linux-kernel - Re: [PATCH v5 4/4] arm64: dts: qcom: qcs615-ride: Enable PCIe interface

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Message-ID: <51ba2ae0-50fd-4fbe-acc0-3e9f89a75049@quicinc.com>
Date: Wed, 18 Jun 2025 15:01:15 +0800
From: Ziyue Zhang <quic_ziyuzhan@...cinc.com>
To: Manivannan Sadhasivam <mani@...nel.org>
CC: <lpieralisi@...nel.org>, <kwilczynski@...nel.org>,
        <manivannan.sadhasivam@...aro.org>, <robh@...nel.org>,
        <bhelgaas@...gle.com>, <krzk+dt@...nel.org>,
        <neil.armstrong@...aro.org>, <abel.vesa@...aro.org>, <kw@...ux.com>,
        <conor+dt@...nel.org>, <vkoul@...nel.org>, <kishon@...nel.org>,
        <andersson@...nel.org>, <konradybcio@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_qianyu@...cinc.com>,
        <quic_krichai@...cinc.com>, <quic_vbadigan@...cinc.com>,
        Konrad Dybcio
	<konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v5 4/4] arm64: dts: qcom: qcs615-ride: Enable PCIe
 interface


On 6/18/2025 12:33 AM, Manivannan Sadhasivam wrote:
> On Tue, May 27, 2025 at 03:20:36PM +0800, Ziyue Zhang wrote:
>> From: Krishna chaitanya chundru <quic_krichai@...cinc.com>
>>
>> Add platform configurations in devicetree for PCIe, board related
>> gpios, PMIC regulators, etc.
>>
>> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
>> Signed-off-by: Ziyue Zhang <quic_ziyuzhan@...cinc.com>
>> ---
>>   arch/arm64/boot/dts/qcom/qcs615-ride.dts | 42 ++++++++++++++++++++++++
>>   1 file changed, 42 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/qcs615-ride.dts b/arch/arm64/boot/dts/qcom/qcs615-ride.dts
>> index 2b5aa3c66867..c59647e5f2d6 100644
>> --- a/arch/arm64/boot/dts/qcom/qcs615-ride.dts
>> +++ b/arch/arm64/boot/dts/qcom/qcs615-ride.dts
>> @@ -217,6 +217,23 @@ &gcc {
>>   		 <&sleep_clk>;
>>   };
>>   
>> +&pcie {
>> +	perst-gpios = <&tlmm 101 GPIO_ACTIVE_LOW>;
>> +	wake-gpios = <&tlmm 100 GPIO_ACTIVE_HIGH>;
>> +
>> +	pinctrl-0 = <&pcie_default_state>;
>> +	pinctrl-names = "default";
>> +
>> +	status = "okay";
>> +};
>> +
>> +&pcie_phy {
>> +	vdda-phy-supply = <&vreg_l5a>;
>> +	vdda-pll-supply = <&vreg_l12a>;
>> +
>> +	status = "okay";
>> +};
>> +
>>   &pm8150_gpios {
>>   	usb2_en: usb2-en-state {
>>   		pins = "gpio10";
>> @@ -244,6 +261,31 @@ &rpmhcc {
>>   	clocks = <&xo_board_clk>;
>>   };
>>   
>> +&tlmm {
>> +	pcie_default_state: pcie-default-state {
>> +		clkreq-pins {
>> +			pins = "gpio90";
>> +			function = "pcie_clk_req";
>> +			drive-strength = <2>;
>> +			bias-pull-up;
>> +		};
>> +
>> +		perst-pins {
>> +			pins = "gpio101";
>> +			function = "gpio";
>> +			drive-strength = <2>;
>> +			bias-pull-down;
> Are you sure that the default state of the pin should be 'pull down'? Pull down
> of a PERST# is deassert, which should only happen once the power and refclk are
> stable.
>
> - Mani

Hi Mani,

pull-down is assert, we need to make sure perset is asserted before refclk is
stable.

BRs
Ziyue