linux-kernel - Re: [PATCH v3 1/3] dt-bindings: iio: adc: add binding for pac1921

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Message-ID: <20240722210507.76d82f54@jic23-huawei>
Date: Mon, 22 Jul 2024 21:05:07 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Matteo Martelli <matteomartelli3@...il.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Marius Cristea <marius.cristea@...rochip.com>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] dt-bindings: iio: adc: add binding for pac1921

On Mon, 22 Jul 2024 12:03:18 +0200
Matteo Martelli <matteomartelli3@...il.com> wrote:

> Add binging for Microchip PAC1921 Power/Current monitor
> 
> Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
> Signed-off-by: Matteo Martelli <matteomartelli3@...il.com>
> ---
>  .../bindings/iio/adc/microchip,pac1921.yaml        | 71 ++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,pac1921.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,pac1921.yaml
> new file mode 100644
> index 000000000000..b6f01b79b91d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/microchip,pac1921.yaml
> @@ -0,0 +1,71 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/microchip,pac1921.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip PAC1921 High-Side Power/Current Monitor with Anaog Output
> +
> +maintainers:
> +  - Matteo Martelli <matteomartelli3@...il.com>
> +
> +description: |
> +  The PAC1921 is a power/current monitoring device with an analog output
> +  and I2C/SMBus interface.
> +
> +  Datasheet can be found here:
> +  https://ww1.microchip.com/downloads/en/DeviceDoc/PAC1921-Data-Sheet-DS20005293E.pdf
> +
> +properties:
> +  compatible:
> +    const: microchip,pac1921
> +
> +  reg:
> +    maxItems: 1
> +
> +  vdd-supply: true
> +
> +  "#io-channel-cells":
> +    const: 1
> +
> +  shunt-resistor-micro-ohms:
> +    description:
> +      Value in micro Ohms of the shunt resistor connected between
> +      the SENSE+ and SENSE- inputs, across which the current is measured.
> +      Value is needed to compute the scaling of the measured current.
> +
> +  label:
> +    description: Unique name to identify which device this is.
> +
> +  microchip,read-int-gpios:
Given I agree with Conor about not needing a vendor prefix for gpios
so you'll be respinning anyway:
Would you mind renaming this to longer form: read-integrate-gpios?

I was briefly assuming it was a INTerrupt pin.

> +    description:
> +      READ/INT input pin to control the current state of the device, either in
> +      the INTEGRATE state when driven high, or in the READ state when driven low.
> +      When not connected the pin is floating and it can be overridden by the
> +      INT_EN register bit after asserting the READ/INT_OVR register bit.
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - vdd-supply
> +  - shunt-resistor-micro-ohms
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@4c {
> +            compatible = "microchip,pac1921";
> +            reg = <0x4c>;
> +            vdd-supply = <&vdd>;
> +            #io-channel-cells = <1>;
> +            label = "vbat";
> +            shunt-resistor-micro-ohms = <10000>;
> +        };
> +    };
> +...
>