linux-kernel - Re: [PATCH v6 4/4] arm64: dts: qcom: sa8775p: Add ep pcie0 controller node

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Message-ID: <3c96e4c7-361a-86e7-3590-254f17f71efe@quicinc.com>
Date:   Wed, 1 Nov 2023 11:58:03 +0530
From:   Mrinmay Sarkar <quic_msarkar@...cinc.com>
To:     Manivannan Sadhasivam <mani@...nel.org>
CC:     <agross@...nel.org>, <andersson@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <konrad.dybcio@...aro.org>, <quic_shazhuss@...cinc.com>,
        <quic_nitegupt@...cinc.com>, <quic_ramkri@...cinc.com>,
        <quic_nayiluri@...cinc.com>, <dmitry.baryshkov@...aro.org>,
        <robh@...nel.org>, <quic_krichai@...cinc.com>,
        <quic_vbadigan@...cinc.com>, <quic_parass@...cinc.com>,
        <quic_schintav@...cinc.com>, <quic_shijose@...cinc.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo Pieralisi" <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        <linux-pci@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <mhi@...ts.linux.dev>
Subject: Re: [PATCH v6 4/4] arm64: dts: qcom: sa8775p: Add ep pcie0 controller
 node


On 11/1/2023 10:56 AM, Manivannan Sadhasivam wrote:
> On Tue, Oct 31, 2023 at 10:41:48AM +0530, Mrinmay Sarkar wrote:
>> Add ep pcie dtsi node for pcie0 controller found on sa8775p platform.
>> It supports gen4 and x2 link width. Limiting the speed to Gen3 due to
>> stability issues.
>>
>> Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
>
> One question below:
>
>> ---
>>   arch/arm64/boot/dts/qcom/sa8775p.dtsi | 46 +++++++++++++++++++++++++++++++++++
>>   1 file changed, 46 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> index 13dd44d..7eab458 100644
>> --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> @@ -3586,6 +3586,52 @@
>>   		status = "disabled";
>>   	};
>>   
>> +	pcie0_ep: pcie-ep@...0000 {
>> +		compatible = "qcom,sa8775p-pcie-ep";
>> +		reg = <0x0 0x01c00000 0x0 0x3000>,
>> +		      <0x0 0x40000000 0x0 0xf20>,
>> +		      <0x0 0x40000f20 0x0 0xa8>,
>> +		      <0x0 0x40001000 0x0 0x4000>,
>> +		      <0x0 0x40200000 0x0 0x100000>,
>> +		      <0x0 0x01c03000 0x0 0x1000>,
>> +		      <0x0 0x40005000 0x0 0x2000>;
>> +		reg-names = "parf", "dbi", "elbi", "atu", "addr_space",
>> +			    "mmio", "dma";
>> +
>> +		clocks = <&gcc GCC_PCIE_0_AUX_CLK>,
>> +			<&gcc GCC_PCIE_0_CFG_AHB_CLK>,
>> +			<&gcc GCC_PCIE_0_MSTR_AXI_CLK>,
>> +			<&gcc GCC_PCIE_0_SLV_AXI_CLK>,
>> +			<&gcc GCC_PCIE_0_SLV_Q2A_AXI_CLK>;
>> +
>> +		clock-names = "aux",
>> +			      "cfg",
>> +			      "bus_master",
>> +			      "bus_slave",
>> +			      "slave_q2a";
>> +
>> +		interrupts = <GIC_SPI 306 IRQ_TYPE_LEVEL_HIGH>,
>> +			     <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
>> +			     <GIC_SPI 630 IRQ_TYPE_LEVEL_HIGH>;
>> +
>> +		interrupt-names = "global", "doorbell", "dma";
>> +
>> +		interconnects = <&pcie_anoc MASTER_PCIE_0 0 &mc_virt SLAVE_EBI1 0>,
>> +				<&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_PCIE_0 0>;
>> +		interconnect-names = "pcie-mem", "cpu-pcie";
>> +
>> +		iommus = <&pcie_smmu 0x0000 0x7f>;
> SID is really 0?
>
> - Mani
Yes Mani, SA877P has SID 0x0 for pcie 0 controller and 0x80 for pcie 1 
controller.
> --Mrinmay
>
>> +		resets = <&gcc GCC_PCIE_0_BCR>;
>> +		reset-names = "core";
>> +		power-domains = <&gcc PCIE_0_GDSC>;
>> +		phys = <&pcie0_phy>;
>> +		phy-names = "pciephy";
>> +		max-link-speed = <3>; /* FIXME: Limiting the Gen speed due to stability issues */
>> +		num-lanes = <2>;
>> +
>> +		status = "disabled";
>> +	};
>> +
>>   	pcie0_phy: phy@...4000 {
>>   		compatible = "qcom,sa8775p-qmp-gen4x2-pcie-phy";
>>   		reg = <0x0 0x1c04000 0x0 0x2000>;
>> -- 
>> 2.7.4
>>