linux-kernel - Re: [PATCH 1/3] iio: adc: Convert the QCOM SPMI ADC bindings to .yaml format

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Date:   Mon, 6 Apr 2020 17:11:56 +0530
From:   Jishnu Prakash <jprakash@...eaurora.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        mka@...omium.org, linus.walleij@...aro.org, sboyd@...eaurora.org,
        Jonathan.Cameron@...wei.com, smohanad@...eaurora.org,
        kgunda@...eaurora.org, aghayal@...eaurora.org,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        Andy Gross <andy.gross@...aro.org>, linux-iio@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH 1/3] iio: adc: Convert the QCOM SPMI ADC bindings to .yaml
 format

Hi Jonathan,

On 3/28/2020 10:21 PM, Jonathan Cameron wrote:
> On Tue, 24 Mar 2020 21:14:08 +0530
> Jishnu Prakash <jprakash@...eaurora.org> wrote:
>
>> Convert the adc bindings from .txt to .yaml format.
>>
>> Signed-off-by: Jishnu Prakash <jprakash@...eaurora.org>
> Hi Jishnu,
>
> Looks to me like we can tighten the checks a fair bit in here rather
> than just using uint32s
>
> Now, my yaml isn't great so I won't try to say how, but there are plenty
> of examples in tree.
>
> Thanks,
>
> Jonathan
>
> +
> +      qcom,decimation:
> +        description: |
> +            This parameter is used to decrease ADC sampling rate.
> +            Quicker measurements can be made by reducing decimation ratio.
> +            - For compatible property "qcom,spmi-vadc", valid values are
> +              512, 1024, 2048, 4096. If property is not found, default value
> +              of 512 will be used.
> +            - For compatible property "qcom,spmi-adc5", valid values are 250, 420
> +              and 840. If property is not found, default value of 840 is used.
> +            - For compatible property "qcom,spmi-adc-rev2", valid values are 256,
> +              512 and 1024. If property is not present, default value is 1024.
> +        allOf:
> +          - $ref: /schemas/types.yaml#/definitions/uint32
> Should ideally verify all the values against models etc rather than a uint32 binding.
I'll add constraints for all properties for which it's applicable in the 
next post.
>
>> +
>> +      qcom,pre-scaling:
>> +        description: |
>> +            Used for scaling the channel input signal before the signal is
>> +            fed to VADC. The configuration for this node is to know the
>> +            pre-determined ratio and use it for post scaling. Select one from
>> +            the following options.
>> +            <1 1>, <1 3>, <1 4>, <1 6>, <1 20>, <1 8>, <10 81>, <1 10>
>

>> +
>> +examples:
>> +  - |
>> +      /* VADC node */
>> +      pmic_vadc: vadc@...0 {
> Should really be using generic names, so adc@...0 preferred.
I'll change it in the next post.