linux-kernel - Re: [PATCH v1 1/2] dt-bindings: iio: adc: Add binding for Nuvoton NCT720x ADCs

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Message-ID: <6c20875c-4145-4c91-b3b5-8f70ecb126f0@amperemail.onmicrosoft.com>
Date: Wed, 6 Nov 2024 11:58:06 +0700
From: Chanh Nguyen <chanh@...eremail.onmicrosoft.com>
To: Eason Yang <j2anfernee@...il.com>, avifishman70@...il.com,
 tmaimon77@...il.com, tali.perry1@...il.com, venture@...gle.com,
 yuenn@...gle.com, benjaminfair@...gle.com, jic23@...nel.org,
 lars@...afoo.de, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 nuno.sa@...log.com, dlechner@...libre.com, javier.carrasco.cruz@...il.com,
 andy@...nel.org, marcelo.schmitt@...log.com, olivier.moysan@...s.st.com,
 mitrutzceclan@...il.com, matteomartelli3@...il.com, alisadariana@...il.com,
 joao.goncalves@...adex.com, marius.cristea@...rochip.com,
 mike.looijmans@...ic.nl, chanh@...amperecomputing.com, KWLIU@...oton.com,
 yhyang2@...oton.com
Cc: openbmc@...ts.ozlabs.org, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: iio: adc: Add binding for Nuvoton
 NCT720x ADCs



On 06/11/2024 09:39, Eason Yang wrote:
> This adds a binding specification for the Nuvoton NCT7201/NCT7202
> family of ADCs.
> 
> Signed-off-by: Eason Yang <j2anfernee@...il.com>
> ---
>   .../bindings/iio/adc/nuvoton,nct720x.yaml     | 47 +++++++++++++++++++
>   MAINTAINERS                                   |  1 +
>   2 files changed, 48 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml b/Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml
> new file mode 100644
> index 000000000000..3052039af10e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/nuvoton,nct720x.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nuvoton nct7202 and similar ADCs
> +
> +maintainers:
> +  - Eason Yang <yhyang2@...oton.com>
> +
> +description: |
> +   Family of ADCs with i2c interface.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - nuvoton,nct7201
> +      - nuvoton,nct7202
> +
> +  reg:
> +    maxItems: 1
> +
> +  read-vin-data-size:

Is it generic property or vendor property? I tried to find in the
https://github.com/torvalds/linux/tree/master/Documentation/devicetree/bindings 
, but it seems this property hasn't been used on other devices.

If it is vendor property, then I think it should include a vendor 
prefix. For examples:

https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/iio/adc/adi%2Cad7780.yaml#L50
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/iio/adc/fsl%2Cvf610-adc.yaml#L42
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/iio/adc/st%2Cstmpe-adc.yaml#L22


> +    description: number of data bits per read vin
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [8, 16]
> +
> +required:
> +  - compatible
> +  - reg
> +  - read-vin-data-size
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        nct7202@1d {

I think the Node name should follow 
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation 


For some examples that were merged before

https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/iio/adc/adi%2Cad7091r5.yaml#L102
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/iio/adc/maxim%2Cmax1238.yaml#L73
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/iio/adc/ti%2Cadc081c.yaml#L49

> +            compatible = "nuvoton,nct7202";
> +            reg = <0x1d>;
> +            read-vin-data-size = <8>;
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 91d0609db61b..68570c58e7aa 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2746,6 +2746,7 @@ L:	openbmc@...ts.ozlabs.org (moderated for non-subscribers)
>   S:	Supported
>   F:	Documentation/devicetree/bindings/*/*/*npcm*
>   F:	Documentation/devicetree/bindings/*/*npcm*
> +F:	Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml
>   F:	Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml
>   F:	arch/arm/boot/dts/nuvoton/nuvoton-npcm*
>   F:	arch/arm/mach-npcm/