linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: adc: add TI LMP92064 controller

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Date:   Tue, 1 Nov 2022 07:28:24 -0500
From:   Rob Herring <robh@...nel.org>
To:     Leonard Göhrs <l.goehrs@...gutronix.de>
Cc:     kernel@...gutronix.de, Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: iio: adc: add TI LMP92064 controller

On Tue, Nov 01, 2022 at 07:48:03AM +0100, Leonard Göhrs wrote:
> Add binding documentation for the TI LMP92064 dual channel SPI ADC.
> 
> Changes from v1 -> v2:
> 
>  - Rename the "shunt-resistor" devicetree property to
>    "shunt-resistor-micro-ohms".
>  - Add supply regulator support for the two voltage domains of the chip
>    (vdd and vdig).
>  - Add reference to spi-peripheral-props.yaml
> 
> Signed-off-by: Leonard Göhrs <l.goehrs@...gutronix.de>
> ---
>  .../bindings/iio/adc/ti,lmp92064.yaml         | 70 +++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,lmp92064.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/ti,lmp92064.yaml b/Documentation/devicetree/bindings/iio/adc/ti,lmp92064.yaml
> new file mode 100644
> index 000000000000..357b15ebd897
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/ti,lmp92064.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/ti,lmp92064.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Texas Instruments LMP92064 Precision Current and Voltage Sensor.
> +
> +maintainers:
> +  - Leonard Göhrs <l.goehrs@...gutronix.de>
> +
> +description: |
> +  The LMP92064 is a two channel ADC intended for combined voltage and current
> +  measurements.
> +
> +  The device contains two ADCs to allow simultaneous sampling of voltage and
> +  current and thus of instantaneous power consumption.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,lmp92064
> +
> +  reg:
> +    maxItems: 1
> +
> +  vdd-supply:
> +    description: Regulator that provides power to the main part of the chip
> +
> +  vdig-supply:
> +    description: |
> +      Regulator that provides power to the digital I/O part of the chip
> +
> +  shunt-resistor-micro-ohms:
> +    description: |
> +      Value of the shunt resistor (in µΩ) connected between INCP and INCN,
> +      across which current is measured. Used to provide correct scaling of the
> +      raw ADC measurement.
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - shunt-resistor-micro-ohms
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +additionalProperties: false

This should be unevaluatedProperties instead.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@0 {
> +            compatible = "ti,lmp92064";
> +            reg = <0>;
> +            vdd-supply = <&vdd>;
> +            vdig-supply = <&vdd>;
> +            spi-max-frequency = <20000000>;
> +            shunt-resistor-micro-ohms = <15000>;
> +            reset-gpios = <&gpio1 16 GPIO_ACTIVE_HIGH>;
> +        };
> +    };
> +...
> -- 
> 2.30.2
> 
>