log.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	David Lechner <dlechner@...libre.com>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH v1 2/3] dt-bindings: iio: adc: add AD7191

On Sat, Dec 21, 2024 at 05:56:01PM +0200, Alisa-Dariana Roman wrote:
> AD7191 is a pin-programmable, ultralow noise 24-bit sigma-delta ADC
> designed for precision bridge sensor measurements. It features two
> differential analog input channels, selectable output rates,
> programmable gain, internal temperature sensor and simultaneous
> 50Hz/60Hz rejection.
> 
> Signed-off-by: Alisa-Dariana Roman <alisa.roman@...log.com>
> ---
>  .../bindings/iio/adc/adi,ad7191.yaml          | 128 ++++++++++++++++++
>  MAINTAINERS                                   |   7 +
>  2 files changed, 135 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml
> new file mode 100644
> index 000000000000..f3e596918c22
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml
> @@ -0,0 +1,128 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2025 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/adi,ad7191.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD7191 ADC device driver
> +
> +maintainers:
> +  - Alisa-Dariana Roman <alisa.roman@...log.com>
> +
> +description: |
> +  Bindings for the Analog Devices AD7191 ADC device. Datasheet can be
> +  found here:
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/AD7191.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad7191
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-cpol: true
> +
> +  spi-cpha: true
> +
> +  clocks:
> +    maxItems: 1
> +    description:
> +      Optionally, either a crystal can be attached externally between MCLK1 and
> +      MCLK2 pins, or an external CMOS-compatible clock can drive the MCLK2
> +      pin. If absent, internal 4.92MHz clock is used.

Without clock-names, how do you tell the difference between driven ctal and
the cmos-compatible clock? That CLKSEL's job?

> +
> +  interrupts:
> +    maxItems: 1
> +
> +  avdd-supply:
> +    description: AVdd voltage supply
> +
> +  dvdd-supply:
> +    description: DVdd voltage supply
> +
> +  vref-supply:
> +    description: Vref voltage supply
> +
> +  odr1-gpios:
> +    description: GPIO connected to ODR1 pin for output data rate selection
> +    maxItems: 1
> +
> +  odr2-gpios:
> +    description: GPIO connected to ODR2 pin for output data rate selection
> +    maxItems: 1
> +
> +  pga1-gpios:
> +    description: GPIO connected to PGA1 pin for gain selection
> +    maxItems: 1
> +
> +  pga2-gpios:
> +    description: GPIO connected to PGA2 pin for gain selection
> +    maxItems: 1
> +
> +  temp-gpios:
> +    description: GPIO connected to TEMP pin for temperature sensor enable
> +    maxItems: 1
> +
> +  chan-gpios:
> +    description: GPIO connected to CHAN pin for input channel selection
> +    maxItems: 1
> +
> +  clksel-gpios:
> +    description: GPIO connected to CLKSEL pin for clock source selection
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - avdd-supply
> +  - dvdd-supply
> +  - vref-supply
> +  - spi-cpol
> +  - spi-cpha

> +  - odr1-gpios
> +  - odr2-gpios
> +  - pga1-gpios
> +  - pga2-gpios

For these 4, since all are required, seems like grouping as odr-pgios
and pga-gpios would be a good idea?

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