linux-kernel - Re: [PATCH v1 3/3] dt-bindings: iio: adc: add ADS7924

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Message-ID: <20221223145013.68f7344a@jic23-huawei>
Date:   Fri, 23 Dec 2022 14:50:13 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     hvilleneuve@...onoff.com, lars@...afoo.de, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/3] dt-bindings: iio: adc: add ADS7924

On Thu, 22 Dec 2022 15:36:10 -0500
Hugo Villeneuve <hugo@...ovil.com> wrote:

> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> 
> Add device tree bindings document for the Texas Instruments ADS7924
> ADC.
> 
> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>

Hi Hugo,

Whilst you aren't using it yet, the binding should still attempt to be
a full description of the hardware, so I'd expect the interrupt line to
be part of it.

Otherwise, Krzysztof already covered this in detail.

Jonathan


> ---
>  .../bindings/iio/adc/ti,ads7924.yaml          | 103 ++++++++++++++++++
>  1 file changed, 103 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads7924.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads7924.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads7924.yaml
> new file mode 100644
> index 000000000000..5408ec95e417
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/ti,ads7924.yaml
> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/ti,ads7924.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI ADS7924 4 channels 12 bits I2C analog to digital converter
> +
> +maintainers:
> +  - Hugo Villeneuve <hvilleneuve@...onoff.com>
> +
> +description: |
> +  Texas Instruments ADS7924 4 channels 12 bits I2C analog to digital converter
> +
> +  Specifications:
> +    https://www.ti.com/lit/gpn/ads7924
> +
> +properties:
> +  compatible:
> +    const: ti,ads7924
> +
> +  vref-supply:
> +    description:
> +      The regulator supply for the ADC reference voltage (AVDD)
> +
> +  reg:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    description:
> +      GPIO used for controlling the reset pin
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  "#io-channel-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - vref-supply
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +additionalProperties: false
> +
> +patternProperties:
> +  "^channel@[0-3]+$":
> +    type: object
> +    description:
> +      Child nodes needed for each channel that the platform uses.
> +
> +    properties:
> +      reg:
> +        description: |
> +          0: Voltage over AIN0 and GND.
> +          1: Voltage over AIN1 and GND.
> +          2: Voltage over AIN2 and GND.
> +          3: Voltage over AIN3 and GND.
> +        items:
> +          - minimum: 0
> +            maximum: 3
> +
> +    required:
> +      - reg
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@48 {
> +            compatible = "ti,ads7924";
> +            reg = <0x48>;
> +            vref-supply = <&ads7924_reg>;
> +            reset-gpios = <&gpio 5 GPIO_ACTIVE_LOW>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            channel@0 {
> +              reg = <0>;
> +              label = "CH0";
> +            };
> +            channel@1 {
> +              reg = <1>;
> +              label = "CH1";
> +            };
> +            channel@2 {
> +              reg = <2>;
> +              label = "CH2";
> +            };
> +            channel@3 {
> +              reg = <3>;
> +              label = "CH3";
> +            };
> +        };
> +    };
> +...