linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7280: Update SNPS Phy params for SC7280

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Message-ID: <0cc382cb-b76e-a5a5-3480-47a451bdc958@quicinc.com>
Date:   Thu, 29 Sep 2022 14:24:23 +0530
From:   Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc7280: Update SNPS Phy params for
 SC7280


On 9/29/2022 1:29 PM, Dmitry Baryshkov wrote:
> On Thu, 29 Sept 2022 at 10:14, Krishna Kurapati
> <quic_kriskura@...cinc.com> wrote:
>>
>> Override the SNPS Phy tuning parameters for SC7280 devices. These
>> values are common for both trogdor and herobrine variants.
> 
> They are common for trogdor and herobrine, but should these parameters
> be a default? In other words, a random new device based on sc7280
> would more likely use these overrides or the hardware defaults?
> 
Hi Dmitry,

   Currently there are only two platforms, so I made these changes on 
common dtsi. If a new platform comes (mostly it won't) we can override 
them in platform specific file is what I thought.

Regards,
Krishna,
>>
>> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
>> ---
>>   arch/arm64/boot/dts/qcom/sc7280.dtsi | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> index 2125803..ae2c23e 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> @@ -3310,6 +3310,13 @@
>>                          clock-names = "ref";
>>
>>                          resets = <&gcc GCC_QUSB2PHY_SEC_BCR>;
>> +
>> +                       qcom,hs-rise-fall-time-bp = <0>;
>> +                       qcom,squelch-detector-bp = <(-2090)>;
>> +                       qcom,hs-disconnect-bp = <1743>;
>> +                       qcom,hs-amplitude-bp = <1780>;
>> +                       qcom,hs-crossover-voltage-microvolt = <(-31000)>;
>> +                       qcom,hs-output-impedance-micro-ohms = <2600000>;
>>                  };
>>
>>                  usb_1_qmpphy: phy-wrapper@...9000 {
>> --
>> 2.7.4
>>
> 
>