Re: [RFC PATCH v1 2/4] dt-bindings: iio: adc: Add Allwinner D1/T113s/R329 SoCs GPADC

[Jonathan Cameron <jic23@xxxxxxxxxx>]

On Wed, 24 May 2023 11:27:31 +0300
Maxim Kiselev <bigunclemax@xxxxxxxxx> wrote:

> Allwinner's D1, T113s and R329 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.
> 
> Signed-off-by: Maxim Kiselev <bigunclemax@xxxxxxxxx>
> ---
>  .../iio/adc/allwinner,sun20i-d1-gpadc.yaml    | 52 +++++++++++++++++++
>  1 file changed, 52 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..a79b874750dd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%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: 0

That's odd for a device with more than one channel.  How do you reference
which channel you want to consume?

> +
> +  clocks:
> +    maxItems: 1
> +
> +  compatible:
> +    enum:
> +      - allwinner,sun20i-d1-gpadc
> +      - allwinner,sun8i-t113-gpadc
> +      - allwinner,sun50i-r329-gpadc
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +required:
> +  - "#io-channel-cells"
> +  - clocks
> +  - compatible
> +  - interrupts
> +  - reg
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    gpadc: adc@2009000 {
> +        compatible = "allwinner,sun20i-d1-gpadc";
> +        reg = <0x2009000 0x1000>;
> +        clocks = <&ccu CLK_BUS_GPADC>;
> +        resets = <&ccu RST_BUS_GPADC>;
> +        interrupts = <SOC_PERIPHERAL_IRQ(57) IRQ_TYPE_LEVEL_HIGH>;

I guess the bot probably got this, but to use these macros you need some includes.

> +        #io-channel-cells = <0>;
> +    };
> +
> +...