linux-kernel - Re: [PATCH v3 3/3] dt-bindings: i2c: qcom,i2c-qup: Document noise rejection properties

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Message-ID: <8091e7fb-5530-10c2-c66c-ac76940ef1ad@somainline.org>
Date:   Thu, 28 Jan 2021 22:23:15 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     Wolfram Sang <wsa@...nel.org>
Cc:     agross@...nel.org, linux-kernel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, bjorn.andersson@...aro.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-i2c@...r.kernel.org,
        phone-devel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] dt-bindings: i2c: qcom,i2c-qup: Document noise
 rejection properties

Il 28/01/21 10:13, Wolfram Sang ha scritto:
> 
>> +  qcom,noise-reject-sda:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: Noise rejection level for the SDA line.
>> +    minimum: 0
>> +    maximum: 3
>> +    default: 0
> 
> What does this u32 describe? I wonder if we can introduce a generic
> property instead of a vendor-specific one.
> 

Describes a "noise rejection level"... zero is disabled, 1-2-3 are
min-med-high. That's what the hardware accepts.

Also, there's no "real" documentation on this, so it wasn't possible
to map it to any real measurement unit as well...