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

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Date:   Thu, 29 Sep 2022 10:59:09 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
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 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?

>
> 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
>


-- 
With best wishes
Dmitry