linux-kernel - Re: [PATCH 1/4] dt-bindings: phy: qcom,snps-eusb2-repeater: Add magic tuning overrides

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Message-ID: <4a6238f0-5c91-4fd9-9e02-38766778e2a4@linaro.org>
Date:   Wed, 6 Sep 2023 09:28:13 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Abel Vesa <abel.vesa@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: phy: qcom,snps-eusb2-repeater: Add magic
 tuning overrides

On 5.09.2023 18:38, Rob Herring wrote:
> On Wed, Aug 30, 2023 at 04:40:15AM +0200, Konrad Dybcio wrote:
>> The EUSB2 repeater requires some alterations to its init sequence,
>> depending on board design.
>>
>> Add support for making the necessary changes to that sequence to make USB
>> functional on SM8550-based Xperia 1 V.
>>
>> They all have lackluster description due to lack of information.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  .../bindings/phy/qcom,snps-eusb2-repeater.yaml      | 21 +++++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
>> index 029569d5fcf3..83fd6f936bf9 100644
>> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
>> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
>> @@ -32,6 +32,27 @@ properties:
>>  
>>    vdd3-supply: true
>>  
>> +  qcom,tune-hsdisc-value:
> 
> Is '-value' redundant?
> 
> '-thres' or '-threshold' would be more descriptive.
All these names are essentially qcom,register-name-value

But I do see your point, it probably makes sense to make it
more human-readable.

> 
>> +    $ref: /schemas/types.yaml#/definitions/uint8
>> +    description: High-Speed disconnect threshold
>> +    minimum: 0
>> +    maximum: 7
>> +    default: 0
>> +
>> +  qcom,tune-iusb2-value:
> 
> -amplitude?
ack

> 
>> +    $ref: /schemas/types.yaml#/definitions/uint8
>> +    description: High-Speed trasmit amplitude
transmit*

>> +    minimum: 0
>> +    maximum: 15
>> +    default: 8
>> +
>> +  qcom,tune-usb2-preem-value:
> 
> We have 'hs', 'iusb2', and 'usb2'. Can you be consistent?
Again, this is taken from register names. I can use 'usb2'
everywhere if you wish.

Konrad