linux-kernel - Re: [PATCH v6 2/2] arm64: dts: qcom: ipq5424: Enable PCIe PHYs and controllers

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Message-ID: <5de57d38-4cc3-44ab-87c4-cdd99911d343@oss.qualcomm.com>
Date: Thu, 3 Apr 2025 22:49:11 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
Cc: andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_varada@...cinc.com, quic_srichara@...cinc.com
Subject: Re: [PATCH v6 2/2] arm64: dts: qcom: ipq5424: Enable PCIe PHYs and
 controllers

On 4/3/25 11:32 AM, Dmitry Baryshkov wrote:
> On Thu, 3 Apr 2025 at 08:08, Manikanta Mylavarapu
> <quic_mmanikan@...cinc.com> wrote:
>>
>>
>>
>> On 4/2/2025 7:50 PM, Dmitry Baryshkov wrote:
>>> On Wed, Apr 02, 2025 at 03:57:23PM +0530, Manikanta Mylavarapu wrote:
>>>> Enable the PCIe controller and PHY nodes corresponding to RDP466.
>>>>
>>>> Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
>>>> ---
>>>> Changes in V6:
>>>>      - No change.
>>>>
>>>>  arch/arm64/boot/dts/qcom/ipq5424-rdp466.dts | 41 ++++++++++++++++++++-
>>>>  1 file changed, 40 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/ipq5424-rdp466.dts b/arch/arm64/boot/dts/qcom/ipq5424-rdp466.dts
>>>> index 0fd0ebe0251d..1f89530cb035 100644
>>>> --- a/arch/arm64/boot/dts/qcom/ipq5424-rdp466.dts
>>>> +++ b/arch/arm64/boot/dts/qcom/ipq5424-rdp466.dts
>>>> @@ -82,6 +82,32 @@ &dwc_1 {
>>>>      dr_mode = "host";
>>>>  };
>>>>
>>>> +&pcie2 {
>>>> +    pinctrl-0 = <&pcie2_default_state>;
>>>> +    pinctrl-names = "default";
>>>> +
>>>> +    perst-gpios = <&tlmm 31 GPIO_ACTIVE_LOW>;
>>>
>>>
>>> No wake-gpios? Please document it in the commit message.
>>>
>>
>> Hi Dmitry,
>>
>> Thank you for reviewing the patch.
>>
>> The wake GPIO is dropped because the PCIe on the IPQ5424 doesn't support low power mode.
>> I will document this information in the commit message and post the next version.
> 
> If the GPIO is routed on the PCB I think it should still be described in the DT.

Even basic s2idle can be woken up from, please describe it.

Konrad