linux-kernel - Re: [PATCH V3 5/6] arm64: dts: qcom: ipq9574: Enable PCIe PHYs and controllers

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Date:   Mon, 8 May 2023 16:25:10 +0530
From:   Devi Priya <quic_devipriy@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <lpieralisi@...nel.org>,
        <kw@...ux.com>, <robh@...nel.org>, <bhelgaas@...gle.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <mturquette@...libre.com>,
        <sboyd@...nel.org>, <mani@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <quic_srichara@...cinc.com>,
        <quic_sjaganat@...cinc.com>, <quic_kathirav@...cinc.com>,
        <quic_arajkuma@...cinc.com>, <quic_anusha@...cinc.com>,
        <quic_ipkumar@...cinc.com>
Subject: Re: [PATCH V3 5/6] arm64: dts: qcom: ipq9574: Enable PCIe PHYs and
 controllers



On 4/22/2023 5:43 AM, Dmitry Baryshkov wrote:
> On Fri, 21 Apr 2023 at 15:51, Devi Priya <quic_devipriy@...cinc.com> wrote:
>>
>> Enable the PCIe controller and PHY nodes corresponding to
>> RDP 433.
>>
>> Signed-off-by: Devi Priya <quic_devipriy@...cinc.com>
>> ---
>>   Changes in V3:
>>          - No change
>>
>>   arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts | 62 +++++++++++++++++++++
>>   1 file changed, 62 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts b/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
>> index 7be578017bf7..3ae38cf327ea 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
>> +++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp433.dts
>> @@ -8,6 +8,7 @@
>>
>>   /dts-v1/;
>>
>> +#include <dt-bindings/gpio/gpio.h>
>>   #include "ipq9574.dtsi"
>>
>>   / {
>> @@ -43,6 +44,42 @@
>>          };
>>   };
>>
>> +&pcie1_phy {
>> +       status = "okay";
>> +};
>> +
>> +&pcie1 {
>> +       pinctrl-names = "default";
>> +       pinctrl-0 = <&pcie_1_pin>;
>> +
>> +       perst-gpios = <&tlmm 26 GPIO_ACTIVE_LOW>;
> 
> Usually qcom PCIe hosts also define wake-gpios.
In IPQ9574, we do not have hot plug support and host always starts the
enumeration for the device. Hence no wake pin is required.
> 
>> +       status = "okay";
>> +};
>> +
>> +&pcie2_phy {
>> +       status = "okay";
>> +};
>> +
>> +&pcie2 {
>> +       pinctrl-names = "default";
>> +       pinctrl-0 = <&pcie_2_pin>;
>> +
>> +       perst-gpios = <&tlmm 29 GPIO_ACTIVE_LOW>;
>> +       status = "okay";
>> +};
>> +
>> +&pcie3_phy {
>> +       status = "okay";
>> +};
>> +
>> +&pcie3 {
>> +       pinctrl-names = "default";
>> +       pinctrl-0 = <&pcie_3_pin>;
>> +
>> +       perst-gpios = <&tlmm 32 GPIO_ACTIVE_LOW>;
>> +       status = "okay";
>> +};
>> +
>>   &sdhc_1 {
>>          pinctrl-0 = <&sdc_default_state>;
>>          pinctrl-names = "default";
>> @@ -60,6 +97,31 @@
>>   };
>>
>>   &tlmm {
>> +
>> +       pcie_1_pin: pcie-1-state {
>> +               pins = "gpio26";
>> +               function = "gpio";
>> +               drive-strength = <8>;
>> +               bias-pull-down;
>> +               output-low;
> 
> No clkreq and no wake gpios?
We do not use any PCIe low power states and link is always in L0.

Thanks,
Devi Priya
> 
>> +       };
>> +
>> +       pcie_2_pin: pcie-2-state {
>> +               pins = "gpio29";
>> +               function = "gpio";
>> +               drive-strength = <8>;
>> +               bias-pull-down;
>> +               output-low;
>> +       };
>> +
>> +       pcie_3_pin: pcie-3-state {
>> +               pins = "gpio32";
>> +               function = "gpio";
>> +               drive-strength = <8>;
>> +               bias-pull-up;
>> +               output-low;
>> +       };
>> +
>>          sdc_default_state: sdc-default-state {
>>                  clk-pins {
>>                          pins = "gpio5";
>> --
>> 2.17.1
>>
> 
>