linux-kernel - Re: [PATCH v1 1/3] arm64: defconfig: enable PCI Power Control for PCIe3

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Message-ID: <fbd5c153-b73a-4dbc-a923-4e3d3924e748@kernel.org>
Date: Mon, 24 Mar 2025 08:38:34 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "Wenbin Yao (Consultant)" <quic_wenbyao@...cinc.com>,
 Bartosz Golaszewski <brgl@...ev.pl>
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,
 catalin.marinas@....com, will@...nel.org, quic_qianyu@...cinc.com,
 sfr@...b.auug.org.au, linux-arm-kernel@...ts.infradead.org,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v1 1/3] arm64: defconfig: enable PCI Power Control for
 PCIe3

On 24/03/2025 08:09, Wenbin Yao (Consultant) wrote:
> On 3/21/2025 5:43 PM, Bartosz Golaszewski wrote:
>> On Fri, Mar 21, 2025 at 8:37 AM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>>> On 20/03/2025 06:55, Wenbin Yao wrote:
>>>> From: Qiang Yu <quic_qianyu@...cinc.com>
>>>>
>>>> Enable the pwrctrl driver, which is utilized to manage the power supplies
>>>> of the devices connected to the PCI slots. This ensures that the voltage
>>>> rails of the x8 PCI slots on the X1E80100 - QCP can be correctly turned
>>>> on/off if they are described under PCIe port device tree node.
>>>>
>>>> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
>>>> Signed-off-by: Wenbin Yao <quic_wenbyao@...cinc.com>
>>>> ---
>>>>   arch/arm64/configs/defconfig | 1 +
>>>>   1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
>>>> index 85ec2fba1..de86d1121 100644
>>>> --- a/arch/arm64/configs/defconfig
>>>> +++ b/arch/arm64/configs/defconfig
>>>> @@ -245,6 +245,7 @@ CONFIG_PCIE_LAYERSCAPE_GEN4=y
>>>>   CONFIG_PCI_ENDPOINT=y
>>>>   CONFIG_PCI_ENDPOINT_CONFIGFS=y
>>>>   CONFIG_PCI_EPF_TEST=m
>>>> +CONFIG_PCI_PWRCTL_SLOT=y
>>> Bartosz,
>>>
>>> Wasn't the intention to select it the same way as PCI_PWRCTL_PWRSEQ is
>>> selected?
>>>
>>> Best regards,
>>> Krzysztof
>>>
>> For sure. I would expect there to be something like:
>>
>> select PCI_PWRCTL_SLOT if ARCH_QCOM
>>
>> in Kconfig and nothing in defconfig.
>>
>> Bartosz
> 
> IIUC, pci slot power driver is a common driver that could be used by all DT
> based platform.


You are not responding to the raised problem.

Best regards,
Krzysztof