linux-kernel - Re: [PATCH v4 6/6] arm64: dts: qcom: x1e80100: Add support for PCIe3 on x1e80100

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Message-ID: <ee32742d-9daf-4bff-948b-cf2e705bc73f@quicinc.com>
Date: Wed, 25 Sep 2024 14:37:41 +0800
From: Qiang Yu <quic_qianyu@...cinc.com>
To: Johan Hovold <johan@...nel.org>
CC: <manivannan.sadhasivam@...aro.org>, <vkoul@...nel.org>,
        <kishon@...nel.org>, <robh@...nel.org>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <mturquette@...libre.com>, <sboyd@...nel.org>, <abel.vesa@...aro.org>,
        <quic_msarkar@...cinc.com>, <quic_devipriy@...cinc.com>,
        <dmitry.baryshkov@...aro.org>, <kw@...ux.com>, <lpieralisi@...nel.org>,
        <neil.armstrong@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v4 6/6] arm64: dts: qcom: x1e80100: Add support for PCIe3
 on x1e80100


On 9/24/2024 10:43 PM, Johan Hovold wrote:
> On Tue, Sep 24, 2024 at 03:14:44AM -0700, Qiang Yu wrote:
>> Describe PCIe3 controller and PHY. Also add required system resources like
>> regulators, clocks, interrupts and registers configuration for PCIe3.
>> @@ -2907,6 +2907,208 @@ mmss_noc: interconnect@...0000 {
>>   			#interconnect-cells = <2>;
>>   		};
>>   
>> +		pcie3: pcie@...0000 {
>> +			device_type = "pci";
>> +			compatible = "qcom,pcie-x1e80100";
>> +			interrupts = <GIC_SPI 158 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 769 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 836 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 671 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 200 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 218 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 121 IRQ_TYPE_LEVEL_HIGH>;
>> +			interrupt-names = "msi0",
>> +					  "msi1",
>> +					  "msi2",
>> +					  "msi3",
>> +					  "msi4",
>> +					  "msi5",
>> +					  "msi6",
>> +					  "msi7",
>> +					  "global";
> This ninth "global" interrupt is not described by the bindings, which
> would also need to be updated. What is it used for?

As of now, the global interrupts is mainly used to get link up event so
that the device driver can enumerate the PCIe endpoint devices without
user intervention. You can refer to
https://lore.kernel.org/linux-pci/20240828-pci-qcom-hotplug-v4-11-263a385fbbcb@linaro.org.

I see this global interrupts has been documented in qcom,pcie-sm8450.yaml.
Do I need to move it to qcom,pcie-common.yaml?

Thanks,
Qiang
>
> Johan