linux-kernel - Re: [v4 01/15] dt-bindings: iio: adc: Add ast2600-adc bindings

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Date:   Tue, 24 Aug 2021 07:13:04 -0500
From:   Rob Herring <robh@...nel.org>
To:     Billy Tsai <billy_tsai@...eedtech.com>
Cc:     jic23@...nel.org, lars@...afoo.de, pmeerw@...erw.net,
        joel@....id.au, andrew@...id.au, p.zabel@...gutronix.de,
        lgirdwood@...il.com, broonie@...nel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        BMC-SW@...eedtech.com
Subject: Re: [v4 01/15] dt-bindings: iio: adc: Add ast2600-adc bindings

On Mon, Aug 23, 2021 at 03:02:26PM +0800, Billy Tsai wrote:
> Add device tree bindings document for the aspeed ast2600 adc device
> driver.
> 
> Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
> ---
>  .../bindings/iio/adc/aspeed,ast2600-adc.yaml  | 97 +++++++++++++++++++
>  1 file changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml b/Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml
> new file mode 100644
> index 000000000000..248cda7d91e9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/aspeed,ast2600-adc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ADC that forms part of an ASPEED server management processor.
> +
> +maintainers:
> +  - Billy Tsai <billy_tsai@...eedtech.com>
> +
> +description: |
> +  • 10-bits resolution for 16 voltage channels.
> +  • The device split into two individual engine and each contains 8 voltage
> +  channels.
> +  • Channel scanning can be non-continuous.
> +  • Programmable ADC clock frequency.
> +  • Programmable upper and lower threshold for each channels.
> +  • Interrupt when larger or less than threshold for each channels.
> +  • Support hysteresis for each channels.
> +  • Built-in a compensating method.
> +  • Built-in a register to trim internal reference voltage.
> +  • Internal or External reference voltage.
> +  • Support 2 Internal reference voltage 1.2v or 2.5v.
> +  • Integrate dividing circuit for battery sensing.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - aspeed,ast2600-adc0
> +      - aspeed,ast2600-adc1

What's the difference between 0 and 1?

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      Input clock used to derive the sample clock. Expected to be the
> +      SoC's APB clock.

How many clocks?

> +
> +  resets:
> +    maxItems: 1
> +
> +  "#io-channel-cells":
> +    const: 1
> +
> +  vref-supply:
> +    description:
> +      The external regulator supply ADC reference voltage.
> +
> +  aspeed,int_vref_mv:

Don't use '_' in property names.

Use standard unit suffixes as defined in property-units.yaml.

> +    $ref: /schemas/types.yaml#/definitions/uint32

And then you can drop this.

> +    enum: [1200, 2500]
> +    description:
> +      ADC internal reference voltage in millivolts.
> +
> +  aspeed,battery-sensing:
> +    type: boolean
> +    description:
> +      Inform the driver that last channel will be used to sensor battery.
> +
> +  aspeed,trim-data-valid:
> +    type: boolean
> +    description: |
> +      The ADC reference voltage can be calibrated to obtain the trimming
> +      data which will be stored in otp. This property informs the driver that
> +      the data store in the otp is valid.
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - resets
> +  - "#io-channel-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/ast2600-clock.h>
> +    adc0: adc@...e9000 {
> +        compatible = "aspeed,ast2600-adc0";
> +        reg = <0x1e6e9000 0x100>;
> +        clocks = <&syscon ASPEED_CLK_APB2>;
> +        resets = <&syscon ASPEED_RESET_ADC>;
> +        #io-channel-cells = <1>;
> +        aspeed,int_vref_mv = <2500>;
> +    };
> +    adc1: adc@...e9100 {
> +        compatible = "aspeed,ast2600-adc1";
> +        reg = <0x1e6e9100 0x100>;
> +        clocks = <&syscon ASPEED_CLK_APB2>;
> +        resets = <&syscon ASPEED_RESET_ADC>;
> +        #io-channel-cells = <1>;
> +        aspeed,int_vref_mv = <2500>;
> +    };
> +...
> -- 
> 2.25.1
> 
>