linux-kernel - Re: [PATCH v4 1/2] dt-bindings: iio: adc: adding support for PAC193X

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Message-ID: <20240122-fernlike-resolute-b16772806147@spud>
Date: Mon, 22 Jan 2024 18:15:07 +0000
From: Conor Dooley <conor@...nel.org>
To: marius.cristea@...rochip.com
Cc: jic23@...nel.org, lars@...afoo.de, robh+dt@...nel.org,
	jdelvare@...e.com, linux@...ck-us.net, linux-hwmon@...r.kernel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] dt-bindings: iio: adc: adding support for PAC193X

Hey Marius,

On Mon, Jan 22, 2024 at 10:47:11AM +0200, marius.cristea@...rochip.com wrote:
> From: Marius Cristea <marius.cristea@...rochip.com>
> 
> This is the device tree schema for iio driver for
> Microchip PAC193X series of Power Monitors with Accumulator.
> 
> Signed-off-by: Marius Cristea <marius.cristea@...rochip.com>

I like how this is looking now. I have two minor comments that if you
resend for some other reason you could change, but otherwise:
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

> ---
>  .../bindings/iio/adc/microchip,pac1934.yaml   | 120 ++++++++++++++++++
>  1 file changed, 120 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml
> new file mode 100644
> index 000000000000..cd9cb2a71566
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/microchip,pac1934.yaml
> @@ -0,0 +1,120 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/microchip,pac1934.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip PAC1934 Power Monitors with Accumulator
> +
> +maintainers:
> +  - Marius Cristea <marius.cristea@...rochip.com>
> +
> +description: |
> +  This device is part of the Microchip family of Power Monitors with
> +  Accumulator.
> +  The datasheet for PAC1931, PAC1932, PAC1933 and PAC1934 can be found here:
> +    https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/PAC1931-Family-Data-Sheet-DS20005850E.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,pac1931
> +      - microchip,pac1932
> +      - microchip,pac1933
> +      - microchip,pac1934
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  slow-io-gpios:
> +    description: |

This...

> +      A GPIO used to trigger a change is sampling rate (lowering the chip power
> +      consumption). If configured in SLOW mode, if this pin is forced high,
> +      sampling rate is forced to eight samples/second. When it is forced low,
> +      the sampling rate is 1024 samples/second unless a different sample rate
> +      has been programmed.
> +
> +patternProperties:
> +  "^channel@[1-4]+$":
> +    type: object
> +    $ref: adc.yaml
> +    description: |

...and this...

> +        Represents the external channels which are connected to the ADC.
> +
> +    properties:
> +      reg:
> +        items:
> +          minimum: 1
> +          maximum: 4
> +
> +      shunt-resistor-micro-ohms:
> +        description: |

...and this | are not needed here as you have no formatting to preserve.

> +          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.
> +
> +    required:
> +      - reg
> +      - shunt-resistor-micro-ohms
> +
> +    unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        pac193x: power-monitor@10 {

This "pac193x" label is not used and should be removed.

Thanks,
Conor.

> +            compatible = "microchip,pac1934";
> +            reg = <0x10>;
> +
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            channel@1 {
> +                reg = <0x1>;
> +                shunt-resistor-micro-ohms = <24900000>;
> +                label = "CPU";
> +            };
> +
> +            channel@2 {
> +                reg = <0x2>;
> +                shunt-resistor-micro-ohms = <49900000>;
> +                label = "GPU";
> +            };
> +
> +            channel@3 {
> +                reg = <0x3>;
> +                shunt-resistor-micro-ohms = <75000000>;
> +                label = "MEM";
> +                bipolar;
> +            };
> +
> +            channel@4 {
> +                reg = <0x4>;
> +                shunt-resistor-micro-ohms = <100000000>;
> +                label = "NET";
> +                bipolar;
> +            };
> +        };
> +    };
> +
> +...
> -- 
> 2.34.1
> 

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