linux-kernel - Re: [PATCH v2 1/5] dt-bindings: ROHM BD79124 ADC/GPO

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Message-ID: <20250205-stalemate-shorthand-5a29fbc4081f@spud>
Date: Wed, 5 Feb 2025 20:03:57 +0000
From: Conor Dooley <conor@...nel.org>
To: Matti Vaittinen <mazziesaccount@...il.com>
Cc: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Nuno Sa <nuno.sa@...log.com>,
	David Lechner <dlechner@...libre.com>, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] dt-bindings: ROHM BD79124 ADC/GPO

On Wed, Feb 05, 2025 at 03:34:29PM +0200, Matti Vaittinen wrote:
> Add binding document for the ROHM BD79124 ADC / GPO.
> 
> ROHM BD79124 is a 8-channel, 12-bit ADC. The input pins can also be used
> as general purpose outputs.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
> ---
> Revision history:
> RFC v1 => v2:
>  - drop MFD and represent directly as ADC
>  - drop pinmux and treat all non ADC channel pins as GPOs
> ---
>  .../bindings/iio/adc/rohm,bd79124.yaml        | 114 ++++++++++++++++++
>  1 file changed, 114 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml b/Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml
> new file mode 100644
> index 000000000000..50889dc6b9a8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml
> @@ -0,0 +1,114 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/rohm,bd79124.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ROHM BD79124 ADC/GPO
> +
> +maintainers:
> +  - Matti Vaittinen <mazziesaccount@...il.com>
> +
> +description: |
> +  The ROHM BD79124 is a 12-bit, 8-channel, SAR ADC. The ADC supports
> +  an automatic measurement mode, with an alarm interrupt for out-of-window
> +  measurements. ADC input pins can be also configured as general purpose
> +  outputs.
> +
> +properties:
> +  compatible:
> +    const: rohm,bd79124
> +
> +  reg:
> +    description:
> +      I2C slave address.
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  gpio-controller: true
> +
> +  "#gpio-cells":
> +    const: 1
> +    description:
> +      The pin number.
> +
> +  vdd-supply: true
> +
> +  iovdd-supply: true
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +patternProperties:
> +  "^channel@[0-9a-f]+$":

You can only have 8 channels, there's no need for this to be so
permissive, right?
Otherwise, this looks good enough to me.

> +    type: object
> +    $ref: /schemas/iio/adc/adc.yaml#
> +    description: Represents ADC channel.
> +
> +    properties:
> +      reg:
> +        description: AIN pin number
> +        minimum: 0
> +        maximum: 7
> +
> +    required:
> +      - reg
> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - iovdd-supply
> +  - vdd-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/leds/common.h>
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        adc: adc@10 {
> +            compatible = "rohm,bd79124";
> +            reg = <0x10>;
> +
> +            interrupt-parent = <&gpio1>;
> +            interrupts = <29 8>;
> +
> +            vdd-supply = <&dummyreg>;
> +            iovdd-supply = <&dummyreg>;
> +
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            channel@0 {
> +                reg = <0>;
> +            };
> +            channel@1 {
> +                reg = <1>;
> +            };
> +            channel@2 {
> +                reg = <2>;
> +            };
> +            channel@3 {
> +                reg = <3>;
> +            };
> +            channel@4 {
> +                reg = <4>;
> +            };
> +            channel@5 {
> +                reg = <5>;
> +            };
> +            channel@6 {
> +                reg = <6>;
> +            };
> +        };
> +    };
> -- 
> 2.48.1
> 



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