linux-kernel - Re: [PATCH 1/4] arm64: dts: qcom: x1e80100: Add PCIe lane equalization preset properties

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Message-ID: <5648484f-38f2-4c75-b8a3-7a0148dc940b@oss.qualcomm.com>
Date: Sat, 16 Nov 2024 12:19:49 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        quic_mrana@...cinc.com, quic_vbadigan@...cinc.com, kernel@...cinc.com,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/4] arm64: dts: qcom: x1e80100: Add PCIe lane
 equalization preset properties

On 16.11.2024 2:37 AM, Krishna chaitanya chundru wrote:
> Add PCIe lane equalization preset properties for 8 GT/s and 16 GT/s data
> rates used in lane equalization procedure.
> 
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/x1e80100.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> index a36076e3c56b..6a2074297030 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> +++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> @@ -2993,6 +2993,10 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
>  			phys = <&pcie6a_phy>;
>  			phy-names = "pciephy";
>  
> +			eq-presets-8gts = /bits/ 16 <0x5555 0x5555>;

If we make all of these presets u8 arrays, we can use the:

property = [0xff 0xff 0xff 0xff];

syntax

Konrad