linux-kernel - Re: [PATCH v2 2/3] dt-bindings: iio: adc: Add Allwinner D1/T113s/R329/T507 SoCs GPADC

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Message-ID: <fbcc5688-387c-32fb-edac-17848c92b936@linaro.org>
Date:   Fri, 2 Jun 2023 10:38:21 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Maksim Kiselev <bigunclemax@...il.com>, linux-iio@...r.kernel.org
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Cosmin Tanislav <demonsingur@...il.com>,
        Stephen Boyd <sboyd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        William Breathitt Gray <william.gray@...aro.org>,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        Mike Looijmans <mike.looijmans@...ic.nl>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Ramona Bolboaca <ramona.bolboaca@...log.com>,
        Ibrahim Tilki <Ibrahim.Tilki@...log.com>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        ChiaEn Wu <chiaen_wu@...htek.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 2/3] dt-bindings: iio: adc: Add Allwinner
 D1/T113s/R329/T507 SoCs GPADC

On 02/06/2023 00:30, Maksim Kiselev wrote:
> From: Maxim Kiselev <bigunclemax@...il.com>
> 
> Allwinner's D1/T113s/R329/T507 SoCs have a new general purpose ADC.
> This ADC is the same for all of this SoCs. The only difference is
> the number of available channels.

Except that it wasn't tested...

> 
> Signed-off-by: Maxim Kiselev <bigunclemax@...il.com>
> ---
>  .../iio/adc/allwinner,sun20i-d1-gpadc.yaml    | 79 +++++++++++++++++++
>  1 file changed, 79 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml b/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
> new file mode 100644
> index 000000000000..94f15bb48231
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: GPL-2.0

dual license

Please run scripts/checkpatch.pl and fix reported warnings. Some
warnings can be ignored, but the code here looks like it needs a fix.
Feel free to get in touch if the warning is not clear.


> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/allwinner,sun20i-d1-gpadc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Allwinner D1 General Purpose ADC
> +
> +properties:
> +  "#io-channel-cells":
> +    const: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  compatible:
> +    enum:
> +      - allwinner,sun20i-d1-gpadc

compatible is first property

> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +required:
> +  - "#io-channel-cells"
> +  - clocks
> +  - compatible
> +  - interrupts
> +  - reg
> +  - resets

required: block goes after all properties.

> +
> +patternProperties:
> +  "^channel@([0-15])$":
> +    $ref: adc.yaml
> +    type: object
> +    description: |

Do not need '|' unless you need to preserve formatting.

> +      Represents the internal channels of the ADC.
> +
> +    properties:
> +      reg:

> +        description: |
Do not need '|' unless you need to preserve formatting.

> +          The channel number.
> +          Up to 16 channels, numbered from 0 to 15.

Don't repeat constraints in free form text.

> +        items:
> +          minimum: 0
> +          maximum: 15
> +
> +    required:
> +      - reg
> +
> +    additionalProperties: false

Hm? So you do not allow anything from adc.yaml related? Are you sure
this is your intention?

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    gpadc: adc@...9000 {
> +        compatible = "allwinner,sun20i-d1-gpadc";
> +        reg = <0x2009000 0x1000>;
> +        clocks = <&ccu 80>;
> +        resets = <&ccu 32>;
> +        interrupts = <0 57 4>;

Use proper defines

> +        #io-channel-cells = <1>;
> +
> +        channel@0 {
> +          reg = <0>;

Broken indentation.
Use 4 spaces for example indentation.

> +        };
> +
> +        channel@1 {
> +          reg = <1>;
> +        };
> +    };
> +
> +...

Best regards,
Krzysztof